Conservation of genetic diversity hotspots of the high-valued relic yellowhorn ( Xanthoceras sorbifolium ) considering climate change predictions.

Autor: Zhu RB; Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Menglun China.; College of Resource and Environment Northwest A&F University Yangling China., Wang Q; School of Nature Conservation Beijing Forestry University Beijing China.; Department of Forest and Conservation Sciences, Faculty of Forestry The University of British Columbia Vancouver British Columbia Canada., Guan WB; School of Nature Conservation Beijing Forestry University Beijing China., Mao Y; Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Menglun China., Tian B; Key Laboratory of Biodiversity Conservation in Southwest China State Forestry Administration, Southwest Forestry University Kunming China., Cheng JM; College of Resource and Environment Northwest A&F University Yangling China.; Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water resources Yangling China., El-Kassaby YA; Department of Forest and Conservation Sciences, Faculty of Forestry The University of British Columbia Vancouver British Columbia Canada.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2019 Mar 01; Vol. 9 (6), pp. 3251-3263. Date of Electronic Publication: 2019 Mar 01 (Print Publication: 2019).
DOI: 10.1002/ece3.4944
Abstrakt: Genetic structure and major climate factors may contribute to the distribution of genetic diversity of a highly valued oil tree species Xanthoceras sorbifolium (yellowhorn). Long-term over utilization along with climate change is affecting the viability of yellowhorn wild populations. To preserve the species known and unknown valuable gene pools, the identification of genetic diversity "hotspots" is a prerequisite for their consideration as in situ conservation high priority. Chloroplast DNA (cpDNA) diversity was high among 38 natural populations ( H d  = 0.717, K  = 4.616, Tajmas' D  = -0.22) and characterized by high genetic divergence ( F ST  = 0.765) and relatively low gene flow ( N m  = 0.03), indicating populations isolation reflecting the species' habitat fragmentation and inbreeding depression. Six out of the studied 38 populations are defined as genetic diversity "hotspots." The number and geographic direction of cpDNA mutation steps supported the species southwest to northeast migration history. Climatic factors such as extreme minimum temperature over 30 years indicated that the identified genetic "hotspots" are expected to experience 5°C temperature increase in next following 50 years. The results identified vulnerable genetic diversity "hotspots" and provided fundamental information for the species' future conservation and breeding activities under the anticipated climate change. More specifically, the role of breeding as a component of a gene resource management strategy aimed at fulfilling both utilization and conservation goals.
Competing Interests: None declared.
Databáze: MEDLINE
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