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Selenium applications enhance 2-acetyl-1-pyrroline biosynthesis and yield formation of fragrant rice

文献类型： 外文期刊

作者： Luo, Haowen 1 ; He, Longxin 1 ; Lai, Rifang 1 ; Liu, Jinhai 1 ; Xing, Pipeng 1 ; Tang, Xiangru 1 ;

作者机构： 1.South China Agr Univ, Coll Agr, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Peoples R China

2.Minist Agr, Sci Observing & Expt Stn Crop Cultivat South Chin, Guangzhou 510642, Peoples R China

期刊名称：AGRONOMY JOURNAL （ 影响因子：2.24； 五年影响因子：2.829 ）

ISSN： 0002-1962

年卷期： 2021 年 113 卷 1 期

页码：

收录情况： SCI

摘要： Selenium (Se) is a beneficial element for plants and a necessary element for humans. Previous studies showed Se could increase 2-acetyl-1-pyrroline (2-AP) content in fragrant rice (Oryza sativa L.), but the underlying molecular mechanism remains largely unexplored. There are several methods for Se application in rice production, and it is not clear which is better. This study investigated the effects of three different Se application methods on 2-AP biosynthesis, yield formation, and grain Se concentration of fragrant rice through a four-season field experiment with two fragrant rice cultivars. For soil application, Se was applied as Se mineral powder as basal application to soil (36 g Se ha(-1)); for foliar application (FA), sodium selenate solution (40 mu mol L-1) was applied as a foliar spray at heading stage; and for seed priming, fragrant rice seeds were primed with sodium selenate at 80 mg kg(-1) concentration. The treatment without Se was taken as control (CK). The results showed Se applications increased grain 2-AP content and grain yield by 3.95-22.32% and 1.03-8.05%, respectively. Compared with CK, Se applications regulated transcript levels of genes PRODH, BADH2, DAO, OAT, and P5CS2, which are involved in 2-AP biosynthesis. Selenium applications also increased the contents of precursors (Delta 1-pyrroline, proline and pyrroline-5-carboxylic acid) and enhanced the activities of enzymes (proline dehydrogenase, o1-pyrroline-5-carboxylic acid synthetase, ornithine aminotransferase, diamine oxidase), which are related to 2-AP. Furthermore, Se applications increased grain Se concentration by 14.12-63.25%. The highest grain yield, grain 2-AP content, and grain Se concentration were all recorded in the FA treatment.

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