Photosynthesis and Growth of Copaiba Seedlings Subjected to Soil Flooding

ABSTRACT

The present study aimed to evaluate the effects of soil flooding on photosynthesis, growth, and biomass partitioning of young plants of copaiba (Copaifera lucens Dwyer, Fabaceae ) to investigate the possibility of using this species in restoration projects of riparian forests. Based on our results, we concluded that young plants of C. lucens are able to tolerate soil flooding for a period of approximately one month, despite significant decreases in the growth rate of roots, stomatal conductance to water vapor, and the net photosynthetic rate. These results indicate the possibility of including C. lucens in restoration programs for degraded riparian forests in regions where this species naturally occurs.

Key-words: Copaifera lucens; stomatal conductance; net photosynthetic rate; relative growth rate

1. INTRODUCTION

Riparian forests have great environmental importance, acting as ecological corridors in the stabilization of water flow in streams and rivers, and the protection of public supply reservoirs ( Tundisi & Tundisi, 2010 ). However, most riparian forests in environments of the Brazilian Atlantic Rainforest are in an advanced state of degradation ( Moraes et al., 2012 ). The degradation process of riparian forests has resulted in several environmental problems, including the extinction of fauna and flora species, local climate changes, soil erosion, and eutrophication of watercourses ( Ferreira & Dias, 2004 ). Due to their importance and the current state of degradation of riparian forests in the Brazilian Atlantic Rainforest, initiatives have arisen for restoring these ecosystems. However, due to the oscillation of water levels in rivers, lakes, and reservoirs, local riparian forests are difficult to reforest because these water level variations create extreme conditions caused by the seasonal or eventual flooding of the soil ( Lobo & Joly, 2000 ; Kozlowski, 2002 ).

Random events, such as flooding caused by excessive rainfall, can lead to total or partial flooding of plants in riparian forest environments. During total flooding, there is complete submersion of individual plants, which causes damage to roots, and changes in the photosynthetic rate and fall of leaves ( Gonçalves et al., 2012 ; Parolin, 2012 ; Maxwell et al., 2016 ). Thus, soil flooding may cause damage to the roots and visible but indirect changes in the aerial plant parts ( Mielke et al., 2003 ; Medri et al., 2007 ; Oliveira & Joly, 2010 ). Although situations of occasional total flooding might cause more deleterious effects ( Gonçalves et al., 2012 ), the complete submersion of seedlings usually persists for only a few days. Inversely, soil flooding can persist for days or weeks, depending on the flood intensity and soil drainage capacity. In addition, fully submerged plants are also subject to soil flooding.

Floods eliminate the air spaces in the soil, which limits the gas exchange between the soil and atmosphere, and within few hours the roots and microorganisms consume the oxygen present in the water, creating a hypoxic or anoxic environment ( Kozlowski, 2002 ; Kozlowski & Pallardy, 2002 ). Plant responses to soil flooding may include premature foliar senescence, decreased root and shoot volume, adventitious root formation, aerenchyma and hypertrophic lenticels, as well as decreases in stomatal conductance and net photosynthetic rate ( Kozlowski, 2002 ; Kozlowski & Pallardy, 2002 ; Mielke et al., 2003 ; Medri et al., 2007 ; Mielke & Schaffer, 2010 ; Oliveira & Joly, 2010 ; Santos et al., 2012 ; Gonçalves et al., 2012 ; Lira et al., 2013 ; Gonçalves et al., 2013 ; Herrera, 2013 ). Young plants tend to be more vulnerable than adult plants to the stresses imposed by floods ( Maxwell et al., 2016 ).

In general, high survival and growth rates of plants subjected to soil flooding are related to the formation of lenticels and aerenchyma, and the ability of the plants to maintain stomatal conductance and net photosynthetic rates at levels that allow survival and growth when the roots are under limited oxygen availability ( Lopez & Kursar, 1999 ; Mielke et al., 2003 ; Medina et al., 2009 ; Oliveira & Joly, 2010 ; Li et al., 2015 ).

According to the aforementioned, biochemical, physiological, anatomical, and morphological responses of different species when subjected to soil flooding conditions are an important strategy for planning and analysis of procedures adopted in restoration projects of degraded riparian forests ( Mielke et al., 2003 ; Medri et al., 2007 ; Mielke & Schaffer, 2010 ; Lira et al., 2013 ; Li et al., 2015 ).

Species of the genus Copaifera produce economically profitable medicinal oil and are adapted to a wide variety of environments. Species occur in Terra Firme forests, wetlands, lakesides, and Igarapés in the Amazon Basin and the Cerrado forests of Central Brazil ( Rigamonte-Azevedo et al., 2004 ). In the Brazilian Atlantic Forest, Copaifera species are found in ombrophilous and semi-deciduous forests, and in primary, secondary, and riparian forest ( Sambuichi, 2009 ). In an earlier study, Vidal et al. (2014) verified that C. lucens seeds are partially tolerant to submersion in water and are a promising species to utilize in the direct sowing technique in ciliary forest restoration projects. Despite this, there have been no studies previously published in the literature on the effects of partial flooding, or soil flooding, on the physiological performance and growth of C. lucens.

The present study aimed to evaluate the effects of soil flooding on photosynthesis, growth, and biomass partitioning of young plants of C. lucens, with the aim to analyze the possibility of using this species in restoration projects of degraded riparian forests.

2. MATERIAL AND METHODS

The experiment was undertaken in a nursery at the Plant Physiology Laboratory of the State University of Santa Cruz (Universidade Estadual de Santa Cruz - UESC), Ilhéus, Bahia, Brazil. Seeds were collected from the Terra Vista Settlement, Arataca, Bahia, Brazil, in August 2010 by technicians of the UESC's herbarium (HUESC). After collection, the seeds were sterilized and sowed in litter boxes containing washed and autoclaved sand. 62 days after sowing, the seedlings were transferred to 100×200mm polyethylene plastic bags containing forest soil, which were transported to the nursery. 40 days after transplantation, 30 plants were selected, which were conditioned in 100×260mm PVC pipes, with a lid at the lower end and containing approximately 20mm of gravel. Two holes were made in the PVC pipe lids, one on each side, to drain the irrigation water. Nine days after plant selection and conditioning in the PVC pipes, basic phosphate fertilization (700g of P₂O₅ per m³ of substrate) was added. Phosphorus was applied together with nitrogen and potassium (40g of nitrogen and 40g of K₂O per 100 sachets) with an interval of 14 days between each fertilization, which was always carried out at the end of the afternoon. The fertilizers used were monoammonium phosphate and potassium nitrate. Fertilizers were applied to avoid the possibility of an additional stress that could interfere in the physiological performance of the plants during the experiment. At the commencement of flooding, the plants were six months old and approximately 20cm high. Flooding was achieved by capping the two side holes of the lower end of the PVC pipes and filling them with water to 20mm above ground level for a period of 39 days. This period was chosen because it is longer than the floods that occasionally occur in riparian forest environments. The control plants were irrigated daily during the entire experimental period.

At the beginning of the flood, the dry mass of roots (RDM), stems (SDM), leaves (LDM), and total (TDM) were evaluated in 10 plants, in addition to the total leaf area per plant (LA). The plant material was placed individually in paper bags, properly identified, and dried in a forced ventilation oven at 75 °C until constant mass, for 72h. The leaf area (LA) was obtained using an automatic leaf area meter LI-3100 (Li-Cor, EUA).

The presence of lenticels in flooded plants was evaluated at 16 and 37 days after flooding began using an index ranging from 0 to 3, where 0 indicated no lenticels, 1 indicated a few visible lenticels, 2 indicated some visible lenticels, and 3 indicated many visible lenticels.

At 37 days after flooding, the net photosynthetic rate (A) and stomatal conductance to water vapor (gs) were evaluated using a portable photosynthesis meter model Li-6400 (Li-Cor, USA), equipped with an artificial light source 6400-02B RedBlue, programmed to provide 1,200µmol photons m^-2 s^-1. During the measurements, the leaf temperature was maintained at 30±1 °C, the air relative humidity was approximately 60±0.4%, and the ambient CO₂ concentration was approximately 387±3μmol mol^-1. Measurements were taken between 8 am and 10 am, using the apical leaflet of a mature leaf that was completely expanded per plant, in 15 plants per treatment. The intrinsic water use efficiency was calculated as the ratio between A and gs (A/gs).

At 39 days after flooding, the total chlorophyll content obtained from the SPAD index (SPADi) was estimated using a portable SPAD-502 chlorophyll meter (Minolta, Japan). Soon after, the flooded and non-flooded plants were harvested for LA, RDM, SDM, LDM, and TDM evaluations, following the same procedures described above. The root mass ratio (RMR = RDM/TDM), stem mass ratio (SMR = SDM/TDM), leaf mass ratio (LMR = LDM/TDM), and leaf area ratio (LAR = LA/TDM) were calculated. Based on dry mass data obtained at the beginning and end of flooding, we calculated the relative growth rates of roots (RGRr), stems (RGRs), leaves (RGRl) and total (RGRt) and net assimilatory rate (NAR) based on the method described by Hunt et al. (2002) using the formulas RGR = (lnDM₂ - lnDM₁)/t and NAR = [(TDM₂ - TDM₁)/t] x [(lnLA₂ - lnLA₁)/(LA₂ - LA ₁)]; where indices 1 and 2 represent the initial and final values, and t is the number of days between harvests. For RGR, DM is the dry mass of roots (RDM), stems (SDM), leaves (LDM) or total per plant (TDM).

The experimental design was completely randomized with 2 soil water levels (flooded and control), 15 replicates for biomass and SPADi, and 10 replicates for leaf gas exchange. The comparisons of means were performed using the t-test.

3. RESULTS

Plants subjected to flooding conditions did not present symptoms of flood stress such as chlorosis, epinasty, senescence, and foliar abscission, but did develop hypertrophied lenticels ( Figure 1 ). After 16 days of flooding, some lenticels had become visible and at 37 days after flooding all the flooded plants had lenticels. The roots of the flooded plants had darker coloration than the control plants and some roots of the flooded plants had a strong odor.

Figure 1
Frequency distribution for the index of presence of lenticels (0 – no lenticels; 1 – few visible lenticels; 2 – some visible lenticels; 3 – many visible lenticels) of young plants of C. lucens at 16 and 37 days after the beginning of soil flooding.

At 37 days after flooding, significant differences were observed between treatments for A and gs (p ≤ 0.01; t-test) ( Table 1 ). The mean values of A and gs were approximately 80% lower in the flooded plants than in the non-flooded plants. There were no significant differences between treatments for the A/gs ratio (p> 0.05; t-test).

Table 1
Net photosynthetic rate (A), stomatal conductance (gs), and intrinsic water-use efficiency (A/gs) for young plants of C. lucens subjected to soil flooding for 37 days. Means ± standard errors (n=10).

Variable	Non-flooded	Flooded	% Control
A (µmol m-2 s-1)	6.25 ± 0.70	1.34 ± 0.38**	16
gs (mmol m-2 s-1)	53.8 ± 8.1	8.6 ± 1.8**	21
A/gs (µmol mmol-1)	120.8 ± 8.1	129.6 ± 18.5ns	107

• Statistical significance between non-flooded and flooded plants is given by the t -test (^nsp > 0,05; ** p ≤ 0.01).

Non-significant differences between non-flooded and flooded plants were observed for RGRs, RGRl, RGRt, NAR, LA, LMR, LAR, and SPADi (p> 0.05; t-test) after 39 days from the beginning of flooding ( Table 2 ). There were significant differences between treatments for tRGR, SMR, (p ≤ 0.05, t-test), and RMR (p ≤ 0.01, t-test).

Table 2
Relative growth rates of root (RGRr), steam (RGRs), leaves (RGRl) and total (RGRt), net assimilation rate (NAR), leaf area (LA), root (RMR), steam (SMR), leaves (LMR) mass ratios, leaf mass ratio (LAR), and SPAD index (SPADi) of young plants of C. lucens subjected to soil flooding for 39 days. Means ± standard errors (n = 15).

Variable	Non-flooded	Flooded	% Control
RGRr (mg g-1 day-1)	13.97 ± 2.78	3.98 ± 2.70*	29
RGRs (mg g-1 day-1)	15.37 ± 1.83	14.45 ± 2.09ns	94
RGRl (mg g-1 day-1)	9.85 ± 2.34	7.00 ± 2.21ns	71
RGRt (mg g-1 day-1)	12.84 ± 2.07	9.08 ± 2.05ns	71
NAR (mg cm-2 day-1)	0.22 ± 0.03	0.15 ± 0.03ns	68
LA (cm2)	455.4 ± 40.9	414.6 ± 34.6ns	91
RMR (g g-1)	0.25 ± 0.01	0.20 ± 0.01**	80
SMR (g g-1)	0.33 ± 0.01	0.37 ± 0.01*	112
LMR (g g-1)	0.42 ± 0.01	0.44 ± 0.01ns	105
LAR (cm2 g-1)	56.15 ± 2.50	59.99 ± 2.73ns	107
SPADi	46.0 ± 1.17	41.2 ± 1.97 ns	90

• Statistical significance between non-flooded and flooded plants is given by the t -test (^nsp > 0.05; *p ≤ 0.05; ** p ≤ 0.01).

Except for SMR, LMR, LAR, and SPADi, all other analyzed variables presented higher values in non-flooded plants than in flooded plants. Even though no significant differences between treatments were observed, the mean RGRl and RGRt values were approximately 25% lower in the flooded plants than in the non-flooded plants. The highest percentage difference between treatments was observed for the RGRr, which was approximately 70% lower in the flooded plants than in the non-flooded plants.

4. DISCUSSION

Plants subjected to soil flooding have different responses in biochemical, physiological, anatomical, and morphological levels ( Lobo & Joly, 2000 ). Many of these responses manifest themselves through visual symptoms and can result in either acclimatization or plant death. The young plants of C. lucens used in the present study survived flooding of the soil for 39 days without presenting visual symptoms of stress, such as epinasty, chlorosis, or leaf fall ( Kozlowski & Pallardy, 2002 ). In addition, the appearance of lenticels at the base of the stems were very visible, which is a visual symptom of acclimatization to flooding that has also been observed in other tree species, such as Cecropia pachystachya, ( Batista et al., 2008 ), Erythrina speciosa ( Medina et al., 2009 ), Lithraea molleoides ( Medri et al., 2007 ), Tabebuia avellanedae ( Davanso et al., 2002 ), and Lonchocarpus sericeus ( Lira et al., 2013 ). Although the flooded plants survived the soil flooding, they presented decreased growth rates and darkening of the roots.

Oliveira (2012) verified that young plants of C. langsdorffii subjected to soil flooding for 30 days presented a decrease in root growth, with roots becoming dark in color and showing the beginning of deterioration. Root browning might be related to increased enzyme activity associated with anaerobic respiration, leading to excess ethanol production. According to a study by Lobo & Joly (2000) , when O₂ supply is limited, an acceleration of glycolysis and anaerobic respiration leads to an excess of lactic acid production by the lactate dehydrogenase (LDH) enzyme to compensate the low energy production in mitochondrial respiration. However, as the cellular pH decreases, LDH decreases its activity and there is an increase in the activity of the alcohol dehydrogenase (ADH) enzyme, which is responsible for the last stage of the alcoholic fermentation pathway ( Xia & Roberts, 1994 ). The acceleration of glycolysis is dependent on the supply of carbohydrates transported from the aerial part of the plant to the roots, or even from the stock of reserve starch in the root parenchyma and can contribute to the maintenance of the root metabolism when the supply of O₂ is limited ( Gravatt & Kirby, 1998 ).

Because they are volatile, fermentation products (acetaldehyde and ethanol) can be eliminated by means of lenticels ( Kozlowski, 2002 ) or stomata ( Kreuzwieser et al., 2004 ). However, when production outstrips the ability of the plant to eliminate ethanol, it can reach toxic intracellular levels. In these cases, ethanol acts as an organic solvent and can promote the disruption of the plasma membrane by the solubilization of the lipid components, causing death and darkening of the roots. Thus, although young plants of C. lucens survived soil flooding for approximately one month, root browning indicates that ethanol production must have exceeded the elimination capacity, possibly causing the death of pre-existing roots and decreasing the growth of new roots.

The partial closure of stomata and decrease in the net photosynthetic rate have been verified in many tropical tree species under flooding conditions ( Mielke & Schaffer, 2010 ; Oliveira & Joly, 2010 ; Gonçalves et al., 2013 ; Lira et al., 2013 ). The decrease in the mean values ​​of gs in plants subjected to soil flooding may be related to the deterioration or decrease of root growth, thus reducing water absorption. Alternatively, the decrease in the mean values ​​of A in plants subjected to soil flooding may be related to stomatal limitation caused by stomatal closure or to the non-stomatal limitation caused by a decrease in the activity of ribulose 1,5-bisphosphate carboxylase/oxygenase enzyme ( Vu & Yelenosky, 2006 ; Dalmolin et al., 2013 ) or by the photoinhibition of photosynthesis. In this case, the excess production of NADPH+ H+ in the photochemistry is not used in the biochemistry of photosynthesis ( Lavinsky et al., 2007 ) and the plant does not present efficient mechanisms for the elimination of energy excess ( Mielke et al., 2003 ). The decreases observed in A and gs in the present study, and the fact that no significant difference between the mean values ​​of the A/gs ratio were found, are indicative that stomatal and non-stomatal limitations of photosynthesis might have occurred. In contrast, the high values ​​of SPADi in both flooded and non-flooded plants indicate that the light collecting systems associated with the photochemical stage of photosynthesis were not compromised by soil flooding.

The decrease in shoot growth (leaves and stems) may be due to the decrease in the net photosynthetic rate or to the decrease in leaf area due to leaf fall. In the present study, leaf fall was not observed; therefore, the decrease in shoot growth can be attributed to the decrease of A. Additionally, the mean values ​​of LA, LMR, and LAR did not differ significantly between flooded and non-flooded plants. However, the increase in mean values ​​of SMR, LMR, and LAR appear to have been due to the decrease of RGRr and, consequently, of the root biomass at the completion of the experiment. The mean values ​​of RGRs and RGRl were practically unaffected by soil flooding. These results reinforce the above discussions, indicating that the decrease in growth observed in flooded plants was mainly caused by the decrease of the root biomass, which affects water transportation and nutrient assimilation, causing stomata closure and decreases in the net photosynthetic rate.

Tree species can be distinguished based on their patterns of response to soil flooding. Intolerant species usually present severe metabolic and physiological dysfunctions in the first few hours or days after flooding starts. An example of a species that is intolerant to soil flooding is the avocado (Persea americana) ( Gil et al., 2009 ). Species that are tolerant to flooding, such as Taxodium distichum and Annona glabra ( Allen et al., 1996 ) and Annona glabra ( Mielke et al., 2005 ) present several anatomical, morphological, and physiological adaptations to maintain high growth rates even after long periods (months or years) of flood conditions. The third group is represented by partially tolerant species, which have characteristics that, even with the reduction of growth, can survive occasional periods of soil flooding. Examples of tree species partially tolerant to flooding are Prioria copaifera ( Lopez & Kursar, 1999 ), Genipa americana ( Mielke et al., 2003 ), Calophyllum brasiliensis ( Oliveira & Joly, 2010 ), Genipa spruceana ( Gonçalves et al., 2013 ), and Inga marginata ( Bender et al., 2016 ). From the results obtained in the present study, it is possible that young plants of C. lucens fit into the third group, i.e., decreases in A and gs and in growth rates, mainly of roots, although the plants survived the soil flooding for approximately one month.

Copaifera plants are popularly known as copaibeiras or pau-d’óleo, and generally have heights of 10 to 40m, and dense foliage composed of alternating composite pinnate leaves with leathery leaflets of 3 to 6cm in length ( Pio Corrêa, 1984 ). In the case of C. langsdorffii, the most well studied species in the genus, seed dispersal is carried out by birds ( Motta & Lombardi, 1990 ) or hydrocoral ( Martins et al., 2008 ), indicating their potential use for restoration of degraded riparian forests. Oliveira (2012) verified that young plants of C. langsdorffii survived soil flooding for 30 days, without presenting chlorosis or foliar necrosis, despite the decrease in root growth, which was observed in the present study for C. lucens. In the present study, we demonstrated that young plants of C. lucens present a decrease in carbon fixation by photosynthesis, which is probably associated with a reduction in stomatal conductance caused by a diminution in root growth rate. Despite the decrease in growth, the plants did not show symptoms of severe stress caused by soil flooding, indicating that this species could be used for plantings enrichment in degraded riparian forests.

5. CONCLUSION

Based on these results and considering the conditions under which the study was carried out, we can conclude that young plants of C. lucens are able to tolerate soil flooding for a period of approximately one month, even though they showed significant decreases in root growth rate, stomatal conductance, and net photosynthetic rate. These results are indicative to the possibility of including C. lucens in the list of species indicated for the restoration of degraded riparian forests in regions where this species naturally occurs.

ACKNOWLEGEMENTS

Daniela B. Vidal was a Master’s degree scholarship student at the Foundation for Research Support of the State of Bahia (FAPESB). The authors acknowledge the Terra Vista settlement and biologists Jose Lima da Paixão and Michaele Pessoa for providing the plant material used in this study. The authors also acknowledge the curator of the HUESC, Prof. Luiz Alberto Mattos Silva. Marcelo S. Mielke gratefully acknowledge CNPq (Brazilian National Council for Scientific and Technological Development) for the award of fellowship of scientific productivity (306531/2015-1).

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Publication Dates

• Publication in this collection
  07 Jan 2019
• Date of issue
  2019

History

• Received
  29 Nov 2016
• Accepted
  24 Jan 2018