›› 2017, Vol. 29 ›› Issue (6): 864-873.DOI: 10.3969/j.issn.1004-1524.2017.06.02

• Crop Science • Previous Articles     Next Articles

Effects of water stress on yield and water use efficiency of near isogenic introgression lines of high-quality indica rice Chuanxiang 29B

ZHANG Hong1,2, ZHU Conghua2, LI Xingyue2, LI Qiyong2, YANG Wenyu1,*, REN Guangjun3,*   

  1. 1. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China;
    2. Institute of Plant Protection, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China;
    3. Crop Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066
  • Received:2016-12-26 Online:2017-06-20 Published:2017-09-07

Abstract: By pot experiments in greenhouse, the change characteristics in photosynthetic physiology, spike traits, grain traits, yield and yield components, and water use efficiency of near isogenic introgression lines were investigated, the relationships among the decreasing range of these indexes and drought tolerance of rice were analyzed under different water stress conditions. It was benefit to find the drought resistant material and the drought resistance identification index. The results showed that leaf net photosynthetic rate, spike length, neck-spike node, grain length, effective spike per plant, grain number per spike, seed setting rate, 1 000-garin weight, water use efficiency and drought resistance index of all the materials were significantly decreased with the increasing of the degree of water stress from seedling to maturity. In treatments T1 and T5, there were no significantly differences in grain yield of these tested materials. In treatments T2, T3 and T4, comparing with other materials, net photosynthesis rate, number of primary branches per spike, effective spike per plant, grain number per spike, seed setting rate, 1 000-grain weight, grain yield, harvest index and water use efficiency of C2 and C3 were much higher. In treatments T3 and T4, the drought resistance index of near isogenic introgression lines was significantly positively correlated to decreasing range of spike length and neck-spike node, and negative correlated to decreasing range of effective spike per plant, seed setting rate and water use efficiency. In summary, the drought resistance ability of C2 and C3 were significantly higher than any of other materials, and the higher yield could also be maintained under water stress. In the treatment T3 (0~30 cm soil water potential was -0.040~-0.045 Mpa) or T4 (0~30 cm soil water potential was-0.060~-0.065 Mpa), it was more accurate that the decreasing range of effective spike per plant, seed setting rate and water use efficiency were used as indicators for screening new material or combination with much stronger drought tolerance from seedling reviving to maturity.

Key words: rice, near isogenic introgression lines, water stress, net photosynthesis rate, water use efficiency

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