干旱条件下不同茎段对冬小麦水溶性碳水化合物沉积的影响

M. Tarasiuk, O. Stasik, G. Priadkina, D. Konovalov
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摘要

的目标。评价自然水分亏缺条件下冬小麦茎秆不同节间和叶鞘在储备水溶性碳水化合物(WSC)储存和再动员中的作用,为高产基因型的选择提供有效的标准。方法。测定灌浆初期和灌浆末期WSC的具体含量和总量以及茎秆不同部位WSC的再动员量。结果。结果表明,现代冬小麦品种储备水分主要集中在2、3、4 ~ 5节间积累和动员,花梗和叶鞘的贡献要小得多。高产品种基夫斯卡17的茎段水分积累能力最高,产量较低的品种波拉德尼茨亚的茎段水分积累能力最低。结论。干旱条件下冬小麦育种过程中,茎秆第2节和第3节WSC的积累和再动员值可以表征茎秆的储存能力,并可用于评价其与籽粒生产力的关系。
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The role of different stem segments in the deposition of water-soluble carbohydrates in winter wheat varieties under drought conditions
Aim. Evaluation of the role of different internodes and leaf sheaths of winter wheat stem in storage and remobilization of reserve water-soluble carbohydrates (WSC) under natural water deficit in order to develop effective criteria for selection of high-yielding genotypes. Methods. The specific content and total amount of WSC at the onset and the end of grain filling and the quantity of WSC remobilized in different parts of the stem were determined. Results. It was found that the main part of reserve WSC in plants of modern winter wheat varieties was accumulated and mobilized in the 2nd, 3rd and 4-5th (counting from above) internodes, the contribution of peduncle and leaf sheaths was much smaller. The highest WSC depositing capacity of all stem segments were found in the high-yielding variety Kyivska 17 and the lowest one in the less productive variety Poradnytsia. Conclusions. The values of accumulation and remobilization of WSC in the 2nd and 3rd from the top internodes can characterize the storage capacity of the stem and be used to assess the relationships with grain productivity in the breeding winter wheat in arid conditions.
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