期刊
JOURNAL OF CEREAL SCIENCE
卷 55, 期 3, 页码 331-336出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jcs.2012.01.004
关键词
Fructans; High temperature pre-acclimation; Starch granules; Wheat
资金
- National Natural Science Foundation of China [30971734, 31028017, 31171484]
- Research Innovation Project for Graduate Students of Jiangsu Province [CX10B-3112]
- Natural Science Foundation of Jiangsu Province [BK2008329]
- Specialized Research Fund for the Doctoral Program of Higher Education [20090097110009]
- Ministry of Agriculture [200903003]
- China Agriculture Research System [CARS-03]
The potential role of pre-anthesis high temperature acclimation in alleviating the negative effects of post-anthesis heat stress on stem stored carbohydrate remobilization and grain starch accumulation in wheat was investigated. The treatments included no heat-stress (CC), heat stress at pre-anthesis only (HC), heat at post-anthesis only (CH), and heat stress at both stages (HH). Post-anthesis heat stress decreased grain starch content, reduced the content of fructans and depressed activities of related synthesis enzymes of sucrose:sucrose fructosyltransferase and fructan:fructan fructosyltransferase. Interestingly, HH plants had significantly higher grain yield than the CH plants. In addition, post-anthesis high temperature lowered grain starch content and increased percentages of volume, number and surface area of B-type starch granules in CH and HH than in CC treatment. However, HH plants had much higher starch content, and caused less modified B-type starch granule size indicators than the CH plants. Our results indicated that, compared with the non-acclimated plants, the pre-anthesis high temperature acclimation effectively enhanced carbohydrate remobilization from stems to grains, led to less changed starch content and starch granule size distribution in grains of wheat under post-anthesis heat stress. (C) 2012 Elsevier Ltd. All rights reserved.
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