Regulation of 2-acetyl-1-pyrroline and grain quality in early-season indica fragrant rice by nitrogen and silicon fertilization under different plantation methods  

作　　者：Yongjian Chen Lan Dai Siren Cheng Yong Ren Huizi Deng Xinyi Wang Yuzhan Li Xiangru Tang Zaiman Wang Zhaowen Mo 

机构地区：[1]State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources,College of Agriculture,South China Agricultural University,Guangzhou 510642,China [2]Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology,Yulin Normal University,Yulin 537000,China [3]Key Laboratory for Conservation and Utilization of Subtropical Bio-Resources,Education Department of Guangxi Zhuang Autonomous Region/College of Biology and Pharmacy,Yulin Normal University,Yulin 537000,China [4]Scientific Observing and Experimental Station of Crop Cultivation in South China,Ministry of Agriculture and Rural Affairs,Guangzhou 510642,China [5]Guangzhou Key Laboratory for Science and Technology of Fragrant Rice,Guangzhou 510642,China [6]Key Laboratory of Key Technology for South Agricultural Machine and Equipment,Ministry of Education/College of Engineering,South China Agricultural University,Guangzhou 510642,China

出　　处：《Journal of Integrative Agriculture》2024年第2期511-535,共25页农业科学学报（英文版）

基　　金：This project was financially supported by the National Natural Science Foundation of China(31601244 and 31971843);the Guangdong Provincial Key Field Research and Development Plan Project,China(2019B020221003);the Modern Agricultural Industrial Technology System of Guangdong Province,China(2020KJ105).

摘　　要：Fragrant rice has a high market value,and it is a popular rice type among consumers owing to its pleasant flavor.Plantation methods,nitrogen(N)fertilizers,and silicon(Si)fertilizers can affect the grain yield and fragrance of fragrant rice.However,the core commercial rice production attributes,namely the head rice yield(HRY)and 2-acetyl-1-pyrroline(2-AP)content of fragrant rice,under various nitrogen and silicon(N-Si)fertilization levels and different plantation methods remain unknown.The field experiment in this study was performed in the early seasons of 2018 and 2019 with two popular indica fragrant rice cultivars(Yuxiangyouzhan and Xiangyaxiangzhan).They were grown under six N-Si fertilization treatments(combinations of two levels of Si fertilizer,0 kg Si ha^(−1)(Si0)and 150 kg Si ha^(−1)(Si1),and three levels of N fertilizer,0 kg N ha^(−1)(N0),150 kg N ha^(−1)(N1),and 220 kg N ha^(−1)(N2))and three plantation methods(artificial transplanting(AT),mechanical transplanting(MT),and mechanical direct-seeding(MD)).The results showed that the N-Si fertilization treatments and all the plantation methods significantly affected the HRY and 2-AP content and related parameters of the two different fragrant rice cultivars.Compared with the Si0N0 treatment,the N-Si fertilization treatments resulted in higher HRY and 2-AP contents.The rates of brown rice,milled rice,head rice,and chalky rice of the fragrant rice also improved with the N-Si fertilization treatments.The N-Si fertilization treatments increased the activities of N metabolism enzymes and the accumulation of N and Si in various parts of the fragrant rice,and affected their antioxidant response parameters.The key parameters for the HRY and 2-AP content were assessed by redundancy analysis.Furthermore,the structural equation model revealed that the Si and N accumulation levels indirectly affected the HRY by affecting the N metabolism enzyme activity,N use efficiency,and grain quality of fragrant rice.Moreover,high N and Si accumulation directly promoted

关 键 词：fragrant rice 2-AP content head rice yield mechanical planting NITROGEN silicon 

分 类 号：S511[农业科学—作物学]