PJB-2018-104
Interspecific hybrid compatibility of HuaRen apricot with Almond
Han Zhao
Abstract
Interspecific hybridization is an effective method of fruit tree germplasm innovation. In order to understand interspecific hybridization affinity, abortive period, and the development of hybrid fruit from crosses between ‘HuaRen’ apricot and almond, we conducted crossing experiments. The growth condition of the pollen tube was observed by fluorescence electron microscopy, and the abortion rate and developmental characteristics of hybrid fruit were analyzed in different stages. The results showed that the pollen of ‘HuaRen’ apricot and almond were able to germinate, and that the pollen tubes can enter into the embryo sac of the other species. After four weeks of hybridization, the average fruit-setting rate of the interspecific hybrid was 7.47% using ‘HuaRen’ apricot as female parent, which was 29.07% of the intraspecific hybridization rate; mature fruit accounted for 20% of the young fruit. When almond was used as the female parent, the average fruit-setting rate of interspecific hybridization was 6.28%, which was 45.54% of the intraspecific hybridization, and the mature fruit accounted for 6.52% of the young fruit. However, the embryos were aborted after the fruit ripened. The fruit of interspecific hybrids with ‘HuaRen’ apricot as the female parent grew slower than that of the intraspecific hybrid. In addition, the fruit was smaller when mature and embryo development was normal in the former as compared with that in the latter. The fruit development after interspecific hybridization using almond as the female parent was consistent with that of the intraspecific hybrids. However, the embryonic development gradually stopped, and malformed and normal embryos could not be formed. There is a high potential for interspecific hybridization between ‘HuaRen’ apricot and almond. Particularly, using ‘HuaRen’ apricot as a female parent, a well-developed embryo can be obtained.
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