Evolution of mating systems inLycopersicon hirsutum as deduced from genetic variation in electrophoretic and morphological characters |
| |
Authors: | Charles M. Rick Jon F. Fobes Steven D. Tanksley |
| |
Affiliation: | (1) Department of Vegetable Crops, University of California, 95616 Davis, California, USA;(2) Department of Horticulture, Michigan State University, 48824 East Lansing, Michigan, USA |
| |
Abstract: | Populations in the central part of the distribution are mostly self-incompatible and tend to be highly variable for allozymic and morphological characters; those in the north and south limits are entirely self-compatible and tend to be genetically highly uniform. Gradations in variability are observed in the intermediate regions. Flower size tends to diminish in the peripheral areas. The extensive differences in genotype observed between the north and south marginal populations are not compatible with the concept of a single origin of self-compatibility, but suggest, along with other evidence, that the substitution of different alleles resulted from differentiation in the marginal areas from older, self-incompatible stocks of the central region. The conclusions regarding patterns of genetic variation and nature of evolution of mating systems inL. hirsutum conform to a remarkable extent with those reached previously forL. pimpinellifolium, a species that is distinct in morphology and ecological preferences yet has a similar latitudinal distribution. |
| |
Keywords: | Lycopersicon hirsutum Solanaceae Allozymes clinal variation electrophoresis evolution of mating systems isozymes self-incompatibility |
本文献已被 SpringerLink 等数据库收录! |
|