Delayed sowing increased dry matter accumulation during stem elongation in winter wheat by improving photosynthetic yield and nitrogen accumulation

播种 开花 干物质 农学 光合作用 叶面积指数 氮气 开枪 栽培 野外试验 生物 延伸率 化学 园艺 植物 冶金 材料科学 有机化学 极限抗拉强度
作者
Yuangang Zhu,Juan Liu,Jiaqi Li,Lishan Xian,Jinpeng Chu,Hui Liu,Jian Song,Yinghui Sun,Zhongmin Dai
出处
期刊:European Journal of Agronomy [Elsevier BV]
卷期号:151: 127004-127004 被引量:6
标识
DOI:10.1016/j.eja.2023.127004
摘要

Understanding dry matter (DM) accumulation during the stem elongation period (SE) is important for estimating yields. However, the mechanisms underlying SE at different sowing times, and how the main shoots (MS) and tillers contribute to DM accumulation, remain poorly understood. Field experiments were carried out at different sowing times, with two cultivars being grown during two successive growing seasons. The results showed that delayed sowing increased grain yield and DM accumulation after anthesis in MS, but decreased them in the tillers. Different from after anthesis, delayed sowing improved DM accumulation in both MS and tillers during SE. With delayed sowing, the leaf area index (LAI) of MS decreased significantly at jointing but was not significantly altered at booting or anthesis, whereas the LAI of the tillers decreased significantly at all three stages. The specific leaf area of both MS and tillers decreased significantly with a delay of sowing, but radiation use efficiency improved markedly during SE. Delayed sowing dramatically decreased the net loss of DM in non-surviving tillers and led to an increase in nitrogen (N) accumulation during stem elongation, as well as an increase in N productivity. Conversely, delayed sowing reduced the loss of N in non-surviving tillers. In conclusion, the combination of increased photosynthetic yield and N accumulation, together with decreased loss of DM and N, increased the quantity of DM during SE.
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