SciELO - Scientific Electronic Library Online

 
vol.40 issue6NET PRECIPITATION AND RECHARGE OF GROUNDWATER IN RIACHO FUNDO WATERSHED, FELIXLÂNDIA-MGEFFICIENCY OF THE USE OF YERBA MATE SOLAR RADIATION IN INTERCROPPING OR MONOCROPPING FOR THE ACCUMULATION OF CARBON author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Revista Árvore

On-line version ISSN 1806-9088

Abstract

KUSTER, Vinícius Coelho; PAULA, Mateus Scarpelli Aguiar Marcato de; CASTRO, Silvana Aparecida Barbosa de  and  VALE, Fernando Henrique Aguiar. PHYSIOLOGICAL AND PHENOLOGICAL VEGETATIVE RESPONSES OF Campomanesia adamantium (Cambess) O. Berg (Myrtaceae) TO THE HYDRIC SEASONALITY OF RUPESTRIAN FIELDS. Rev. Árvore [online]. 2016, vol.40, n.6, pp.973-981. ISSN 1806-9088.  https://doi.org/10.1590/0100-67622016000600002.

The rupestrian fields have two well-defined seasons throughout the year, with rainfall rates that reflect the rainy and dry seasons. This distinction in water availability affects the morphology, physiology and chemistry of plants, among other characteristics. Thus, it is aimed at evaluating the leaf water status, vegetative phenology and photosynthetic behavior of Campomanesia adamantium from a rupestrian field during the dry and rainy season. The study was conducted in Serra do Cipó, Minas Gerais, Brazil. From November 2011 to November 2012 it was examined vegetative phenophases and development of six individuals. Water potential, stomatal conductance, quantum yield and concentration of pigments were evaluated from four leaves of 3rd node per individual (n = 4-5) in the dry and rainy seasons. C. adamantium is an evergreen type and presents mature leaves and sprouting throughout the year. This species showed strategies that reduce water loss during the dry season in rupestrian field, such as decrease in stomatal conductance throughout the day, also associated with a reduction in leaf water potential. However, low water availability did not affect the photosynthetic performance, which enables the construction of new leaves and renovation of the crown even in dry periods. Finally, little reduction in the values of Fv/Fm throughout the day and increase the values of ΔF/Fm' in warmer times, both in the dry season, reiterates the ability of C. adamantium to adjust their physiology to seasonal water deficit of the rupestrian field.

Keywords : Stomatal conductance; Water potential; Quantum yield.

        · abstract in Portuguese     · text in English     · English ( pdf )