Effectiveness of an indoor miniature seed orchard arranged in lines for Cryptomeria japonica retaining male-sterile genes
2009
Saito, M.(Toyama-ken. Agricultural, Forestry and Fisheries Research Center, Tateyama (Japan). Forestry Research Inst.)
In this study, a miniature seed orchard was developed in a closed glass room, in which homogeneous genotypes with male-sterile genes (aa) and heterozygous genotypes (Aa), respectively as seed parent and pollen parent, were arranged in lines. Efflorescence of male flowers of pollen parent (Aa) started on February 16th, which was 19 days prior to the natural pollen dispersal, following female flowers of seed parents (aa) which flowered on February 12th. Both reached a peak toward the end of the month. On the contrary, continuous pollen dispersal was not observed in the field until March 7th, with the pollen count peaking on March 21st which lagged three weeks from the orchard. The germination rate of seeds from the orchard was 22.8%, which was close to that of the average for Cryptomeria japonica (15-35 %). Given that the seedlings then steadily grew and developed, favorably not so much different from those produced in existing orchards, and that the appearance ratio of male-sterile seedlings was 47.3% as anticipated, it was concluded that the orchard was effective in producing male-sterile seedlings.
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