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Journal of Integrative Agriculture  2021, Vol. 20 Issue (6): 1438-1456    DOI: 10.1016/S2095-3119(20)63309-3
Special Focus: High quality and high efficiency fertilization of rice Advanced Online Publication | Current Issue | Archive | Adv Search |
Indica rice restorer lines with large sink potential exhibit improved nutrient transportation to the panicle, which enhances both yield and nitrogen-use efficiency
TIAN Qing-lan1, 2, HE Lian-hua1, LIAO Shuang1, LI Wu1, DENG Fei1, ZHOU Wei1, ZHONG Xiao-yuan1, REN Wan-jun1 
1 Key Laboratory of Crop Ecophysiology and Farming System in Southwest China/Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province/College of Agronomy, Sichuan Agricultural University, Chengdu 611130, P.R.China
2 Biotechnology Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, P.R.China
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摘要  

杂交组合的产量和氮素利用率与恢复系密切相关,因此,对高产氮高效型恢复系的农艺性状进行评价是十分必要的。然而,目前尚不清楚哪些骨干恢复系是高产氮高效型,它们的共同农艺性状也尚未被鉴定,在本研究中,我们旨在解决这个问题。我们在3个施氮量下实施了2个大田试验,从15个籼型恢复系中筛选出了5个高产氮高效型恢复系,并研究了不同产量和不同氮素利用率类型恢复系的产量、氮素利用率和养分转运情况。结果表明,产量和地上部总吸氮量随施氮量的增加而增加,而氮素稻谷生产效率随施氮量的增加而降低。高产氮高效型恢复系的每穗粒数较多,单穗重较高;而每穗粒数和单穗重均与产量和氮素利用率呈显著正相关;因此,较大的库容量可能有利于产量和氮素利用率的提高。我们进一步研究了高产氮高效型恢复系与低产氮低效型恢复系在养分向穗部转运方面的差异,发现与低产氮低效型恢复系相比,高产氮高效型恢复系在成熟期其穗部有更高的吸氮量和干物质量占比,在抽穗后有较高的单茎根系伤流强度和穗颈伤流强度,且其穗颈节和叶片维管束发达,有利于养分从根到地上部、从茎和叶到穗部的运输。因此,高产氮高效型恢复系的大库容量优势体现在养分在穗部的积累和分配较多,以及养分在运输通道上的畅通




Abstract  
The yield and nitrogen use efficiency (NUE) of hybrid rice combinations are closely related to restorer line.  Therefore, it is essential to evaluate the agronomic characteristics of restorer lines with high yield and high NUE (HYHN).  However, it is unclear which restorer lines are HYHN, and neither have the common agronomic traits of the HYHN restorer lines been identified.  Aiming to address this issue, we conducted two filed experiments using three nitrogen applications, which screened five HYHN restorer lines from 15 indica restorer lines.  Yield, NUE and nutrient transportation of restorer lines with different yields and NUE types were examined.  Yield and total nitrogen absorption in aboveground biomass (TNA) increased, whereas NUE for grain production decreased with increasing nitrogen application levels.  The HYHN restorer lines had large spikelets and high weight per panicle that were significantly positively correlated with yield and NUE.  Therefore, large sink potential may be beneficial for both yield and NUE.  We further studied the differences in nutrient transportation to panicles between the HYHN and low yield and low NUE (LYLN) restorer lines and found that the former had a higher nitrogen absorption level and dry matter weight ratios of panicle in maturity.  Moreover, the HYHN lines also had a higher root and neck-panicle node bleeding intensity per stem after heading and more developed vascular bundles of neck-panicle nodes and leaves than the LYLN lines, which could contribute to the transportation of nutrients from root to ground and from stem and leaf to spike.  Therefore, the advantages of large sink potential of the HYHN restorer lines include large nutrient accumulation in and distribution to the panicles and smooth flow of nutrients along the transportation channels.
Keywords:  indica hybrid rice        restorer lines        grain yield        nitrogen-use efficiency        sink potential        nutrient transportation  
Received: 12 March 2020   Accepted:
Fund: This work was financially supported by grants from the National Natural Science Foundation of China (31871564), the National Key R&D Program of China (2016YFD0300506 and 2017YFD0301700) and the Sichuan Breeding Key Research Project, China (2016NYZ0051).
Corresponding Authors:  Correspondence REN Wan-jun, E-mail: rwjun@126.com    
About author:  TIAN Qing-lan, E-mail: tianqinglan1991@163.com

Cite this article: 

TIAN Qing-lan, HE Lian-hua, LIAO Shuang, LI Wu, DENG Fei, ZHOU Wei, ZHONG Xiao-yuan, REN Wan-jun. 2021. Indica rice restorer lines with large sink potential exhibit improved nutrient transportation to the panicle, which enhances both yield and nitrogen-use efficiency. Journal of Integrative Agriculture, 20(6): 1438-1456.

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