Effect of Planting Density and Irrigation Management on the Growth, Yield, and 2-acetyl-△1-pyrroline Content of Fragrant Rice
Journal of Soil Science and Plant Nutrition(2021)
摘要
Fragrant rice has excellent rice quality and considerable economic benefits. There are few reports on planting density and irrigation management on the yield and 2-acetyl-△1-pyrroline (2-AP) content of fragrant rice. In this study, 2 planting densities (3–4 and 6–7 seedlings hills −1 ) and 3 irrigations (farmers’ irrigation practice with mid-season drainage (FP), alternate wetting and drying irrigation (AWD) at the − 15 cm (AWD15), and − 25 cm (AWD25) threshold level for irrigation managements) were adopted to investigate the effects of planting density and irrigation management on growth, yield, 2-AP, synthetic precursors, and enzymes involved in 2-AP formation. The results showed that dry weight (DW), leaf area index (LAI), panicle number, and yield as well as the content of 2-AP, synthetic precursors, and enzymes activities involved in 2-AP biosynthesis increased in high-density. Compared with FP, AWD15 increases N concentration of leaves, LAI, net photosynthetic rate (Pn), seed setting rate, and 1000-grain weight, yet it has no effect on yield. Although AWD25 has a better effect on enhancing 2-AP, AWD25 reduces DW, LAI, Pn, yield, and yield components. Our results illustrated that 6–7 seedlings hills −1 and AWD15 are the superior water-saving methods for fragrant rice to increase the content of 2-AP and maintain yield.
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关键词
Fragrant rice, 2-acetyl-△1-pyrroline, Wetting and drying irrigation, Transplanting density, Yield
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