Abstract
ABSTRACT The study was carried out to evaluate the photosynthetic efficiency and growth of yellow passion fruit, cultivated under different levels of irrigation water salinity and exogenous application of hydrogen peroxide. The experiment was carried out in greenhouse of the Universidade Federal de Campina Grande, PB, Brazil, using drainage lysimeters with capacity for 100 dm3, filled with Entisol of sandy texture. The experimental design was randomized blocks using a 4 x 4 factorial scheme, with three repetitions, corresponding to four water salinity (0.7; 1.4; 2.1 and 2.8 dS m-1) and four concentrations of hydrogen peroxide (0, 20, 40 and 60 µM). The different concentrations of hydrogen peroxide were applied by soaking the seed for a period of 24 h and spraying the leaves on the adaxial and abaxial sides. At 35 days after transplanting, the interaction between water salinity and hydrogen peroxide concentrations did not significantly interfere with plant physiology and growth, except for the number of leaves. The hydrogen peroxide did not cause significant effects on any of the evaluated plant variables. Increasing salinity of irrigation water led to reduction in gas exchanges at 61 and 96 days after transplanting. Water salinity inhibited the CO2 assimilation, transpiration, stomatal conductance, instantaneous carboxylation efficiency and stem diameter of passion fruit plants.
Highlights
Material and MethodsPassion fruit is cultivated in countries of tropical and subtropical climate, belonging to the Passifloraceae family, of the genus Passiflora (Coelho et al, 2016)
This study aimed to evaluate the effects of exogenous application of H2O2 on the gas exchanges and growth of yellow passion fruit irrigated with saline water
*,* * - Significant at p ≤ 0.05 and at p ≤ 0.01 by F test. These reductions observed in A, E, gs and carboxylation efficiency (CEi) may be consequences of the osmotic effect caused by the excess of salts in irrigation water, increasing the concentration of salts in the soil
Summary
Material and MethodsPassion fruit is cultivated in countries of tropical and subtropical climate, belonging to the Passifloraceae family, of the genus Passiflora (Coelho et al, 2016). In Brazil, the yellow passion fruit (Passiflora edulis F.) in 2016 was cultivated in 49,889 ha and 703,489 t were harvested, with mean yield of 14.10 t ha-1 (IBGE, 2016). Irrigation promotes quantitative and qualitative gains, due to increases in the levels of yield, uniformity, continuity of production and improvements in external and internal attributes of the fruits (Freire et al, 2010). In the semiarid region of Northeast of Brazil, the occurrence of waters with high salinity is common and becomes an obstacle for the establishment of crops in this region (Cavalcante et al, 2011), because excess of salts in the irrigation water causes several effects on plants, especially reduction in the osmotic potential of the soil solution, nutritional imbalance due to the high ionic concentration, sodium, inhibiting the absorption of other nutrients, and the toxic effect of ions, mainly chloride, sodium and boron (Bosco et al, 2009).
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