
TY  - JOUR
A1  - Leeton, P 
A1  - Fripp, YJ 
T1  - Breeding System, Karyotype and Variation Within and Between Populations of <I>Rutidosis leptorrhynchoides</I> F Muell (Asteraceae, Inuleae)
JF  - Australian Journal of Botany
JO  - Aust. J. Bot.
Y1  - 1991
VL  - 39
IS  - 1
SP  - 85
EP  - 96
KW  - 
UR  - https://doi.org/10.1071/BT9910085 
N2  - The endangered plant species, Rutidosis leptorrhynchoides (button wrinklewort), is now known from only a few populations in each of two regions separated by approximately 500 km in south-eastern Australia. Plants were examined from several populations from each region. No differences in chromosome number or morphology were observed among plants or populations. All counts were diploid, 2n = 26. Viable progeny were obtained following self-pollination and allozyme analysis indicated that these progeny were the result of selfing and not agamospermy. This species is not an obligate outcrosser and does not have a classical pre-zygotic self-incompatibility system. However, outcross pollen may have an advantage over self pollen and this species may thus be preferentially outcrossing. The pollen: ovule ratios (mean 3186 &#177; 48.5) were consistent with this hypothesis. Allele frequencies at allozyme loci diferred little between populations, with an estimated 97% of the variation within populations. There was no correlation between genetic distance and geographic distance. In contrast, for the leaf dimensions of plants germinated and raised together in a glasshouse there were differences between plants from the two regions. It is recommended that populations from both regions should be conserved. 
ER  -

