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本文分析了１６个水稻籼型（或籼粳中间型）光温敏不育系、两个光温敏不育系的杂交组合后代花粉育性、自交结实率与包颈长度的关系．结果表明，水稻籼型（或籼粳中间型）光温敏不育系的不育性与包颈长度呈极显著的相关，即包颈长度越大，不育度越高．根据包颈长度判断花粉育性程度可作为水稻籼型（或籼粳中间型）光温敏不育系田间选择的重要参考指标．
In this paper, the relationships between pollen fertility, selfed seed setting rate and neck length of 16 indica (or indica-japonica intermediate) photoperiod-sensitive genic male sterile lines and two thermo-sensitive genic male sterile lines were analyzed. The results showed that the male sterility of indica (or indica-japonica intermediate) photo-thermo-sensitive genic male sterile rice was significantly correlated with the length of the neck, that is, the larger the length of the neck, the higher the sterility. Judging the degree of pollen fertility according to the length of the neck may be an important reference for the field selection of indica (or indica-japonica intermediate) photo-thermo-sensitive genic male sterile lines.