Abstract:

The aim was to explore the growth and development characteristics of ‘Si te’ late indica rice and provide theoretical support for its promotion and application. Many years field tests were conducted, with the typical ‘Si te’ late indica rice variety ‘Xiyou 447’ and the main rice variety ‘Jinyou 207’ in the middle and lower reaches of Yangtze River as experimental materials. Yield and growth characteristics were measured and breeding progress of ‘Si te’ late indica rice was summarized. Whole growth period of ‘Xiyou 447’ was 3-5 days shorter than that of ‘Jinyou 207’, and yield was increased by 7.5%-19.4%. Yield advantage of ‘Xiyou 447’ was mainly due to its synergistic improvement of dry matter accumulation and harvest index, as well as the higher total grain number per spike. The initial and terminal time of fast accumulation period of dry matter, nitrogen, phosphorus and potassium of ‘Xiyou 447’ were later than ‘Jinyou 207’, and mean accumulation speed was higher than ‘Jinyou 207’. Methane emission flux of ‘Xiyou 447’ was higher than ‘Jinyou 207’ at vegetative growth stage, but lower than ‘Jinyou 207’at heading and filling stage. In addition, ‘Xiyou 447’ had higher lodging resistance, which was mainly due to its lower plant height, shorter basal internode and higher stem wall thickness. ‘Si te’ late indica rice has short growth period, high yield, low methane emission and strong lodging resistance, so it has a good prospect for promotion and application.

Key words: late indica rice, breeding, yield, growth period, dry matter, methane emission, growth and development characteristics, lodging resistance