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Genotypic Variation in Physiological Traits Under High Temperature Stress in Maize

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Title Genotypic Variation in Physiological Traits Under High Temperature Stress in Maize
Genotypic Variation in Physiological Traits Under High Temperature Stress in Maize
 
Creator ICAR_CRIDA
 
Subject Genotypes High temperature stress Maize Physiological traits
 
Description Not Available
Maize (Zea mays L.) is a major cereal crop in India and worldwide whose production and productivity are
greatly affected by high temperature stress. Twenty-one maize genotypes were staggered sown and evaluated for the
variations in different physiological traits under high temperature stress. Observations were recorded for net photosynthetic
rate, transpiration rate, stomatal conductance, leaf temperature, canopy temperature, maximum quantum yield PSII photochemistry (Fv/Fm), SPAD, ASI, stover and grain yield. Meteorological data of cropping season for first and second date
of sowings showed maximum and mean day time temperature of 37.6, 37.2 and 41.4, 37.5 C, respectively, during
reproductive stage. These temperatures were optimal for photosynthesis, fertilization and grain filling in early sown crop,
while for the late sown crop, it was optimal for photosynthesis but above threshold and detrimental for fertilization and
grain filling. Combined analysis of ANOVA showed that all the parameters were found significant with respect to
genotypes (G), date of sowings (T) and their interaction (G * T) except leaf temperature. The high temperature stress
increased the plant stover weight due to increased photosynthesis coupled with maximum quantum yield PSII photochemistry which may improve the total plant growth. Results revealed that high temperature promoted the growth of
vegetative plant parts but affected yield-related parameters. Higher temperatures during vegetative growth improved net
photosynthetic rate resulting in higher total stover yield (28 %) at maturity. It impacted pollen viability and source to sink
supply of photosynthates leading to reduced grain yield (13 %) in all genotypes.
Not Available
 
Date 2020-02-25T05:35:48Z
2020-02-25T05:35:48Z
2015
 
Type Technical Report
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/32465
 
Language English
 
Relation Not Available;
 
Publisher S. K. Yadav, Arun Kumar Shanker, N. Jyothi Lakshmi, M. Maheswari