ISSN:
1439-0523
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Geographical variation of growth habit was studied for 749 landraces from various parts of the world, with special reference to their adaptation and ecogeographical differentiation. The total frequency of spring-type landraces was 49.9%, and varied between localities. Spring-type landraces were frequent in two distinct areas where the average January temperature was either below -7°C or above 4°C, with winter-type landraces in areas from -7°C to 4°C. These results indicated that geographical variation of growth habit is closely related to the degree of winter coldness. An analysis of the Vrn genotype for 216 spring-type landraces demonstrated the uneven distribution of four Vrn genes, with Vrn4 being the least frequent. The adaptive Vrn genotype was different between localities. Genotypes carrying Vrn-A1 and additional Vrn gene(s) were frequent in two distinct areas where the average January temperature was either below -7°C or over 10°C, while genotypes with any of three Vrn genes, except Vrn-A1, adapted to areas with temperatures from 4°C to 10°C. Therefore, it was concluded that the adaptability of wheat landraces differed depending on their growth habit and Vrn genotype, and that ecotypes with different Vrn genotypes were allopatrically distributed as a result of adaptation to different winter temperature. However, the differential distribution of Vrn-B1, Vrn-D1 and Vrn4 could not be explained by their adaptability, and might reflect the polyphyletic origin of common wheat.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1439-0523.2001.00574.x
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