Identification of chromosome ploidy and analysis of breeding system of different Rosa odorata
[Objective]Rosa odorata is an important germplasm resource of Rosa,which has high value of appreciation and utilization.In order to promote the development and utilization of the germplasm re-sources,the chromosome ploidy,floral synthesis,and characteristics of breeding systems of different R.odorata were studied.[Methods]The chromosome ploidy,pollen vitality,stigma vitality,and flower characteristics of 9 R.odorata were observed and determined by flow cytometer and outcrossing analysis.We also analyzed the breeding systems.[Results](1)9 R.odorata were identified as diploid,and their flowers were bisexual with bright colors and mostly double or semi-double petals.Male and female flowers of 5 varieties were matured at different time.(2)9 R.odorata pollen vitalities were low,with the highest vitality of 35.47％.The outcrossing index(OCI)of all varieties was ≥4,and pollen volume-ovule ratio(P/O)values ranged from 6 709 to 75 521.[Conclusion]The breeding system of 9 R.odorata is mainly outcrossing,and the breeding system is affected by many factors,such as the number of pollen grains and petals.
Rosa odoratachromosome ploidyfloral syndromebreeding system
NETL
NSTL
万方数据
维普
