Preliminary study on flowering characteristics and breeding system of water spinach
In order to solve the problem of infertility during flowering period and difficulty in sexual hybridization among water spinach varieties,the flowering characteristics and breeding system of four water spinach parents,namely Yuchang water spinach,Thai water spinach with large leaves,Rucheng water spinach,Changsha vine water spinach were observed,and the flowering period between water spinach varieties was regulated by 11 h·d-1 short day light.Sexual hybridization research was also conducted among water spinach varieties.The results showed that under natural photoperiod conditions,the budding period of water spinach was from August to November.After cutting and sprouting,short day light induced budding for 11 to 13 days,and the budding period lasted for about 11 days until flowering,with a single flower opening time of about 12 hours.On the day of flowering,from 09:00 to 13:00,the pollen vitality was highest,and from 11:00 to 13:00,the stigma had the strongest receptivity.The P/O value and OCI value of Yuchang water spinach are basically the same as those of Changsha vine water spinach,but Changsha vine water spinach showed poor self pollination in the con-trolled pollination experiment.The pollen grains are spherical or cap shaped,with a surface covered with spikes.The hy-brid seed setting rate using the seed water spinach variety as the maternal parent can reach to 75.00％,with a high seed setting rate.The hybrid fruiting rate of Changsha vine water spinach as the female parent can reach to 6.00％,and the seed setting rate is 0.Based on comprehensive analysis,it can be concluded that the water spinach breeding system tends to be a hybrid mating type,and the 11 h·d-1 short day treatment can achieve the encounter of flowering periods among water spinach varieties.The hybridization between water spinach varieties is compatible,but Changsha vine water spinach may have lost its ability to bear seeds.
Water spinachPhotoperiodFloral characteristicsBreeding systemPollen vitalityStigma acceptabilityHybrid breeding
万方数据
维普
