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Journal of Integrative Agriculture  2024, Vol. 23 Issue (11): 3692-3705    DOI: 10.1016/j.jia.2023.10.006
Special Issue: 水稻耕作栽培Rice Physiology · Biochemistry · Cultivation · Tillage
Crop Science Advanced Online Publication | Current Issue | Archive | Adv Search |
Assessing the yield difference of double-cropping rice in South China driven by radiation use efficiency

Jian Lu1, 2, 3, Sicheng Deng1, 2, 3, Muhammad Imran1, 2, 3, Jingyin Xie1, 2, 3, Yuanyuan Li1, Jianying Qi1, 2, 3, Shenggang Pan1, 2, 3, Xiangru Tang1, 2, 3#, Meiyang Duan1, 2, 3#

1 State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/College of Agriculture, South China Agricultural University, Guangzhou 510642, China

2 Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China

3 Guangzhou Key Laboratory for Science and Technology of Fragrant Rice, Guangzhou 510642, China

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摘要  

华南双季稻持续突破总产量纪录,而单季稻的产量潜力未能实现。辐射利用效率(RUE)被认为是谷类作物产量的重要决定因素。然而,目前尚无关于双季稻的产量差异是否涉及到RUE的信息。为了评估截获辐射(IP)和RUE对华南双季稻区4个代表性品种(象牙香占、美香占2号、南晶香占、软华优金丝)在早季和晚季的地上部生物量、作物生长速率(CGR)和收获指数(HI)的影响,开展了为期两年的田间试验。早稻的产量比晚稻高8.2%。早稻的产量优势主要源于较高的RUE决定的更高的每穗粒数和地上部生物量。象牙香占、美香占2号、南晶香占和软华优金丝在早稻种植的每穗粒数比晚稻分别高出6.5%、8.3%、6.9%和8.5%。早稻较高的产量与分蘖中期RUE(R2=0.34)、幼穗分化期RUE(R2=0.16)、成熟期RUE(R2=0.28)和截获光合有效辐射(R2=0.28)密切相关,而晚稻的产量则更多的依赖于分蘖中期的截获光合有效辐射(R2=0.31)和幼穗分化期的截获光合有效辐射(R2=0.23)。较高的RUE有助于早稻的产量提高,而晚稻产量的提高主要依赖于生育早期更高的光合有效辐射。因此,合理调配双季稻的RUE,选择具有较高RUE的品种或调整播期等途径值得更长远的研究。



Abstract  
Double-cropping rice in South China continues to break the total yield record, but the yield potential of single-cropping rice is not being realized.  Radiation use efficiency (RUE) has been singled out as an important determinant of grain yield in many cereal species.  However, there is no information on whether the yield gaps in double-cropping rice involve differences in RUE.  Field experiments were performed over two years to evaluate the effects of intercepted radiation (IP) and RUE on the above-ground biomass production, crop growth rate (CGR), and harvest index (HI), in four representative rice varieties, i.e., Xiangyaxiangzhan (XYXZ), Meixiangzhan 2 (MXZ2), Nanjingxiangzhan (NJXZ), and Ruanhuayoujinsi (RHYJS), during the early and late seasons of rice cultivation in South China.  The results revealed that grain yield in the early season was 8.2% higher than in the late season.  The yield advantage in the early season was primarily due to higher spikelets per panicle and above-ground biomass resulting from a higher RUE.  The spikelets per panicle in the early season were 6.5, 8.3, 6.9, and 8.5% higher in XYXZ, MXZ2, NJXZ, and RHYJS, respectively, than in the late season.  The higher early season grain yield was more closely related to RUE in the middle tillering stage (R2=0.34), panicle initiation (R2=0.16), and maturation stage (R2=0.28), and the intercepted photosynthetically active radiation (IPAR) in the maturation stage (R2=0.28), while the late season grain yield was more dependent on IPAR in the middle tillering stage (R2=0.31) and IPAR at panicle initiation (R2=0.23).  The results of this study conclusively show that higher RUE contributes to the yield progress of early season rice, while the yield improvement of late season rice is attributed to higher radiation during the early reproductive stage.  Rationally allocating the RUE of double-cropping rice with high RUE varieties or adjustments of the sowing period merits further study.


Keywords:  grain yield       radiation use efficiency        double-cropping rice  
Received: 06 June 2023   Accepted: 28 August 2023
Fund: 
This work was funded by the National Natural Science Foundation of China (31971843), the Modern Agroindustrial Technology System of Guangdong Province, China (2021KJ105), and the Guangzhou Science and Technology Project, China (202103000075 and 202102100008).

About author:  Jian Lu, E-mail: Lj15090709256@126.com; #Correspondence Xiangru Tang, Tel/Fax: +86-20-85280203, E-mail: tangxr@scau.edu.cn; Meiyang Duan, Tel/Fax: +86-20-85280203, E-mail: meiyang@scau.edu.cn

Cite this article: 

Jian Lu, Sicheng Deng, Muhammad Imran, Jingyin Xie, Yuanyuan Li, Jianying Qi, Shenggang Pan, Xiangru Tang, Meiyang Duan. 2024. Assessing the yield difference of double-cropping rice in South China driven by radiation use efficiency. Journal of Integrative Agriculture, 23(11): 3692-3705.

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