The question of why only two species of vascular plant have colonized Antarctica has not been fully answered. This review is based on a series of parallel analyses of distribution, ecology, and adaptation on the morph...The question of why only two species of vascular plant have colonized Antarctica has not been fully answered. This review is based on a series of parallel analyses of distribution, ecology, and adaptation on the morphological, cellular, and molecular genetic levels, and addresses the causes of the exclusive adaptation of Deschampsia antarctica Desv. (Poaceae) and Colobanthus quitensis (Kunth) Bartl. The authors conclude that the unique distribution of these species, including the Antarctic Peninsula, is not related to the presence of any specific mechanisms of adaptation to the ex-treme environment, but rather is a result of a gradual adaptation of these taxa to the extreme conditions during the de-velopment of glacial events and wide distribution and a substantial seed bank which could ensure mosaic survival in some ice-free areas, as well as survival through several years of snow and ice cover. Glaciological, molecular, popula-tion and reproduction biology studies are still necessary to deepen our understanding of the timing of the colonization of the region by vascular plants. However, keeping in mind that molecular methods alone are unlikely to give exhaus-tive evidence, application of other adequate methods in the context of the history of Pleistocenic glaciation in the region is also necessary to answer the question.展开更多
Belgica antarctica(Diptera:Chironomidae),a brachypterous midge endemicto the maritime Antarctic,was first described in 1900.Over more than a century of study,a vast amount of information has been compiled on the speci...Belgica antarctica(Diptera:Chironomidae),a brachypterous midge endemicto the maritime Antarctic,was first described in 1900.Over more than a century of study,a vast amount of information has been compiled on the species(3750000 Google searchresults as of January 10,2021),encompassing its ecology and biology,life cycle and re-production,polytene chromosomes,physiology,biochemistry and,increasingly,omics.In2014,B.antarctica’s genome was sequenced,further boosting research.Certain develop-mental stages can be cultured successfully in the laboratory.Taken together,this wealthof information allows the species to be viewed as a natural model organism for studies ofadaptation and function in extreme environments.展开更多
文摘The question of why only two species of vascular plant have colonized Antarctica has not been fully answered. This review is based on a series of parallel analyses of distribution, ecology, and adaptation on the morphological, cellular, and molecular genetic levels, and addresses the causes of the exclusive adaptation of Deschampsia antarctica Desv. (Poaceae) and Colobanthus quitensis (Kunth) Bartl. The authors conclude that the unique distribution of these species, including the Antarctic Peninsula, is not related to the presence of any specific mechanisms of adaptation to the ex-treme environment, but rather is a result of a gradual adaptation of these taxa to the extreme conditions during the de-velopment of glacial events and wide distribution and a substantial seed bank which could ensure mosaic survival in some ice-free areas, as well as survival through several years of snow and ice cover. Glaciological, molecular, popula-tion and reproduction biology studies are still necessary to deepen our understanding of the timing of the colonization of the region by vascular plants. However, keeping in mind that molecular methods alone are unlikely to give exhaus-tive evidence, application of other adequate methods in the context of the history of Pleistocenic glaciation in the region is also necessary to answer the question.
文摘Belgica antarctica(Diptera:Chironomidae),a brachypterous midge endemicto the maritime Antarctic,was first described in 1900.Over more than a century of study,a vast amount of information has been compiled on the species(3750000 Google searchresults as of January 10,2021),encompassing its ecology and biology,life cycle and re-production,polytene chromosomes,physiology,biochemistry and,increasingly,omics.In2014,B.antarctica’s genome was sequenced,further boosting research.Certain develop-mental stages can be cultured successfully in the laboratory.Taken together,this wealthof information allows the species to be viewed as a natural model organism for studies ofadaptation and function in extreme environments.
