NDLI: Ecological and selective effects of stigma-anther separation in the self-incompatible tropical tree Ipomoea wolcottiana (Convolvulaceae)

Content Provider	Springer Nature Link
Author	Parra Tabla, V. Bullock, S. H.
Copyright Year	2005
Abstract	We evaluated the effect of stigma-anther separation (SAS) in flowers of the self-incompatible tropical tree Ipomoea wolcottiana (Convolvulaceae). We measured the deposition of self pollen on the stigma and the growth of pollen tubes. We also evaluated phenotypic selection on female fertility using univariate regressions of SAS with fruit production. SAS varied among individuals in two years, with a range of 0–6 mm. There was a negative correlation between SAS and the number of self pollen grains on the stigma; trees with SAS of 0–2 mm received averages of ca 80–130 self grains. The effect of loading the stigma with self-pollen was tested by allowing isolated flowers to self-pollinate, then cross-pollinating by hand: there was a negative correlation between the pollen load and the proportion of grains forming pollen tubes. The highest proportion of grains forming tubes was found with loads of <10 grains, while the minimum frequency of tubes occurred with loads of >50 grains. The results suggest that more self pollen deposition leads to fewer tubes from outcross pollen. There was a significant effect of SAS on fruit production in both years. The analyses suggested stabilizing selection; very small SAS is disadvantageous due to the high load of self pollen, while very large SAS probably led to damage to the style during pollinator visits. We suggest that herkogamy may be a key character for determining the success of fruit production in self-incompatible hermaphroditic species.
Starting Page	85
Ending Page	95
Page Count	11
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	252
Issue Number	1-2
e-ISSN	16156110
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-03-24
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Herkogamy Ipomoea wolcottiana (Convolvulaceae) México pollen load phenotypic selection self pollination tropical tree Plant Ecology Plant Sciences Plant Anatomy/Development Plant Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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