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Characterization of contrasting genotypes reveals general physiological and molecular mechanisms of heat-stress adaptation in maize (Zea mays L.)

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Title Characterization of contrasting genotypes reveals general physiological and molecular mechanisms of heat-stress adaptation in maize (Zea mays L.)
Not Available
 
Creator Ishwar Singh, Suprokash Debnath, Anuradha Gautam & Pranjal Yadava
 
Subject Maize, Heat-stress, Photosynthesis, Antioxidant genes
 
Description Not Available
In order to dissect the adaptation response of
maize to heat-stress, we characterized and juxtaposed different
physio-biochemical parameters for two contrasting
genotypes, namely DTPYC9F119 (heat-stress tolerant) and
K64R (heat-stress susceptible) under 6 days heat treatment
(38/28 C). Chlorophyll a and b content was found to be
reduced under high temperature in both the genotypes, but,
it was reduced more prominently in the susceptible genotype
(K64R). Net photosynthetic rate was significantly
reduced under high temperature in K64R but this reduction
was relatively lower in case of DTPYC9F119. Stomatal
conductance was increased under stress treatment in both
the genotypes but the rate of increase was lower in tolerant
one (DTPYC9F119). Activity of anti-oxidant enzymes
(viz. catalase, peroxidase and superoxide dismutase) and
their gene expression was increased in both the genotypes
under heat-stress condition. Thus, the heat-stress tolerant
genotype has evolved some strategies like modulation of
anti-oxidant gene expression, lower transpiration rate,
lower increase of internal CO2 concentration which could
make sustain a basic level of photosynthesis even under
high temperature stress, etc. that may contribute to its
tolerance trait.
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Date 2020-12-15T09:11:11Z
2020-12-15T09:11:11Z
2020-04-18
 
Type Article
 
Identifier Singh, I., Debnath, S., Gautam, A. and Yadava, P. (2020). Characterization of contrasting genotypes reveals general physiological and molecular mechanisms of heat-stress adaptation in maize (Zea mays L.). Physiology and Molecular Biology of Plants,26(5):921-929.
0971-5894
http://krishi.icar.gov.in/jspui/handle/123456789/43308
 
Language English
 
Relation Not Available;
 
Publisher Springer