Mafakheri, A. and Siosemardeh, A. and Bahramnejad, B. and Struik, P.C. and Sohrabi, E.
(2010)
Effect of drought stress on yield, proline and chlorophyll contents in three chickpea cultivars.
Australian Journal of Crop Science, 4 (8).
pp. 580-585.
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Abstract
Drought stress is one of the major abiotic stresses in agriculture worldwide. This study was carried out to investigate the effect of drought
stress on proline content, chlorophyll content, photosynthesis and transpiration, stomatal conductance and yield characteristics in three
varieties of chickpea (drought tolerant Bivaniej and ILC482 and drought sensitive Pirouz). A field experiment with four irrigation regimes
was carried out in a randomized complete block design with three replications. Treatments included control (no drought), drought stress
imposed during the vegetative phase, drought stress imposed during anthesis and drought stress during the vegetative phase and during
anthesis. All physiological parameters were affected by drought stress. Drought stress imposed during vegetative growth or anthesis
significantly decreased chlorophyll a, chlorophyll b and total chlorophyll content. Proline accumulation was higher in ‘ILC482’ than in
‘Pirouz’ both under control and drought stress conditions. Photosynthesis, transpiration, stomatal conductance and yield were higher but
sub-stomatal CO2 concentration was lower under drought stress conditions than under control conditions. The results showed that
mesophyll resistance is the basic determinate of rate of phototosynthesis under drought stress conditions. Under drought conditions the
drought tolerant variety ‘Bivaniej’ gave the highest yield whereas the drought sensitive variety ‘Pirouz’ gave the lowest yield. Drought
stress at anthesis phase reduced seed yield more severe than that on vegetative stage.
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