首页|Grain yield, nitrogen use effciency and physiological performance of indica/japonica hybrid rice in response to various nitrogen rates

Grain yield, nitrogen use effciency and physiological performance of indica/japonica hybrid rice in response to various nitrogen rates

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Utilizing the heterosis of indica/japonica hybrid rice (IJHR) is an effective way to further increase rice grain yield. Rational application of nitrogen (N) fertilizer plays a very important role in using the heterosis of IJHR to achieve its great yield potential. However, the responses of the grain yield and N utilization of IJHR to N application rates and the underlying physiological mechanism remain elusive. The purpose of this study was to clarify these issues. Three rice cultivars currently used in rice production, an IJHR cultivar Yongyou 2640 (YY2640), a japonica cultivar Lianjing 7 (LJ-7) and an indica cultivar Yangdao 6 (YD-6), were grown in the field with six N rates (0, 100, 200, 300, 400, and 500 kg ha–1) in 2018 and 2019. The results showed that with the increase in N application rates, the grain yield of each test cultivar increased at first and then decreased, and the highest grain yield was at the N rate of 400 kg ha–1 for YY2640, with a grain yield of 13.4 t ha–1, and at 300 kg ha–1 for LJ-7 and YD-6, with grain yields of 9.4–10.6 t ha–1. The grain yield and N use effciency (NUE) of YY2640 were higher than those of LJ-7 or YD-6 at the same N rate, especially at the higher N rates. When compared with LJ-7 or YD-6, YY2640 exhibited better physiological traits, including greater root oxidation activity and leaf photosynthetic rate, higher cytokinin content in the roots and leaves, and more remobilization of assimilates from the stem to the grain during grain filling. The results suggest that IJHR could attain both higher grain yield and higher NUE than inbred rice at either low or high N application rates. Improved shoot and root traits of the IJHR contribute to its higher grain yield and NUE, and a higher content of cytokinins in the IJHR plants plays a vital role in their responses to N application rates and also benefits other physiological processes.

indica/japonica hybrid ricegrain yieldnitrogen use effciencycytokininsnon-structural carbohydrateroot activity

ZHOU Qun、YUAN Rui、ZHANG Wei-yang、GU Jun-fei、LIU Li-jun、ZHANG Hao、WANG Zhi-qin、YANG Jian-chang

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Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops,College of Agriculture,Yangzhou University,Yangzhou 225009,P.R.China

国家自然科学基金江苏高校优势学科建设工程项目Postgraduate Research and Innovation Program of Jiangsu Province,ChinaTop Talent Supporting Program of Yangzhou University,China

32071943PAPD-2020-01XKYCX17_0522015-01

2023

10.1016/j.jia.2022.08.076

农业科学学报(英文)
中国农业科学院农业信息研究所

农业科学学报(英文)

CSTPCDCSCD北大核心
影响因子：0.576
ISSN：2095-3119
年,卷(期)：2023.22(1)
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