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An efficient and thermostable soluble starch synthase in developing maize (Zea mays) grains

Indian Agricultural Research Journals

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Title An efficient and thermostable soluble starch synthase in developing maize (Zea mays) grains
 
Creator PANDEY, RAKESH
KUMARI, ANITA
PAUL, VIJAY
GHILDIYAL, M C
 
Subject Grains
Heat tolerance
Maize
Starch synthase
Wheat
 
Description High temperature during grain-filling stage is an important yield-limiting factor in wheat. It was reported earlier that a decrease in grain growth under high temperature is associated with a decrease in soluble starch synthase (SSS) activity, as this enzyme is extremely sensitive to high temperature. In attempt to identify thermostable SSS, a maize variety, in which grain development takes place under relatively warmer conditions, was compared with durum and aestivum wheat varieties in the present study. Maize was grown in rabi season so that grain development takes place in an increasing temperature as in wheat. The mean of maximum temperature during grain development period was highest for maize. In spite of such a high temperature exposure during grain development, the maize grains had a remarkably higher (3-4 times high) SSS activity as compared to wheat. Granule bound starch synthase (GBSS) activity was considerably lower than SSS activity, indicating SSS is the major enzyme for starch synthesis. High temperature exposure of excised developing grains showed no significant decrease in SSS activity in maize, whereas, T. aestivum var. Lok Bold showed a significant decrease. The present study reveals an efficient and relatively thermostable SSS in maize var. HQPM7 as compared to wheat, which could possibly be utilized in improving thermotolerance for grain growth in wheat.
 
Publisher Indian Council of Agricultural Research
 
Date 2012-06-06
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
 
Format application/pdf
 
Identifier https://epubs.icar.org.in/index.php/IJAgS/article/view/19038
10.56093/ijas.v82i6.19038
 
Source The Indian Journal of Agricultural Sciences; Vol. 82 No. 6 (2012); 548–51
2394-3319
0019-5022
 
Language eng
 
Relation https://epubs.icar.org.in/index.php/IJAgS/article/view/19038/9388
 
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