Cytological and genetical studies on male sterility inCryptomeria japonica D. Don |
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| Authors: | Maki Saito Hideaki Taira Yoshihiko Furuta |
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| Institution: | (1) Forest Experiment Station, Toyama Forestry and Forest Products Research Center, 930-1362 Toyama, Japan;(2) Course of Biosphere, Niigata University Graduate school of Science and Technology, 950-2181 Niigata, Japan;(3) Faculty of Agriculture, Gifu University, 501-1193 Gifu, Japan |
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| Abstract: | Genetic male sterility is a useful trait in plant breeding, especially in angiosperm crops such as corn, onion and carrot.
We found a male sterile sugi (Cryptomeria japonica D. Don) tree in Toyama, Japan. Pollen of sugi is one of the major causes of pollinosis in Japan. We carried out this research
in an attempt to make clear the characteristics and inheritance of this male sterility. Microsporogenesis of the male sterile
tree proceeded meiosis, however, the microspores collapsed after they were separated from pollen tetrads in locules, resulting
in complete male sterility. Most likely, ethylene evolution was responsible for male sterility expression. Full seed setting
in the male sterile tree indicated normal macrosporogenesis. Seeds obtained from crossing between male sterile and normal
lines showed relatively high level of germination and their seedlings grew vigorously. The somatic chromosome numbers of 241
germinated seeds, derived from the male sterile tree, were mostly 22, euploid. These results indicated that male sterile tree
was different from other similar previously reported trees with low pollen fertility, resulting from triploid or trisomics.
Probably, male sterility in sugi is either nuclear genetic male sterility or cytoplasmic male sterility.
The study was partially supported by Program for Promotion of Basic Research Actives for Innovative Biosciences. |
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| Keywords: | abortive pollen Cryptomeria japonica D Don diploid male sterility normal female fertility |
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