Abstract: Selected four cytoplasmic male sterile(CMS) lines and their maintainers(b-lines) with distinct characters of glume-gaping grains(CGG) as experimental materials under three seeding dates,the relationship between the meteorological factors during pollination stage and the CGG of CMS lines were studied.The results showed that the percentage of glume-gaping grain(PGG) of the same CMS lines was significantly different under the different seeding dates in the natural conditions.The meteorological factors had impact on CGG.The precipitation and relative humidity during polination stage were significantly positively correlated with PGG,while sunshine hours during pollination stage were negatively correlated with PGG.The CMS lines with similar CGG had same response to the temperature.The PGG of the CMS lines with heavy CGG was negatively correlated with the temperature,while the PGG of the CMS lines with light CGG was positively correlated with the temperature.The CMS lines with heavy CGG were more sensitive to meteorological factors than the CMS lines with light CGG.The different CMS lines had different sensitiveness to meteorological factors.The results provided the references for enhancing quality of the hybrid rice seed production through strengthening the field management.

Key words: Rice, Rice, Cytoplasmic male sterile(CMS) lines, Characters of glume-gaping grains, Meteorological factors