Optimized nitrogen management improves grain yield of rice by regulating panicle architecture in South China

• DOI: 10.1016/j.heliyon.2024.e34607
• Publication Date: 2024-07-18T01:34:49Z
• Authors: Xiangyu Hu; Yanzhuo Liu; Xuhua Zhong; Rui Hu; Meijuan Li; Bilin Peng; Junfeng Pan; Kaiming Liang; Youqiang Fu; Nongrong Huang
• Keywords: Panicle

Optimized nitrogen (N) management (OPT), with reduced total N input and more applied during panicle development, has been proved to increase grain yield of rice through enlargement. However, the changes in architecture source variation are not well understood. A hybrid variety named Tianyou 3618 was subjected OPT farmer's fertilizer practice (FFP) early cropping seasons 2016 2017. With 16.7 % less input, increased size by 8.6 27.4 %, 13.8 12.3 for 2017, respectively. had greater dry matter accumulation uptake from initiation heading, which bolstered The number surviving florets per branch quite constant under different treatments all primary, secondary, tertiary branches, implying that mainly determined branches rather than branch. Little change observed between FFP differentiation, degeneration survival primary their florets. Surviving secondary were significantly those FFP. resulted both enhanced differentiation degeneration. While merely though also dramatically increased. Among differentiated OPT, 32.4%-36.3 61.6%-67.7 came 62.2%-65.2 32.5%-37.8 Both principal contributors OPT. To our knowledge, this is first report on detailed involvement enlargement gain