PHYSIOLOGICAL RELATIONSHIPS IN <i>Aleurites fordii</i> Hemsl. SEEDLINGS

Caron, Braulio Otomar; Schneider, Julia Renata; Elli, Elvis Felipe; Eloy, Elder; Souza, Velci Queiróz de

doi:10.1590/1806-90882017000100002

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Articles • Rev. Árvore 41 (1) • 2017 • https://doi.org/10.1590/1806-90882017000100002 copy

PHYSIOLOGICAL RELATIONSHIPS IN Aleurites fordii Hemsl. SEEDLINGS

RELAÇÕES FISIOLÓGICAS EM MUDAS DE Aleurites fordii Hemsl.

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this work was to evaluate the physiological behavior at different times of the day and the level of dependence between physiological variables and meteorological elements in Aleurites fordii seedlings. The experiment was conducted in a greenhouse, using a completely randomized experimental design, in a uniform scheme composed of 10 evaluation times (from 8 am to 5 pm, with an interval of 1h between evaluations) and three replications. Each replicate consisted of three evaluation plants, totaling nine seedlings, which were arranged on a double border. The following characteristics were evaluated: leaf temperature (ºC), photosynthetically active solar radiation ((mol S^-1 m^-2), stomatal resistance (S cm^-1), and transpiration (mmol H₂O s^-1 m^-2) over a typical day, using a LI-1600 LI-COR digital porometer. The temperature and relative humidity were measured inside the greenhouse, using a thermohygrograph. The evaluations were performed at 244 days after sowing, between 8:00 and 17:00, with an interval of 60 minutes, totaling 10 evaluations. The physiological changes of Aleurites fordii seedlings are affected by the time of day. In general, the physiological variables are highly dependent on meteorological elements. The temperature of the greenhouse and the relative humidity are the meteorological elements that most influence the physiological behavior of Aleurites fordii seedlings.

Keywords:
Transpiration; Stomata; Photosynthetically active solar radiation

Table 1 The existent Pearson correlation coefficients between the meteorological elements and the physiological variables in Aleurites fordii seedlings, where LT: leaf temperature (ºC); PAR: photosynthetically active solar radiation μmol S-1 m-2); SR: stomatal resistance (S cm-1); TR: transpiration (mmol H2O s-1 m-2); RH: relative humidity (%); GT: greenhouse temperature (ºC). 2014.

Attribute	Correlation coefficient
	LT	PAR	SR	TR	RH	GT
LT	1.0
PAR	0.31^ns ns Not significant at 1% probability of error by Student's t-test.	1.00
SR	-0.89^ Significant at the 1% probability level of error by Student's t-test.	0.01^ns ns Not significant at 1% probability of error by Student's t-test.	1.00
TR	0.93^ Significant at the 1% probability level of error by Student's t-test.	0.04^ns ns Not significant at 1% probability of error by Student's t-test.	-0.98^ Significant at the 1% probability level of error by Student's t-test.	1.00
RH	-0.92^ Significant at the 1% probability level of error by Student's t-test.	-0.53^ns ns Not significant at 1% probability of error by Student's t-test.	0.76^ Significant at the 1% probability level of error by Student's t-test.	-0.79^ Significant at the 1% probability level of error by Student's t-test.	1.00
GT	0.92^ Significant at the 1% probability level of error by Student's t-test.	0.24^ns ns Not significant at 1% probability of error by Student's t-test.	-0.84^ Significant at the 1% probability level of error by Student's t-test.	0.88^ Significant at the 1% probability level of error by Student's t-test.	-0.90^ Significant at the 1% probability level of error by Student's t-test.	1.00

Table 2 Means of meteorological and physiological variables of Aleurites fordii seedlings at different times of day, where LT: leaf temperature (ºC); PAR: photosynthetically active solar radiation (ìmol S-1 m-2); SR: stomatal resistance (S cm-1); TR: transpiration (mmol H2O s-1 m-2); RH: relative humidity (%); GT: greenhouse temperature (ºC). 2014.

Time	LT	PAR	SR	TR	RH	GT
8	29.32	503.32	8.09	4.88	69.10	22.95
9	32.72	952.18	9.60	3.70	41.00	30.80
10	35.28	971.06	8.28	5.06	29.00	37.30
11	37.06	1072.21	6.05	6.97	26.00	39.50
12	39.90	1230.00	5.06	9.41	20.00	42.00
13	40.77	1242.22	4.10	12.05	23.00	39.40
14	42.99	1230.00	3.31	16.18	15.00	45.30
15	46.21	969.88	2.48	24.34	14.00	48.70
16	41.63	748.56	2.84	17.48	24.00	43.30
17	40.46	852.20	2.82	16.27	25.00	41.80

Table 3 Regression equations by the Stepwise procedure, in physiological variables of Aleurites fordii seedlings, where SR: stomatal resistance (S cm-1), GT: greenhouse temperature (ºC), TR: transpiration (mmol H2O s-1 m-2); LT: leaf temperature (ºC); RH: relative humidity (%). 2014.

Equation	CV^* * CV= Coefficient of variation; R2aj.= Adjusted coefficient of determination; Sxy= Standard error of estimation.	R2aj.	Sxy
SR=26.3993-0.5129^* * CV= Coefficient of variation; R2aj.= Adjusted coefficient of determination; Sxy= Standard error of estimation. (GT)	0.8	0.93	0.029
TR=-86.8065+1.1084^* * CV= Coefficient of variation; R2aj.= Adjusted coefficient of determination; Sxy= Standard error of estimation. (LT)+0.4863^* * CV= Coefficient of variation; R2aj.= Adjusted coefficient of determination; Sxy= Standard error of estimation. (RH)+1.0275^* * CV= Coefficient of variation; R2aj.= Adjusted coefficient of determination; Sxy= Standard error of estimation. (GT)	3.3	0.94	0.042
LT=18.3131+0.2806^* * CV= Coefficient of variation; R2aj.= Adjusted coefficient of determination; Sxy= Standard error of estimation. (TR)+0.4437^* * CV= Coefficient of variation; R2aj.= Adjusted coefficient of determination; Sxy= Standard error of estimation. (GT)	2.2	0.96	0.065

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