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Role of antioxidant and anaerobic metabolism enzymes in providing tolerance to maize (<i style="">Zea mays</i> L.) seedlings against waterlogging

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Title Role of antioxidant and anaerobic metabolism enzymes in providing tolerance to maize (Zea mays L.) seedlings against waterlogging
 
Creator Chugh, Vishal
Kaur, Narinder
Gupta, Anil K
 
Subject Zea mays
Maize
Waterlogging
Antioxidative enzymes
Ethanolic fermentation
Antioxidants
 
Description 346-352
The present investigation was undertaken to
identify the possible mode of mechanism that could provide tolerance to maize (Zea mays L.) seedlings under
waterlogging. Using cup method, a number of maize genotypes were screened on
the basis of survival of the seedlings kept under waterlogging. Two tolerant
(LM5 and Parkash) and three susceptible (PMH2, JH3459 and LM14) genotypes were
selected for the present study. Activities of antioxidant and ethanolic fermentation
enzymes and content of hydrogen peroxide (H2O2), glutathione
and ascorbic acid were determined in roots of these genotypes after 72 h of
waterlogging. Waterlogging treatment caused decline in activities of superoxide
dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) in all the
genotypes. However, only susceptible genotypes showed slight increase in
glutathione reductase (GR) activity. Significant reduction in APX/GR ratio in
susceptible genotypes might be the cause of their susceptibility to
waterlogging. The tolerant seedlings had higher GR activity than susceptible
genotypes under unstressed conditions. Stress led to decrease in H2O2
and increase in glutathione content of both tolerant and susceptible genotypes,
but only tolerant genotypes exhibited increase in ascorbic acid under
waterlogging conditions. In the tolerant genotypes, all the enzymes of
anaerobic metabolism viz. alcohol dehydrogenase (ADH), aldehyde dehydrogenase
(ALDH) and pyruvate decarboxylase (PDC) were upregulated under waterlogging,
whereas in susceptible genotypes, only ADH was upregulated, suggesting that
efficient upregulation of entire anaerobic metabolic machinery is essential for
providing tolerance against waterlogging. The study provides a possible
mechanism for waterlogging tolerance in maize.
 
Date 2011-10-21T11:04:28Z
2011-10-21T11:04:28Z
2011-10
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/12944
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJBB Vol.48(5) [October 2011]