Chinese Journal OF Rice Science >
Yield Formation and Photosynthetic Characteristics of Machine-transplanted Late-season Rice with Short Growth Duration
Received date: 2025-01-08
Revised date: 2025-04-07
Online published: 2025-11-19
【Objective】 This study aimed to investigate the high-yield formation and photosynthetic properties of early-season rice varieties used as short growth duration late-season rice under machine-transplanted conditions. The findings are expected to lay a theoretical basis for breeding short growth duration late-season rice varieties and promoting their large-area, high-yield cultivation. 【Method】 Field experiments were conducted from 2021 to 2023 in Yong'an Town, Liuyang City, Hunan Province. Two early-season varieties, Zhongjiazao 17 and Zhongzao 39, which show significant yield differences, were used as experimental materials. Their yield, yield components, dry matter accumulation, leaf photosynthetic characteristics, and canopy structure were measured when grown as short growth duration late-season rice under machine-transplanted conditions. 【Result】 Averaged over the three years, the yield of Zhongzao 39 was 19.76% higher than that of Zhongjiazao 17. In terms of yield components, the 1000-grain weight of Zhongzao 39 was significantly higher (by 7.60%) than that of Zhongjiazao 17. Regarding dry matter production, Zhongzao 39 accumulated 12.24% more of total dry matter than Zhongjiazao 17, mainly due to its stronger pre-heading dry matter production capacity. Zhongzao 39 exhibited stronger early vigor, superior leaf photosynthetic performance at heading, and a better canopy structure during the vegetative growth stage. Specifically, at the heading stage, its net photosynthetic rate, chlorophyll a and b contents, total chlorophyll content, leaf nitrogen content, and specific leaf weight were 10.38% to 29.04% higher than those of Zhongjiazao 17. Furthermore, canopy structure indicators—including pre-heading crop growth rate, leaf area duration, radiation use efficiency, and leaf area index at heading—were 17.80% to 25.95% higher in Zhongzao 39 than those in Zhongjiazao 17. 【Conclusion】 Under machine-transplanted conditions, short growth duration late-season rice varieties characterized by high 1000-grain weight, strong early vigor, and enhanced photosynthetic capacity at the heading stage demonstrate greater yield potential.
LI Xing, ZHANG Ruichun, CHEN Ge, XIE Jiaxin, XIAO Zhengwu, CAO Fangbo, CHEN Jiana, HUANG Min . Yield Formation and Photosynthetic Characteristics of Machine-transplanted Late-season Rice with Short Growth Duration[J]. Chinese Journal OF Rice Science, 2025 , 39(6) : 863 -872 . DOI: 10.16819/j.1001-7216.2025.250106
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