The reproductive biology of Xanthoceras sorbifolia,an energy crop,was investigated through field observation,artifical pollination,anatomical techniques and fluorescence *** buds of *** emerge at the beginning of Marc...
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The reproductive biology of Xanthoceras sorbifolia,an energy crop,was investigated through field observation,artifical pollination,anatomical techniques and fluorescence *** buds of *** emerge at the beginning of March and flowers bloom in the following two months in Beijing,*** of individual trees lasts 25 to 30 days with the peak in the mid and late *** inflorescence belongs to raceme with 20 to 50 flowers,which develop *** breeding system of *** is andromonoecious,i.e.,hermaphroditic and male flowers appear on the same *** inflorescences bear entirely male flowers,and a few inflorescences develop varying proportions of male and hermaphroditic *** male flowers frequency is *** flowers have obviously reduced nonfunctional pistils and are incapable of setting *** pistils of male flower bear ovules prior to *** of five anthers in male flowers is asynchronous and anthers of only a few hermaphroditic flowers dehisce to shed pollens at *** the pollen grains of both male and hermaphroditic flowers are viable,germination frequency of pollen of the hermaphroditic flowers on stigmas is extremely *** most commonly observed visiting insects in this study area include honeybees,coccinellids and *** of the hermaphroditic flowers are receptive to self-and cross-pollens during the first 3 days of *** fruits merely come from cross-fertilization while the development of self-pollinated ovaries is arrested soon after initially expanded growth.A free-nuclear endosperm occurs in self-fertilized ovules before ***-celled proembryoes were occasionally observed in the self-fertilized ovules,but their development did not proceed and they degenerated after several *** study revealed the trait of self-sterility in *** for the first time.
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