Effects of Style Age on the Performance of Self and Cross Pollen in Campanula rapunculoides

Stephenson, Andrew G.; Winsor, James A.; Richardson, Thomas E.; Singh, Awtar; Kao, Teh Hui

doi:10.1007/978-1-4612-2958-2_18

Cited by 23 publications

(19 citation statements)

References 12 publications

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“…In our case this was truly so, since the results show us that C. thyrsoides is allogamous and selfincompatible like it has been recorded to be the most common reproductive mode of the genus (Nyman, 1993;Shetler, 1979). Moreover, the SI system of C. thyrsoides proved to be of gametophytic origin since the flowers pollinated with pollen from plants from the same seed family (sister mating) produced as many seeds as outcrossed flowers (called semi-compatibility), but the same has been documented for other species in the Campanulaceae (Richards, 1997;Steinbachs and Holsinger, 2002;Stephenson et al, 1992). The very low self-compatibility index (0.021 for spontaneous and hand-selfing) indicates that C. thyrsoides has a very strong SI system.…”

Section: Discussionmentioning

confidence: 70%

No inbreeding depression in an outcrossing alpine species: The breeding system of Campanula thyrsoides

Ægisdóttir

Jespersen

Kuss

et al. 2007

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Discussionmentioning

confidence: 70%

No inbreeding depression in an outcrossing alpine species: The breeding system of Campanula thyrsoides

Ægisdóttir

Jespersen

Kuss

et al. 2007

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…Consequences of limited pollen quantity (besides limited seed set) are a decrease in the quality of seed (lack of competition among pollen donors) or an increase in self-pollination (Bertin, 1990;Karoly, 1992;Richardson and Stephenson, 1992). Self-incompatible species receiving mostly self pollen will have reduced seed set due to either interference by self pollen or reception of inadequate compatible pollen (Silander and Primack, 1978;Garwood and Horvitz, 1985;Galen, Gregory, and Galloway, 1989;Whisler and Snow, 1992;Broyles and Wyatt, 1993).…”

Section: Discussionmentioning

confidence: 99%

Pollen Quantity and Quality as Explanations for Low Seed Set in Small Populations Exemplified by Eupatorium (Asteraceae)

Byers

1995

American Journal of Botany

116

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As plant populations decrease in size, reduced seed set may contribute to their ultimate extirpation. In this study, effects of pollen quantity and compatibility relationships (quality) on seed set were investigated in a rare species (Eupatorium resinosum) and a closely related common species (E. perfoliatum). The impact of pollen quantity was studied through pollen supplementation experiments in two populations of each species. Addition of pollen increased seed set only in the smaller population of E. resinosum. Compatibility relationships (pollen quality) were investigated in a diallel crossing experiment using ten genotypes from the same populations. Plants from the smaller population of E. resinosum were found to be 40% cross‐incompatible, which was higher than the larger population of E. resinosum and the two populations of E. perfoliatum, the latter showing signs of self‐compatibility in some individuals. In addition the variance in number of compatible matings per individual was higher in the smaller population of E. resinosum. These results are consistent with a computer simulation model that investigated the effect of small population size on S‐allele diversity. Sufficient pollination accompanied by a partial breakdown of the incompatibility system may account, in part, for the relative success of E. perfoliatum.

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“…Previous studies have shown that Campanula rapunculoides has a gametophytic self‐incompatibility system and an abundant stylar protein with a molecular weight, relative abundance, temporal and spatial distribution and RNase activity similar to that reported for the S ‐locus glycoproteins of the Solanaceae ( Richardson et al. , 1990 ; Stephenson et al. , 1992 ).…”

Section: Introductionmentioning

confidence: 99%

Phenotypic plasticity in the expression of self-incompatibility in Campanula rapunculoides

1998

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Plants with self‐incompatibly (SI) frequently exhibit variable expression of this trait. The study reported here investigates the breakdown of SI in a perennial bellflower (Campanula rapunculoides) using a standard quantitative genetics approach to examine the relative influences of genotype, prior fruit‐set and floral age on seed‐set from self‐pollinations with standardized pollen loads. Cross‐pollen was used on separate flowers for comparison. The results obtained indicate that genotype (clone) explained a significant amount of the total variation and plants with few developing fruits showed stronger expression of SI on young flowers, and weaker expression of SI on old flowers than plants with many fruits (fruit‐by‐floral‐age interaction, P<0.02). A second experiment determined that the stigmatic curling accompanying floral age does not influence expression of SI. A significant clone‐by‐floral‐age interaction suggests that continuous variation in self seed‐set of putatively SI species may be the result of genotype‐by‐environment interactions. It is concluded that SI is a phenotypically plastic trait in C. rapunculoides and its breakdown responds to conditions that are indicative of low pollinator activity.

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Effects of Style Age on the Performance of Self and Cross Pollen in Campanula rapunculoides

Cited by 23 publications

References 12 publications

No inbreeding depression in an outcrossing alpine species: The breeding system of Campanula thyrsoides

No inbreeding depression in an outcrossing alpine species: The breeding system of Campanula thyrsoides

Pollen Quantity and Quality as Explanations for Low Seed Set in Small Populations Exemplified by Eupatorium (Asteraceae)

Phenotypic plasticity in the expression of self-incompatibility in Campanula rapunculoides

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