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Indica rice restorer lines with large sink potential exhibit improved nutrient transportation to the panicle,which enhances both yield and nitrogen-use efficiency

引用

Journal of Integrative Agriculture 2021年第6期20卷 1438-1456页

作者： TIAN Qing-lan HE Lian-hua LIAO Shuang LI Wu DENG Fei ZHOU Wei ZHONG Xiao-yuan REN Wan-jun 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 UniversityChengdu 611130P.R.China Biotechnology Research Institute Guangxi Academy of Agricultural SciencesNanning 530007P.R.China

The yield and nitrogen use efficiency(NUE)of hybrid rice combinations are closely related to restorer ***,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 *** to address this issue,we conducted two filed experiments using three nitrogen applications,which screened five HYHN restorer lines from 15 indica restorer ***,NUE and nutrient transportation of restorer lines with different yields and NUE types were *** and total nitrogen absorption in aboveground biomass(TNA)increased,whereas NUE for grain production decreased with increasing nitrogen application *** HYHN restorer lines had large spikelets and high weight per panicle that were significantly positively correlated with yield and ***,large sink potential may be beneficial for both yield and *** 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 ***,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 ***,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.

关键词： indica hybrid rice restorer lines grain yield nitrogen-use efficiency sink potential nutrient transportation

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