Differentiation in competitive ability and cold tolerance between diploid and tetraploid cultivars in Lolium perenne |
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Authors: | Shuichi Sugiyama |
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Institution: | (1) Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki 036, Japan |
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Abstract: | In a diploid grass, perennial ryegrass (Lolium perenne L.), many autotetraploid cultivars have been released and widely used
in many cool temperate countries. In this study, competitive ability and cold tolerance, which seem to be important factors
in determining geographical distribution and persistency of this species, were compared between six diploid and five autotetraploid
cultivars. The tetraploid cultivars had significantly higher competitive ability and lower cold tolerance than the diploid
cultivars. Furthermore, there was no overlap in the two traits between them. These results suggest that chromosome doubling
has a larger effect on competitive ability and cold tolerance than does the genetic difference between the populations within
a single ploidy level.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | autotetraploid cold tolerance competitive ability cultivars Lolium perenne |
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