Discriminating some prospective cultivars of maize (Zea mays L.) for drought tolerance using gas exchange characteristics and proline contents as physiological markers
2008
Jabeen, F. (University of Agriculture, Faisalabad (Pakistan). Dept. of Botany) | Shahbaz, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Botany) | Ashraf, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Botany)
A greenhouse experiment was conducted to discriminate maize (Zea mays L.) cultivars for drought tolerance using gas exchange characteristics and proline contents as physiological markers. Seven maize cultivars viz., Sahiwal-2002, Sadaf, EV-5098, Pak-Afgoyee, Agaiti-2002, Agaiti-85 and EV-1098 were grown under well watered or water deficit condition (60% of field capacity). Imposition of water deficit condition decreased the shoot and root fresh and dry weights, relative water content, photosynthetic and transpiration rates, stomatal conductance, while increased root/shoot ratio, chlorophyll a, b and chlorophyll a/b ratio, proline content and shoot N and K in all maize cultivars. Effect of drought stress was non-significant on shoot or root P and shoot N. Of all maize cultivars, cv. Agaiti-85 was found to be relatively better in growth, proline accumulation and gas exchange characteristics under drought stress as compared to the other cultivars.
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