关键词: 双峰分布, 双峰分布

Abstract: Distant hybridization remains the most effective ways to introducing excellent germplasm of China origin rose into modern rose, and embryo abortion is the bottleneck of the ways. Therefore, in the test, the young, green and mature fruit were dissected and observed respectively after different pretreatment to study the ovule development characteristics of different stages and provide the theoretical basis for the implementation of the embryo rescue in rose. A new phenomenon was found in the experiment: two ovules formed in a single carpel in rose. The phenomenon prevailed in young fruit (15 days after flowering) in many rose varieties, growth situation of the two ovules were same at this stage; double- ovule was also observed in 30- 60 days after flowering, accompanied with the significantly reducing of its ratio, and one ovule developed normally but the other was in the abortion status. Also, it found that, two seeds in one mature achene germinated at the same time after a low-temperature sand reservoir, indicating the two ovules in the single ovary may normal develop and germinate under the right conditions.