Respostas morfofisiológicas de plantas de maracujá azedo (Passiflora edulis Sims f. flavicarpa Deneger) submetidas à restrição hídrica

Abstract

Passiflora edulisSims f. flavicarpa Degener, known as sour passion fruit or passion fruit, is a species of great commercial interest is booming at the North Pole the fruit of the state of Espirito Santo. During the year this region is dry periods, occasionally in soil water deficiency, affecting growth and consequently the quality of fruits. Currently, few studies have been conducted with passion about the physiological responses regarding metabolism associated with water stress. It is therefore of paramount importance in determining plant tolerance to water deficit. The objective was to evaluate the behavior and anatomical morphophysiological young plants of passionfruit cv. FB-200 Yellow Master and under water restriction. The plants were subjected to three water regimes: constant irrigation (control), intermittent water suspension for 30 days and rehydration of plants under water suspension. At the end of the experiment, water suspension, were analyzed for growth, extraction and quantification of soluble carbohydrates and starch, anatomical analysis in fully expanded leaves, and nutritional assessment of leaves at 30 days of suspension fluid. Plants subjected towater stress showed a decrease in the control relationships in height, leaf area, total dry mass, relative growth rate and net assimilation rate. After rehydration was resumed growth surpassing the control plants. Regarding soluble carbohydrates and starch was observed to decrease from the control plants the concentration of sucrose, fructose and glucose during water restriction and a subsequent rise after rehydration. The analysis of the anatomy of the leaves showed that after a period of 20 days of rehydration fluid, issued the new leaves had reduced stomatal density, stomatal size and thickness of tissue chlorophyll. Thus, one can observe a remarkable plasticity of passion FB 200 as fluid restriction to the short-medium term