气候变化是人类社会在21世纪面临的最严峻挑战之一.由于气候变化导致的地表平均温度升高、降水规律改变,以及极端事件发生频率和强度增加,正在严重威胁人类的生命与健康.1988年由世界气象组织和联合国环境规划署资助成立政府间气候变化...气候变化是人类社会在21世纪面临的最严峻挑战之一.由于气候变化导致的地表平均温度升高、降水规律改变,以及极端事件发生频率和强度增加,正在严重威胁人类的生命与健康.1988年由世界气象组织和联合国环境规划署资助成立政府间气候变化专门委员会(IntergovernmentalPanel on Climate Change, IPCC),旨在科学地评估气候变化及其对人类和自然系统的潜在影响,并提出有效的减排和适应方案以管理气候变化带来的风险.展开更多
Given the escalating impact of climate change on agriculture and food security,gaining insights into the evolutionary dynamics of climatic adaptation and uncovering climate-adapted variation can empower the breeding o...Given the escalating impact of climate change on agriculture and food security,gaining insights into the evolutionary dynamics of climatic adaptation and uncovering climate-adapted variation can empower the breeding of climate-resilient crops to face future climate change.Alfalfa(Medicago sativa subsp.sativa),the queen of forages,shows remarkable adaptability across diverse global environments,making it an excellent model for investigating species responses to climate change.In this study,we performed population genomic analyses using genome resequencing data from 702 accessions of 24 Medicago species to unravel alfalfa’s climatic adaptation and genetic susceptibility to future climate change.We found that interspecific genetic exchange has contributed to the gene pool of alfalfa,particularly enriching defense and stress-response genes.Intersubspecific introgression between M.sativa subsp.falcata(subsp.falcata)and alfalfa not only aids alfalfa’s climatic adaptation but also introduces genetic burden.A total of 1671 genes were associated with climatic adaptation,and 5.7%of them were introgressions from subsp.falcata.By integrating climate-associated variants and climate data,we identified populations that are vulnerable to future climate change,particularly in higher latitudes of the Northern Hemisphere.These findings serve as a clarion call for targeted conservation initiatives and breeding efforts.We also identified preadaptive populations that demonstrate heightened resilience to climate fluctuations,illuminating a pathway for future breeding strategies.Collectively,this study enhances our understanding about the local adaptation mechanisms of alfalfa and facilitates the breeding of climate-resilient alfalfa cultivars,contributing to effective agricultural strategies for facing future climate change.展开更多
文摘气候变化是人类社会在21世纪面临的最严峻挑战之一.由于气候变化导致的地表平均温度升高、降水规律改变,以及极端事件发生频率和强度增加,正在严重威胁人类的生命与健康.1988年由世界气象组织和联合国环境规划署资助成立政府间气候变化专门委员会(IntergovernmentalPanel on Climate Change, IPCC),旨在科学地评估气候变化及其对人类和自然系统的潜在影响,并提出有效的减排和适应方案以管理气候变化带来的风险.
基金supported by the earmarked fund for CARS(CARS-34)the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(ASTIP-IAS14)the Science Fund Program for Distinguished Young Scholars of the National Natural Science Foundation of China(Overseas)to Yongfeng Zhou.
文摘Given the escalating impact of climate change on agriculture and food security,gaining insights into the evolutionary dynamics of climatic adaptation and uncovering climate-adapted variation can empower the breeding of climate-resilient crops to face future climate change.Alfalfa(Medicago sativa subsp.sativa),the queen of forages,shows remarkable adaptability across diverse global environments,making it an excellent model for investigating species responses to climate change.In this study,we performed population genomic analyses using genome resequencing data from 702 accessions of 24 Medicago species to unravel alfalfa’s climatic adaptation and genetic susceptibility to future climate change.We found that interspecific genetic exchange has contributed to the gene pool of alfalfa,particularly enriching defense and stress-response genes.Intersubspecific introgression between M.sativa subsp.falcata(subsp.falcata)and alfalfa not only aids alfalfa’s climatic adaptation but also introduces genetic burden.A total of 1671 genes were associated with climatic adaptation,and 5.7%of them were introgressions from subsp.falcata.By integrating climate-associated variants and climate data,we identified populations that are vulnerable to future climate change,particularly in higher latitudes of the Northern Hemisphere.These findings serve as a clarion call for targeted conservation initiatives and breeding efforts.We also identified preadaptive populations that demonstrate heightened resilience to climate fluctuations,illuminating a pathway for future breeding strategies.Collectively,this study enhances our understanding about the local adaptation mechanisms of alfalfa and facilitates the breeding of climate-resilient alfalfa cultivars,contributing to effective agricultural strategies for facing future climate change.
