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观察了113个育性稳定的滇1型细胞质雄性不育系(A)及其保持系(B)的花时特性,结果表明,不育系与保持系的单穗花期为5～10 d,大部分材料为6～7 d;不育细胞质对花时有影响,94%的不育系花时较其相应保持系晚,平均晚约40 min;根据不育系和保持系的花时早晚、花时相遇情况等将其分为4种类型。提出滇1型粳稻不育系优良花时性状的2个评价指标:一是不育系的始盛花时间不迟于14:00;二是不育系的理论有效相遇颖花率在70%以上。
The flowering characteristics of 113 CMS lines (A) and maintainer line (B) with stable fertility were observed. The results showed that the flowering period of single spike of CMS line and maintainer line was 5 ~ 10 days, Most of the materials were from 6 to 7 days. The sterile cytoplasm affected the flowering time. 94% of the sterile lines spent about 40 min later than their corresponding maintainers, , When it meets the flowers will be divided into four types. Two evaluation indexes of excellent flowering-time traits of Dian 1 type japonica CMS line were proposed: one was the beginning of flowering time of CMS line no later than 14:00; the other was that the effective rate of spike rate of sterile line was above 70% .