Diospyros L. is the largest, most widely distributed, and economically important genus of the family Ebenaceae. However, various researchers disagree on the number of species and geographical distribution of Diospyros...Diospyros L. is the largest, most widely distributed, and economically important genus of the family Ebenaceae. However, various researchers disagree on the number of species and geographical distribution of Diospyros in China. For the purpose of providing a scientific basis for the effective protection and rational use of Diospyros, the present study involved a comprehensive review of the literature, electronic databases, and herbaria as well as field investigations. The results showed as the following.(1) While 174 scientific names have been published for various taxa of Diospyros in China, by screening and excluding synonyms, 65 species names were considered acceptable; these account for about 12%of the total species of Diospyros globally.(2) A review of herbarium specimens documented that Diospyros occurs in 28 administrative regions of China, more than the literature records. Species richness decreases from south to north in China while Guangxi, Yunnan, Guangdong, and Hainan have the greatest number of species.(3) Among the 65 relatively reliable Diospyros species, 45 species are endemic to China and 18 species are stenochoric. Some species may have become extinct as a result of environmental degradation and the status of some germplasm remain unresolved. In brief, Chinese Diospyros includes abundant, China-specific, and widely distributed features. Nevertheless, comprehensive species delimitation and the analysis of phylogenetic relationships will still require further study.展开更多
Copy number variation(CNV)is the most prevalent type of genetic structural variation that has been recognized as an important source of phenotypic variation in humans,animals and plants.However,the mechanisms underlyi...Copy number variation(CNV)is the most prevalent type of genetic structural variation that has been recognized as an important source of phenotypic variation in humans,animals and plants.However,the mechanisms underlying the evolution of CNVs and their function in natural or artificial selection remain unknown.Here,we generated CNV region(CNVR)datasets which were diverged or shared among cattle,goat,and sheep,including 886 individuals from 171 diverse populations.Using 9 environmental factors for genome-wide association study(GWAS),we identified a series of candidate CNVRs,including genes relating to immunity,tick resistance,multi-drug resistance,and muscle development.The number of CNVRs shared between species is significantly higher than expected(P<0.00001),and these CNVRs may be more persist than the single nucleotide polymorphisms(SNPs)shared between species.We also identified genomic regions under long-term balancing selection and uncovered the potential diversity of the selected CNVRs close to the important functional genes.This study provides the evidence that balancing selection might be more common in mammals than previously considered,and might play an important role in the daily activities of these ruminant species.展开更多
基金supported by the Research Fund for the Doctoral Program of Higher Education (Grant No. 20110146110018)the China Postdoctoral Science Foundation (Grant No. 20110491172)the Special Fund for Agro-scientific Research in the Public Interest (Grant No. 201203047)
文摘Diospyros L. is the largest, most widely distributed, and economically important genus of the family Ebenaceae. However, various researchers disagree on the number of species and geographical distribution of Diospyros in China. For the purpose of providing a scientific basis for the effective protection and rational use of Diospyros, the present study involved a comprehensive review of the literature, electronic databases, and herbaria as well as field investigations. The results showed as the following.(1) While 174 scientific names have been published for various taxa of Diospyros in China, by screening and excluding synonyms, 65 species names were considered acceptable; these account for about 12%of the total species of Diospyros globally.(2) A review of herbarium specimens documented that Diospyros occurs in 28 administrative regions of China, more than the literature records. Species richness decreases from south to north in China while Guangxi, Yunnan, Guangdong, and Hainan have the greatest number of species.(3) Among the 65 relatively reliable Diospyros species, 45 species are endemic to China and 18 species are stenochoric. Some species may have become extinct as a result of environmental degradation and the status of some germplasm remain unresolved. In brief, Chinese Diospyros includes abundant, China-specific, and widely distributed features. Nevertheless, comprehensive species delimitation and the analysis of phylogenetic relationships will still require further study.
基金supported by the National Natural Science Foundation of China(31822052,31572381)the National Thousand Youth Talents Planthe Program of the National Beef Cattle and Yak Industrial Technology System(CARS-37)。
文摘Copy number variation(CNV)is the most prevalent type of genetic structural variation that has been recognized as an important source of phenotypic variation in humans,animals and plants.However,the mechanisms underlying the evolution of CNVs and their function in natural or artificial selection remain unknown.Here,we generated CNV region(CNVR)datasets which were diverged or shared among cattle,goat,and sheep,including 886 individuals from 171 diverse populations.Using 9 environmental factors for genome-wide association study(GWAS),we identified a series of candidate CNVRs,including genes relating to immunity,tick resistance,multi-drug resistance,and muscle development.The number of CNVRs shared between species is significantly higher than expected(P<0.00001),and these CNVRs may be more persist than the single nucleotide polymorphisms(SNPs)shared between species.We also identified genomic regions under long-term balancing selection and uncovered the potential diversity of the selected CNVRs close to the important functional genes.This study provides the evidence that balancing selection might be more common in mammals than previously considered,and might play an important role in the daily activities of these ruminant species.
