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Title: Specific and non-specific responses of Hyacinth bean (Dolichos lablab) to drought stress
Authors: D’souza, Myrene R
Devaraj, V R
Keywords: Antioxidants;antioxidant enzymes;Dolichos lablab;drought stress;hyacinth bean proline;malondialdehyde
Issue Date: Jan-2011
Publisher: NISCAIR-CSIR, India
Abstract: Drought and salinity stress are the major causes of historic and modern agricultural productivity losses throughout the world. The availability of irrigation water is a challenge for many countries that have scarce water resources, yet are highly dependent on agriculture as a means of revenue. Effect of drought on Hyacinth bean, Dolichos lablab (HA-4 cultivar) was evaluated in 10-d-old seedlings for 8 d after withholding water. The stress reduced dry and fresh weight, leaf number, surface area, root and shoot length, total chlorophyll and relative water content. Oxidative stress markers, H2O2, glutathione, malondialdehyde, proline, ascorbic acid, total phenols, and total soluble sugars were significantly elevated. Drought enhanced antioxidant enzymes, peroxidase and glutathione reductase, and reduced catalase in a time dependent manner in the leaves. POX and CAT in roots showed inverse relationship with the duration of stress, whereas GR exhibited increased activity. The metabolic activitiy of enzymes, β-amylase and acid phosphatase, increased temporally in leaves and roots. Intensity of isozymes correlated with in vitro levels under stress. The plant showed ability to rehydrate and grow upon re-watering, and levels of antioxidant components correlated with drought tolerance of the plant
Page(s): 130-139
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Appears in Collections:IJBT Vol.10(1) [January 2011]

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