Abstract:

Early ear phenomenon occurred in the breeding of dual-purpose nuclear sterile line, which not only affected the reproduction yield but also caused the difficulty of removing miscellaneous plants. Through the investigation and analysis of the causes of the early ear of the dual- purpose nuclear sterile line, it is related to the characteristics of varieties, climate reasons, environmental conditions and improper cultivation management. Effective measures should be taken to prevent early panicle, such as determination of suitable sowing date and seedling age, strictly control the sowing amount and improve seedling quality by fertilizing seedling field. Appropriate technical measures may also be adopted to remedy fields that may or have occurred early spikes.

Key words: rice dual- purpose nuclear sterile line , breeding , early ear , prevention and control techniques, remedial measure

摘要：

水稻两用核不育系繁殖中常出现早穗现象，既影响产量又造成除杂困难。通过对水稻两用核不育系早穗产生的原因调查和分析，发现早穗的出现与品种特性、气候、环境条件和栽培管理不当有关。采取“确定适宜播种期和秧龄、严格控制秧田播种量、培肥秧田提高秧苗素质”等措施可有效防治早穗的发生。对可能发生早穗或已发生早穗的田块，也可采用适当的技术措施进行补救。

关键词: 水稻两用核不育系, 繁殖, 早穗, 防治技术, 补救措施