Study on Genetics of Several Traits of Floral Organs in Hybrid Offspring of'Korla Fragrant Pear'and'Cuiguan'
[Objective]The flower and pollen characteristics of'Korla Fragrant Pear'and'Cuiguan'and their hybrid off-spring were studied in order to provide reference for the selection of pear pollination cultivars,germplasm innovation and later breeding work in production practice.[Methods]'Korla Fragrant Pear''Cuiguan'and their hybrid offspring were selected as experimental materials.The axillary flower bud ratio,the number of flowers per inflorescence,the number of stamens,and the diameter of corolla were investigated.The pollen quantity and pollen viability were measured for two consecutive years,and the genetic law was analyzed.The significant analysis of the pollen quantity and pollen viability measured in two years was car-ried out.The paraffin sections of the offspring without pollen shedding and some offspring with less pollen shedding were ob-served.[Results]Among the hybrids involved in the survey,although the pollen amount,pollen viability,and stamen number showed a general trend of degradation,the ultra-high affinity were 38.2%,11.1%,and 5.9%,respectively,and more or less ultra-high progeny offspring appeared,and there was also a certain potential for selecting superior lines.The ratio of axillary flower buds decreased in the progeny,with high cold resistance and high quality fruit potential.[Conclusion]In the hybrid combination of'Korla Fragrant Pear'×'Cuiguan',the ratio of axillary flower buds showed a certain degradation trend,the proportion of axillary flower buds in offspring decreased,and the probability of excellent fruit increased.Although the other three traits more or less also showed a certain trend of degradation,there were ultra-high progeny,and the pollen quantity with the highest their ultra-high affinity even reached 38.2%.At the same time,the coefficient of variation of the progeny was high,and the number of stamens with the lowest coefficient of variation was also 13.6%.The trait separation was extensive,and the combination had a high potential for breeding superior lines.There are three types of fertility progeny,normal develop-ment type,few grain empty shell type and complete abortion type by male fertile parents hybridization.
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