@article{oai:teapot.lib.ocha.ac.jp:00034992,
 author = {Niizeki, Shigeya and 新関, 滋也},
 issue = {2},
 journal = {お茶の水女子大學自然科學報告},
 month = {Dec},
 note = {application/pdf, 紀要論文, The self-sterility in the triploid L. tigrinum has been investigated. The different steps in which the sterility mechanism acts are classified as follows. 1) The pre-pollination stage : The phenomenon seen in this step is the abortive or abnormal development of the male and female gametophytes. The triploidy causes irregular distribution of chromosomes in the spore cells, and the structural hybridity causes the deletion of chromosome fragments, which the results play important role in this step. 2) The post-pollination stage : The phenomenon in this step is the retardation of the pollen tube growth in the styles of the selfing. Some suppressing mechanism, distributed in the style increasingly downward, affects the pollen germination and the pollen tube growth. The female gametophytes are more viable than the male. The tetrasporic condition in the formation of female gametophytes and their nutritive dependence on sporophytes may be the factors of better development. Hypothetically the triploid L. tigrinum may have come through the stages of diploid self-fertility, diploid self-sterility, triploidization, and eventua\
lly triploid self-sterility.},
 pages = {37--66},
 title = {Some Considerations on the Self-sterility in the triploid Lilium tigrinum},
 volume = {12},
 year = {1961}
}