Abstract
The objective of this study was to evaluate chlorophyll a fluorescence as a stress indicator in Calophyllum brasiliense Cambess seedlings grown with different concentrations of abscisic acid (ABA) under intermittent water deficit condition: daily irrigation without ABA (I); daily irrigation + 10 μM ABA (I 10); daily irrigation + 100 μM ABA (I 100); suspension of daily irrigation without ABA (SI); suspension of daily irrigation + 10 μM ABA (SI 10) and suspension of daily irrigation + 100 μM ABA (SI 100). The intermittent water deficit reduces water status and impairs the photochemical apparatus functioning and seedling quality. The fluorescence measurements helped identify the stress condition of water deficit in the cultivation of C. brasiliense and the beneficial effect of the application of 10 μM of ABA in minimizing stress and facilitating the recovery of seedlings after re-irrigation, while maintaining the integrity and function of the photosynthetic apparatus.
Highlights
Calophyllum brasiliense Cambess. (Clusiaceae), commonly known as ‘guanandi’, is a tree species native to Central and South America
The first group was irrigated daily throughout the experimental period and the soil was maintained at 70% water retention capacity (WRC); this group was considered control based on the concentration of abscisic acid (ABA)
The non-irrigated seedlings treated with 10 μM ABA presented a higher Fv/Fm (0.797) than that of the seedlings subjected to other treatments, including SI 0 ABA (0.768) and SI 100 μM ABA (0.738), and was close to that of the control I 10 μM ABA treatment (0.801) (Figure 1B)
Summary
The objective of this study was to evaluate chlorophyll a fluorescence as a stress indicator in Calophyllum brasiliense Cambess seedlings grown with different concentrations of abscisic acid (ABA) under intermittent water deficit condition: daily irrigation without ABA (I); daily irrigation + 10 μM ABA (I 10); daily irrigation + 100 μM ABA (I 100); suspension of daily irrigation without ABA (SI); suspension of daily irrigation + 10 μM ABA (SI 10) and suspension of daily irrigation + 100 μM ABA (SI 100). The aim of the present study was to evaluate ChlF-a as a stress indicator in C. brasiliense seedlings grown with different concentrations of ABA and under intermittent water deficit condition
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