关键词: 多年生稻, 干物质, 光合特性, 产量, 产量潜力

Abstract: Perennial rice has been successfully bred by the clonal propagation characteristic via rhizome of Oryza longistaminata, can survive for many years. Yunda 107 is a perennial rice variety with high quality, selected through the cross of ‘Dianrui449//RD23/Oryza longistaminata’. In order to explore the yield potential of Yunda 107, an experiment was conducted in 2018 using high quality rice varieties Diantun 502, Dianrui 449 and Wendao 5 as controls. In the experiment, we investigated the traits such as growth period, dry matter accumulation, photosynthetic characteristics, yield and yield potential of each tested variety. The results showed that, the yield of Yunda 107 can reach 564.52 kg/667 m2, which increase by 25.94%, 5.41% and 2.93% compared with Diantun 502, Wendao 5 and Dianrui 449, respectively, and the difference is significant compared with Diantun 502. In terms of yield composition, the number of grains per panicle and the weight per thousand grains of Yunda 107 were higher than those of Wendao 5, Diantun 502 and Dianrui 449. The large number and size of grains were the main reason for its higher yield. At the same time, the net photosynthetic rate of flag leaves of Yunda 107 increased by 4.45%, 4.65% and 16.83%, compared with Diantun 502, Dianrui 449 and Wendao 5, respectively, with significant differences. Therefore, the main way to tap the yield potential of Yunda 107 is to increase the number of grains per panicle and the photosynthetic capacity of flag leaves after full heading, so as to accumulate more photosynthetic products, thereby increasing the biological yield at mature stage.

Key words: perennial rice, dry matter, photosynthetic characteristics, yield, yield potential.