Activities of key enzymes in sucrose-to-starch conversion in wheat grains subjected to water deficit during grain filling

Plant Physiology
Jianchang YangQingsen Zhu

Abstract

This study tested the hypothesis that a controlled water deficit during grain filling of wheat (Triticum aestivum) could accelerate grain-filling rate through regulating the key enzymes involved in Suc-to-starch pathway in the grains. Two high lodging-resistant wheat cultivars were field grown. Well-watered and water-deficit (WD) treatments were imposed from 9 DPA until maturity. The WD promoted the reallocation of prefixed 14C from the stems to grains, shortened the grain-filling period, and increased grain-filling rate or starch accumulation rate (SAR) in the grains. Activities of Suc synthase (SuSase), soluble starch synthase (SSS), and starch branching enzyme (SBE) in the grains were substantially enhanced by WD and positively correlated with the SAR. ADP Glc pyrophosphorylase activity was also enhanced in WD grains initially and correlated with SAR with a smaller coefficient. Activities of granule-bound starch synthase and soluble and insoluble acid invertase in the grains were less affected by WD. Abscisic acid (ABA) content in the grains was remarkably enhanced by WD and very significantly correlated with activities of SuSase, SSS, and SBE. Application of ABA on well-watered plants showed similar results as those by WD. ...Continue Reading

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Citations

Jan 16, 2013·Carbohydrate Research·Xiaodong Ren, Junjie Zhang
Aug 26, 2011·The Journal of Biological Chemistry·Yi ZhengR Michael Garavito
Apr 23, 2013·Journal of Experimental Botany·Tingting ChenJianhua Zhang
Feb 27, 2016·Plant Physiology and Biochemistry : PPB·Zhihui GuanWenquan Wang
Aug 8, 2015·Journal of Experimental Botany·Quan XieDebbie L Sparkes
Jan 18, 2006·The New Phytologist·Jianchang Yang, Jianhua Zhang
Nov 1, 2007·Plant, Cell & Environment·Beáta BarnabásAttila Fehér
Jul 23, 2008·Plant, Cell & Environment·Sonia M Cuellar-OrtizAlejandra A Covarrubias
Apr 1, 2015·Photosynthesis Research·Baoshan WangXinghong Yang
Mar 8, 2012·Journal of Proteome Research·Ayesha Tasleem-TahirGérard Branlard
Jun 5, 2018·International Journal of Genomics·Chunsheng GaoGonggu Zang
Apr 26, 2018·Frontiers in Plant Science·Xiong DengYueming Yan

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