Starch synthase activity and heat shock protein in relation to thermal tolerance of developing wheat grains |
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Authors: | K V Sumesh P Sharma-Natu M C Ghildiyal |
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Institution: | (1) Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110012, India |
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Abstract: | Wheat (Triticum aestivum L.) cvs. HD 2285 (relatively tolerant) and WH 542 (susceptible) were exposed to ambient and elevated temperature (3–4 °C
higher) in open top chambers during post anthesis period. The grain yield components were determined at the time of maturity.
In order to elucidate the basis of differential tolerance of these cultivars, the excised developing grains (20 d after anthesis)
of ambient grown plants were incubated at 15, 25, 35 and 45 °C for 2 h and then analysed for the activities of soluble starch
synthase (SSS), granule bound starch synthase (GBSS), kinetic parameters of SSS and content of heat shock protein (HSP 100).
The elevated temperature during grain development significantly decreased grain growth in WH 542 whereas no such decrease
was observed in HD 2285. High temperature tolerance of HD 2285 was found to be associated with higher catalytic efficiency
(Vmax/Km) of SSS at elevated temperature and higher content of HSP 100. |
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Keywords: | Additional" target="_blank">Additional grain growth granule bound starch synthase soluble starch synthase Triticum aestivum |
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