Exogenous Application of Abscisic Acid or Gibberellin Acid Affects Starch Granule Size Distribution in Grains of Wheat Running title: Starch Granule Size Distribution in Wheat Grain
Granule size distribution of wheat starch is an important characteristic that can affect its chemical composition and the functionality of wheat products.Two high-yield winter wheat cultivars currently used in local wheat production,Gaocheng8901 and Shannong1391,were used to evaluate the effects of the exogenous spraying of ABA or GA during the reproductive phase of the initial grain filling on starch granule size distribution and starch components in grains at maturity,the field experiments were carried out in growing seasons 2009-2010 and 2010-2011.The results indicated that a bimodal curve was found in the volume and surface area distribution of grain starch granules,and the number distribution had a unimodal curve.The exogenous ABA resulted in a significant increase in the proportions (both by volume and by surface area) of B-type (＜9.9 μm in diameter) starch granules,with a reduction in those of A-type (＞9.9 μm)starch granules,meanwhile,the exogenous GA3 led to converse effects on size distribution of those starch granules.The exogenous ABA also increased starch content,starch components content at maturity but significantly reduced the ratio of amylose to amylopectin.Application of GA3 significantly reduced starch content,amylopectin content but increased the ratio of amylose to amylopectin.The ratio of amylose to amylopectin showed a significant negative relationship with the volume proportion of granules ＜2.8μm and 2.8-9.9 μm but was positively related to the volume proportion of granules 22.8-42.8 μm.
abscisic acid gibberellin granule size distribution starch winter wheat (Triticum aestivum L.)
PENG Dian Liang WANG Zhen Lin CAI Tie YIN Yan Ping YANG Wei Bing NI Ying Li YANG Dong Qing
National Key Laboratory of Crop Biology, Shandong Agricultural University, Taian 271018. P.R.China
国内会议
北京
英文
330-340
2012-11-01（万方平台首次上网日期，不代表论文的发表时间）