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Assimilates mobilization, stable canopy temperature and expression of expansin stabilizes grain weight in wheat cultivar LOK-1 under different soil moisture conditions

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Title Assimilates mobilization, stable canopy temperature and expression of expansin stabilizes grain weight in wheat cultivar LOK-1 under different soil moisture conditions
Not Available
 
Creator Kumar, M., Raina, S. K., Govindasamy, V., Singh, A. K., Choudhary, R. L., Rane, J., & Minhas, P. S.
 
Subject Wheat
Grain Growth rate
Canopy temperature
Source-sink relations
 
Description Not Available
Grain yield of wheat is primarily determined by both grain number and grain weight, which often influence
each other in response to environmental stimuli. Some of the genotypes are capable of maintaining high single
grain weight (SGW) across the environments. Understanding mechanisms and factors associated with the superiority of such genotypes over others is necessary to enhance productivity of wheat. Experiments were conducted to elucidate the physiological basis of high SGW of LOK-1, a wheat cultivar
grown in dry and hot environments in the central and peninsular zones of India. SGW of LOK-1 was least affected by removal of spikelets indicating little competition between the grains within the spike for assimilates. Reduction in SGW due to defoliation was less and the contribution of stem reserves to the grain development was high in LOK-1 relative to other cultivars. It seems that high level of expression of genes such as expansin (TaExpA6) contributes to the high SGW of LOK-1. Source was not a limiting factor for grain growth of LOK-1 in contrast to other cultivars, whereas sink appeared to be a limiting factor in recently released/identified cultivars. Differences in the amounts of water soluble
stem carbohydrate reserves translocated to grain could be one of the factors contributing to higher grain weight in
LOK-1. High level expression of TaExpA6, one of the genes contributing to the elongation of endosperm, seems to be crucial for grain growth in wheat.
ICAR-NIASM
 
Date 2018-12-01T11:05:01Z
2018-12-01T11:05:01Z
2017-03-21
 
Type Research Paper
 
Identifier 1
1999-3110
http://krishi.icar.gov.in/jspui/handle/123456789/14942
 
Language English
 
Relation Not Available;
 
Publisher Springer