Production of Haploid Plant of 'Banpeiyu' Pummelo [Citrus maxima (Burm.) Merr.] by Pollination with Soft X-Ray-Irradiated Pollen

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  • 軟 X 線照射花粉の受粉によるブンタン［<i>Citrus maxima</i>（Burm.）Merr.］‘晩白柚’の半数体の作出

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To induce haploid plants in Citrus maxima (Burm.) Merr. ‘Banpeiyu’, we evaluated the effect of pollination with soft X-ray-irradiated pollen on fruit set and seed development, and carried out ovule culture. When ‘Banpeiyu’ pummelo pistils were pollinated with X-ray-irradiated pollen of ‘Fukuhara’ sweet orange [C. sinensis (L.) Osbeck], the exposure doses affected the fruit set. The number of seeds per fruit was also affected by the exposure dose, and tended to decrease as the dose increased; however, all developed seeds obtained from these crosses were diploid. In the ovule culture of ‘Banpeiyu’ pummelo, six embryoids shown haploidy were obtained in all treatments. One haploid plantlet with 9 chromosomes was regenerated from an embryoid in a culture of ovules established 40 days after pollination with 400 Gray (Gy)-irradiated pollen of ‘Tosa-buntan’ pummelo (C. maxima). This haploid was suggested to be derived from ‘Banpeiyu’ pummelo by random amplified polymorphic DNA (RAPD) and cleaved amplified polymorphic sequence (CAPS) analysis.<br>

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