›› 2017, Vol. 29 ›› Issue (8): 1228-1233.DOI: 10.3969/j.issn.1004-1524.2017.08.02

• Crop Science • Previous Articles     Next Articles

Biological characteristics and utilization of new combinations in inter-subspecific crosses of rice

XU Weidong1, LI Guan2, CAI Jinyang1, YANG Yaocheng1   

  1. 1. Jiaxing Academy of Agricultural Sciences, Jiaxing 314016, China;
    2. China National Rice Research Institute, Hangzhou 310006, China
  • Received:2017-03-08 Online:2017-08-20 Published:2017-09-06

Abstract: With utilization of the subspecies heterosis, the mid-japonica CMS line Chunjiang23A were crossed with six newly developed indica restorers and the biological characteristics such as agronomic traits and grain quality of the six combinations were investigated. The results showed that the duration from sowing to heading of the six hybrid combinations were significantly shorter than the control (CK) Liangyoupeijiu, and the plant height, the panicle length and the panicle number per plant were lower or less than CK, whereas the grain number per panicle and yield per plant were higher than CK. Identification of Cheng‘s indexes indicated that the six restorers belonged to the indicalinous. The results of molecular marker screening showed that five restorer lines had S5-n gene except the line Hm9175. The investigation of the grain quality showed that the combinations of Chunjiang23A/Hm9169 and Chunjiang23A/Hm9179 had better appearance qualities compared with the CK, and the amylose content of all the combinations showed no significant differences compared with the CK. The combinations developed from japonica cytoplasmic male sterility line and the indica-japonica intermediate type restorer lines showed strong hybrid subspecies heterosis and the grain yield increased obviously. However, the grain quality of the indica-japonica rice was still to be upgraded and improved.

Key words: rice, indica-japonica hybrid, agronomic traits, grain quality

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