Dry Matter Production and Carbohydrate Translocation in Some Improved Rice Lines Developed from Cv. Khang Dan 18

Abstract

     A pot experiment was conducted in the green house at Viet Nam National University of Agriculture in 2014 autumn season to evaluate the dry matter accumulation and translocation of the non-structure carbohydrates of some improved rice lines (D1, D2, D3, D4 and D5). These lines were developed from a combination between a popular rice variety-Khang Dan 18 (KD18) and TCS3 and selected for short growth duration and high grain yield. The results showed that the growth duration of all improved lines were 10-11 days shorter than that of KD18. The rates of the non-structure carbohydrate translocation from culms to panicles and the rate of filled-grain of the lines D1, D4 and D5 were higher than those of KD18. There was a close positive correlation between individual grain yield and the total dry matter weight at the tillering stage and the CO₂ exchange rate at the dough-ripening stage. Although the growth duration of improved lines rice was shorter than that of KD18, their individual grain yields were similar to that of KD18 (D1 and D4) or even higher (D5). Therefore, the accumulative grain yield of these improved lines was higher than that of KD18.