| 适度土壤干旱对贪青小麦茎鞘贮藏性糖运转及籽粒充实的影响 |
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| 引用本文： | 王维,张建华,杨建昌,朱庆森.适度土壤干旱对贪青小麦茎鞘贮藏性糖运转及籽粒充实的影响[J].作物学报,2004,30(10):1019-1025. |
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| 作者姓名： | 王维 张建华 杨建昌 朱庆森 |
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| 作者单位： | 扬州大学作物栽培生理重点开放实验室，江苏扬州 225009 |
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| 基金项目： | 香港浸会大学校科研和教改项目，香港研究资助局资助项目 |
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| 摘 要： | 选用春性小麦品种扬麦158和扬麦11为材料，设置出穗后高氮和正常氮两个水平及土壤水分胁迫处理(WS)，以正常浇水为对照(WW)，研究适度土壤干旱对贪青迟熟小麦籽粒灌浆和茎鞘贮藏性碳水化合物分配的影响。结果表明，在始穗期施用过量氮肥(HN)导致小麦贪青迟熟，主要表现为灌浆速率和产量降低，茎鞘中滞留大量贮藏性糖。在灌浆
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| 关 键 词： | 土壤干旱 衰老 物质运转 籽粒充实 小麦 |
| 收稿时间： | 2003-05-19 |
| 修稿时间： | 2003年5月19日 |
Effects of Controlled Soil Drought on Remobilization of Stem-stored Carbohydrate and Grain Filling of Wheat with Unfavorably-delayed Senescence |
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| WANG Wei ,ZHANG Jian-Hua ,YANG Jian-Chang,ZHU Qing-Sen.Effects of Controlled Soil Drought on Remobilization of Stem-stored Carbohydrate and Grain Filling of Wheat with Unfavorably-delayed Senescence[J].Acta Agronomica Sinica,2004,30(10):1019-1025. |
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| Authors: | WANG Wei ZHANG Jian-Hua YANG Jian-Chang ZHU Qing-Sen |
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| Institution: | Key Laboratory of Crop Cultivation & Physiology, Yangzhou University, Yangzhou 225009, Jiangsu |
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| Abstract: | Two spring wheat cultivars (cvs Yangmai 158 and Yangmai 11) were grown in the field and two levels of nitrogen, normal (NN) and high (HN), were applied at heading. Controlled soil water deficiency was imposed at 9 d after anthesis. Results showed that plant senescence was unfavorably delayed by high nitrogen application, which resulted in a slow grain filling and low grain yield as well as more water soluble sugar (WSC) stored in stem. Water deficiency significantly reduced mid-day leaf water potential and enhanced plant senescence at mid-later stage of grain filling. Such drought stress significantly increased grain-filling rate by 9.6%-21.5% at NN and 40.9%-50.5% at HN, and shortened grain-filling period by 4.9-6.1 d at NN and 6.2-9.7 d at HN, respectively, as compared to well-watered treatments. The grain weight and grain yield under water deficiency were significantly decreased at NN, but significantly increased at HN. At maturity, WSC in stem and sheath was greatly reduced, and the greater proportion of pre-fed 14C in the stems and sheaths was repartitioned into grain by soil drought in both nitrogen treatments. The contribution of stored WSC to grain yield under drought stress was greatly increased and was 2.0-2.1 times at NN and 4.8-5.3 times at HN respectively higher than that of well-watered condition. In conclusion, a controlled soil drought can play a positive role and improve grain filling when plant senescence is unfavorably delayed. |
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| Keywords: | Soil drying Senescence Remobilization of stored reserve Grain filling Wheat |
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