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Self‐incompatibility and floral parameters in Hypochaeris sect. Hypochaeris (Asteraceae)
Author(s) -
Ortiz Maria Ángeles,
Talavera Salvador,
GarciaCastaño Juan Luis,
Tremetsberger Karin,
Stuessy Tod,
Balao Francisco,
CasimiroSoriguer Ramón
Publication year - 2006
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.3732/ajb.93.2.234
Subject(s) - biology , botany , interspecific competition , population , asteraceae , sociology , demography
We studied the relationships between self‐incompatibility mechanisms and floral parameters in the genus Hypochaeris L. sect. Hypochaeris (consisting of H. glabra , H. radicata , H. arachnoidea , and H. salzmanniana ). We assessed at intra‐ and interspecific levels (1) the self‐incompatibility (SI) mechanism and its distribution among populations, (2) the relationship between SI and floral parameters, and (3) the relationship of SI to reproductive success. Hypochaeris salzmanniana is semi‐incompatible, H. glabra is self‐compatible, and H. arachnoidea and H. radicata are self‐incompatible. Floral parameters differed among populations of H. salzmanniana : plants in self‐compatible populations had fewer flowers per head, a smaller head diameter on the flower, and a shorter period of anthesis than self‐incompatible populations. We also detected this pattern within a semi‐compatible population of H. salzmanniana , and these differences were also found between species with different breeding mechanisms. Fruit to flower ratio in natural populations was generally high (>60%) in all species, regardless of breeding system. It is hypothesized that self‐compatibility may have arisen through loss of allelic diversity at the S locus due to bottleneck events and genetic drift.