Impact of Rapeseed Sequential Follow Paddy Crop on Its 2-Acetyl-1-pyrroline Biosynthesis and Economic Yield under the Double-Cropping System

Author:

Yi Wentao123,Luo Haowen123ORCID,Zhang Mingliang4,Sun Zhigui4,Gu Qichang123,Deng Sicheng123,Wu Yizhu123,Yan Yugang5,Chen Zisheng4,Qi Jianying123ORCID,Liu Dongfeng4,Tang Xiangru123ORCID

Affiliation:

1. State Key Laboratory for Conservation and Utilization of Subtropical Agricultural Bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China

2. Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, Guangzhou 510642, China

3. Guangzhou Key Laboratory for Science and Technology of Aromatic Rice, Guangzhou 510642, China

4. Shenzhen Agricultural Science and Technology Promotion Center, Nanshan, Shenzhen 518000, China

5. College of Agriculture, South China Agricultural University, Guangzhou 510642, China

Abstract

Rapeseed–rice rotation is a cropping system that improves the land-use rate. The present study conducted a field experiment with winter planting of rapeseed as treatment (WR) and winter fallow as control (CK) to investigate the effects of winter planting of rapeseed on growth, yield formation, and 2-acetyl-1-pyrroline (2-AP) biosynthesis of fragrant rice in the two subsequent cropping seasons. The results show that WR treatment improved alkali-hydro nitrogen and rapidly available phosphorus contents in soil. Compared with CK, WR treatment significantly increased grain yield and effective panicle number per plant by 21.16–27.26% and 7.33–21.24%, respectively. Higher net photosynthetic rate, leaf area index, and dry matter accumulation of fragrant rice plants were recorded in WR treatment and CK. Furthermore, compared with CK, WR treatment significantly increased grain 2-AP content, which could be explained by increased content of pyrroline-5-carboxylic acid, methylglyoxal, 1-pyrroline, and enhanced activity of proline dehydrogenase. In addition, future studies should be conducted at a molecular level to reveal the regulation mechanism in 2-AP biosynthesis of fragrant rice under conditions of winter planting of rapeseed.

Funder

National Natural Science Foundation of China

Special Rural Revitalization Funds of Guangdong Province

Guangzhou Science and Technology Project

Guangdong Basic and Applied Basic Research Foundation

Publisher

MDPI AG

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