Theme 12: Forage Breeding and Genetics

Description

Narrowleaf birdsfoot trefoil (Lotus glaber Mill.) is an important forage legume which has spread widely and naturalized in the grasslands of the Depressed Pampas of the Province of Buenos Aires, Argentina. L. glaber is an alogamic diploid species with a low number of chromosomes (2n=2x= 12). These features show it as a species through which induced autopolyploids by colchicine-doubling of seedlings can be obtained. In this paper, we comparatively analyze fertility and size pollen grain, stomata length, central leaflet length and width and central leaflet ratio width/length in diploid plants and induced-autotetraploid plants of L. glaber. The results show that all the characters that were evaluated are useful to differentiate tetraploid plants in this species. Among these, the length of stomata would be the most profitable since it would allow for an early tetraploid level selection.

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Differences between Diploid and Induced Tetraploid Lotus glaber Mill. (Lotus tenuis Waldst. & Kit.) Plants

Narrowleaf birdsfoot trefoil (Lotus glaber Mill.) is an important forage legume which has spread widely and naturalized in the grasslands of the Depressed Pampas of the Province of Buenos Aires, Argentina. L. glaber is an alogamic diploid species with a low number of chromosomes (2n=2x= 12). These features show it as a species through which induced autopolyploids by colchicine-doubling of seedlings can be obtained. In this paper, we comparatively analyze fertility and size pollen grain, stomata length, central leaflet length and width and central leaflet ratio width/length in diploid plants and induced-autotetraploid plants of L. glaber. The results show that all the characters that were evaluated are useful to differentiate tetraploid plants in this species. Among these, the length of stomata would be the most profitable since it would allow for an early tetraploid level selection.