ISSN:
1432-1432
Keywords:
Key words:Asarum—Dioscorea— Angiosperms — Evolution — Legumins — Seed proteins
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract. Analysis of legumin-encoding cDNAs from Dioscorea caucasica Lipsky (Dioscoreaceae) and from Asarum europaeum L. (Aristolochiaceae) shows that there is an especially methionine-rich legumin subfamily present in the lower angiosperm clades including the Monocotyledoneae. It is characterized by a methionine content of 3–4 mol% which is roughly triple the methionine proportion of most other legumins. These ``MetR'' legumins, if present, still have to be detected in the higher angiosperms including the important seed crops. Evolutionary analysis suggests that the MetR legumins are the result of a gene duplication allowing the differentiation of legumin genes according to their sulfur content. The duplication event must have taken place before the split into mono- and dicotyledonous plants but probably after the separation of angiosperms and gymnosperms.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00006098
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