TAILIEUCHUNG - Báo cáo sinh học: "Vernalization in cereals"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Vernalization in cereals. | Journal of Biology BioMed Central Minireview Vernalization in cereals Elizabeth S Dennis and W James Peacock Address CSIRO Plant Industry GPO Box 1600 Canberra ACT 2601 Australia. Correspondence Elizabeth S Dennis. Email Published 22 June 2009 Journal of Biology 2009 8 57 doi jbiol156 The electronic version of this article is the complete one and can be found online at http content 8 6 57 2009 BioMed Central Ltd Abstract How vernalization - exposure to a period of cold - induces flowering in Arabidopsis has been intensively investigated at the genetic and moleular levels. Recent papers including one in BMC Plant Biology shed light on changes in gene regulation that occur on vernalization in cereals. Flowering is a critical stage in the life history of a plant. The time to flower must coincide with favorable conditions so that viable seeds can be produced ensuring the continued survival of the species in subsequent generations. Vernalization a prolonged period of low temperature is one environmental stimulus that ensures that flowering occurs in the appropriate season of the year - spring - and many plant species including both broadleaf plants the dicots and grass-like plants the monocots require vernalization to stimulate flowering 1 . Those plants that need vernalization often require an additional environmental cue long daylength to ensure that flowering occurs in spring. The environmental cues of vernalization and long days act sequentially and in concert to promote spring flowering. As the location of a plant is fixed its life cycle needs to fit the annual cycle of the regional climate. In the temperate regions of the planet where there are distinct seasonal variations in both temperature and daylength plant species have evolved responses that ensure that their life cycle particularly the shift from vegetative to reproductive growth fits the annual climate cycle such that flowering and seed formation occur at the most .

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