Journal of Integrative Agriculture ›› 2020, Vol. 19 ›› Issue (12): 2983-2996.DOI: 10.1016/S2095-3119(20)63431-1

所属专题: 水稻耕作栽培合辑Rice Physiology · Biochemistry · Cultivation · Tillage

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  • 收稿日期:2020-08-27 出版日期:2020-12-01 发布日期:2020-11-19

Changes in starch quality of mid-season indica rice varieties in the lower reaches of the Yangtze River in last 80 years

ZHANG Hao, JING Wen-jiang, XU Jing-ju, MA Bing-ju, WANG Wei-lu, ZHANG Wei-yang, GU Jun-fei, LIU Li-jun, WANG Zhi-qin, YANG Jian-chang   

  1. Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, P.R.China
  • Received:2020-08-27 Online:2020-12-01 Published:2020-11-19
  • Contact: Correspondence YANG Jian-chang, Tel/Fax: +86-514-87979317, E-mail: jcyang@yzu.edu.cn
  • About author:ZHANG Hao, Tel/Fax: +86-514-87979317, E-mail: haozhang@yzu.edu.cn;
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2016YFD0300206-4, 2017YFD0301206 and 2018YFD0300801), the National Natural Science Foundation of China (31671614 and 31871559), the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, China, the Six Talent Peaks Project in Jiangsu Province, China (SWYY-151), the Jiangsu Agriculture Science and Technology Innovation Fund, China (CX(18)3007), and the Top Talent Support Plan of Yangzhou University, China (2015-01).

Abstract:

Rice (Oryza sativa L.) quality depends mainly on the characteristics of starch stored in kernels.  Understanding the changes in starch characteristics in kernels during variety improvement would have great significance to improve rice quality.  This study was designed to investigate the starch characteristics in the kernels and associated physiological traits of indica rice varieties in the lower reaches of the Yangtze River in China in last 80 years.  Eight representative mid-season indica rice varieties were grown in the field.  The results showed that the grain yield was significantly increased with the improvement of varieties and such an increase was mainly attributed to the increase in total number of spikelets.  The tall varieties applied in the 1940s–1950s had higher protein content, relative crystallinity and infrared (IR) ratio of 1 045/1 022 cm–1.  The semi-dwarf varieties applied in the 1980s–1990s had higher gel consistency, amylopectin content, IR ratio of 1 022/995 cm–1, and breakdown value.  With the improvement of varieties, the amylose content, large-sized starch granule number and volume distribution, onset and peak of gelatinization temperature, gelatinization and retrogradation enthalpy, setback value, pasting temperature, viscosity of peak, hot and final, and 1-aminocycopropane-1-carboxylic acid (ACC) concentrations in panicles and root bleeding were gradually decreased, whereas the medium-sized starch granule number and volume distribution, activities of key enzymes in grains, and zeatin (Z)+zeatin riboside (ZR) contents in panicles and root bleeding at grain filling stage were gradually increased.  Correlation analysis showed that starch thermodynamic characteristics were closely related to starch structure and components, key enzymes and hormones.  The results suggest that starch quality was enhanced through the optimization of starch components, structure, thermodynamics, and the regulation of key enzymes in grains and hormones in panicles and root bleedings at grain filling stage during the improvement of mid-season indica rice.

Key words: rice ,  starch ,  thermodynamics ,  hormone ,  variety improvement