Electronic Resource
Springer
Plant systematics and evolution
150 (1985), S. 291-301
ISSN:
1615-6110
Keywords:
Angiosperms
;
Linaceae
;
Linum tenuifolium
;
Breeding system
;
heterostyly
;
self-incompatibility
;
pollen production
;
seed-set
;
colonization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Distyly inLinum tenuifolium L. is associated with a high degree of self-incompatibility. Breakdown in this system has occurred without the morphological rearrangement expected as the result of cross-over within the distyly supergene. Pollen-flow in both distylous and monomorphic populations is leptokurtic. A high proportion of intra-flower pollination occurs. Pollen production per ovule is reduced in the self-compatible race. Mean seed-set is increased. Individuals of the self-compatible race produce less vegetative growth and require a shorter time to reach reproductive maturity under cultivation. Increased fecundity appears to provide the selective advantage promoting the breakdown of self-incompatibility in this species. This is achieved through a massive shift of resources toward female reproductive function in plants of the monomorphic race. Subsequent colonization by this race has led to its increased distribution in C. & S. Europe.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00984203
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