Journal
ARCHIVES OF AGRONOMY AND SOIL SCIENCE
Volume 62, Issue 12, Pages 1700-1710Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/03650340.2016.1168517
Keywords
Drought; stomatal conductance; leaf chlorophyll content; transpiration rate; water use efficiency
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Water use efficiency (WUE) is considered as an important component of adaptation to drought stress. This study was conducted to determine the effect of drought stress on gas exchange parameters and selected physiological properties, and also its relations with WUE in summer squash seedlings (Cucurbita pepo L.). Plants were grown in pots under different irrigation levels (D0: 100%, D1: 67% and D2: 33% of the water required to reach the field capacity) in controlled greenhouse. The results show that drought treatments significantly decreased the leaf chlorophyll reading values (LCRV), leaf relative water content (LRWC), stomatal conductance (g(s)), photosynthetic rate (P-N), transpiration rate (T-r), fresh weight (FW) and dry weight (DW) of squash seedlings by 7, 42, 69, 62, 62 63 and 82%, respectively, in D2 treatment compared to D0. However, electrolyte leakage (EL) values increased 72% with severe drought treatments (D2). The highest WUE was obtained by D0 treatment as 0.26gmm(-1). The relationship between P-N and WUE is the strongest one among all leaf gas exchange parameters. Together with T-r, the linear relation with WUE was considerably higher compared to other measured parameters.
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