The origin of P.hopeiensis and P.tomentosa

• 作 者: Wang Dongsheng Wang Zhaoshan Kang Xiangyang Zhang Jianguo
• 机 构: State Key Laboratory of Tree Genetics and Breeding,Key Laboratory of Tree Breeding and Cultivation o
• 出 处: 第5届中国林业学术大会
• 发表日期: 2017年4期
• 关键词: section Leuce P.hopeiensis P.tomentosa phylogeny hybrid origin introgression

　　P.hopeiensis and P.tomentosa are endemic to China with high quality timber and long life.They are referred to as hybrids,but there are many contradictions on its origin.All the species of section Leuce distributed in Eurasia are hypothesized as the parents of them varying different studies.To reveal the origin of P.hopeiensis and P.tomentosa,392 individuals in 36 populations of 8 species(hybrids)are analyzed with 10 nuclear DNA and 6 chloroplast DNA.The observed genetic structure and simulation analyses supported the hybrid hypothesis.These data,together with previous cpDNA results suggest that P alba and P.davidian act as the paternal and maternal parents for P.hopeiensis respectively.It arises in 1.37Mya,with the most are Fi,except two individuals are F2.It is real amazing that two types(mb1 and mb2)with different evolutionary histories exist in P.tomentosa.P.adenopoda hybridize with P.alba to generate P.tomentosa mb1 in 0.58Mya.While it hybridize with P.davidiana firstly then with P.alba to generate P.tomentosa mb2 in 0.90Mya.P.alba is the same paternal parent for both two types,but they have different maternal parent,P.adenopoda for mb1,and P.davidiana for mb2.New hybrids indicates that all the P.tomentosa mb1 individuals are F1.It is the first time to explore the detailed origin and demographic history of them in molecular level.