Regulation of Grain Number in Wheat Ⅱ Effects of Shading on Carbohydrate Metabolism and Hormone Levels in Spikes before Anthesis

doi:10.3321/j.issn:1000-7091.1997.04.009

Abstract

Abstract: Shading treatments (70～80% light) in 16-8 days and 8-0 days before anthesis decreased grain numbers of wheat spike by 36% and 22%, respectively. The concentrations of reducing sugar and fructan and the activities of sucrose sucrose fructosyltransferase(SST) and soluble acid invertase(AI) were lower in shaded spikes than that in unshaded spikes.Shading did not alter the levels of indoleacetic acid and zeatin/zeatin riboside,but increased the level of abscisic acid (ABA) in the spikes. It is suggested that source limiting could decrease sink ability of wheat spike in using assimilates, maybe,through a influence on the ABA level of spike.

Key words: Wheat, Grain number, Carbohydrate, Hormones, Shading

CLC Number:

S512.1

Wang Zhimin, Wang Shu'an, Su Baolin. Regulation of Grain Number in Wheat Ⅱ Effects of Shading on Carbohydrate Metabolism and Hormone Levels in Spikes before Anthesis[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1997, 12(4): 42-47. doi: 10.3321/j.issn:1000-7091.1997.04.009.

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