生物
生长素
根系
开枪
作物
农学
产量(工程)
侧根
延伸率
园艺
拟南芥
基因
材料科学
极限抗拉强度
突变体
生物化学
冶金
作者
Zhaoxia Li,Xinrui Zhang,Yajie Zhao,Yujie Li,Guangfeng Zhang,Zhenghua Peng,Juren Zhang
摘要
Summary Maize is a globally important food, feed crop and raw material for the food and energy industry. Plant architecture optimization plays important roles in maize yield improvement. PIN ‐ FORMED ( PIN ) proteins are important for regulating auxin spatiotemporal asymmetric distribution in multiple plant developmental processes. In this study, Zm PIN 1a overexpression in maize increased the number of lateral roots and inhibited their elongation, forming a developed root system with longer seminal roots and denser lateral roots. Zm PIN 1a overexpression reduced plant height, internode length and ear height. This modification of the maize phenotype increased the yield under high‐density cultivation conditions, and the developed root system improved plant resistance to drought, lodging and a low‐phosphate environment. IAA concentration, transport capacity determination and application of external IAA indicated that Zm PIN 1a overexpression led to increased IAA transport from shoot to root. The increase in auxin in the root enabled the plant to allocate more carbohydrates to the roots, enhanced the growth of the root and improved plant resistance to environmental stress. These findings demonstrate that maize plant architecture can be improved by root breeding to create an ideal phenotype for further yield increases.
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