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Basal internode elongation of rice as affected by light intensity and leaf area

文献类型： 外文期刊

作者： Zhong, Xuhua 1 ; Liang, Kaiming 1 ; Peng, Bilin 1 ; Tian, Ka 1 ; Li, Xiaojuan 1 ; Huang, Nongrong 1 ; Liu, Yanzhuo 1 ; Pa 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou 510640, Guangdong, Peoples R China; Guangdong Key Lab New Technol Rice Breeding, Guangzhou 510640, Guangdong, Peoples R China

关键词： Internode elongation; Leaf area index; Light intensity; Light quality; R/FR, Light transmission ratio; Leaf N concentration

期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）

ISSN： 2095-5421

年卷期： 2020 年 8 卷 1 期

页码：

收录情况： SCI

摘要： Short basal intemodes are important for lodging resistance of rice (Oryza sativa L.). Several canopy indices affect the elongation of basal intemodes, but uncertainty as to the key factors determining elongation of basal intemodes persists. The objectives of this study were (1) to identify key factors affecting the elongation of basal intemodes and (2) to establish a quantitative relationship between basal internode length and canopy indices. An inbred rice cultivar, Yinjingruanzhan, was grown in two split-plot field experiments with three N rates (0, 75, and 150 kg N ha(-1) in early season and 0, 90, and 180 kg N ha(-1) in late season) as main plots, three seedling densities (16.7, 75.0, and 187.5 seedlings m(-2) ) as subplots, and three replications in the 2015 early and late seasons in Guangzhou, China. Light intensity at base of canopy (L-b), light quality as determined from red/far-red light ratio (R/FR), light transmission ratio (LTR), leaf area index (LAI), leaf N concentration (NLV) and final length of second intemode (counted from soil surface upward) (FIL) were recorded. Higher N rate and seedling density resulted in significantly longer FIL. FIL was negatively correlated with L-b, LTR, and R/FR (P < 0.01) and positively correlated with LAI (P < 0.01), but not correlated with NLV (P > 0.05). Stepwise linear regression analysis showed that FIL was strongly associated with L-b and LAI (R-2 = 0.82). Heavy N application to pot-grown rice at the beginning of first intemode elongation did not change FIL. We conclude that FIL is determined mainly by L-b and LAI at jointing stage. NLV has no direct effect on the elongation of basal intemodes. N application indirectly affects FIL by changing LAI and light conditions in the rice canopy. Reducing LAI and improving canopy light transmission at jointing stage can shorten the basal intemodes and increase the lodging resistance of rice. (C) 2019 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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