The influence of gametophytic competition on sporophytic quality in Dianthus chinensis

Mulcahy, David L.; Mulcahy, Gabriella Bergamini

doi:10.1007/bf00281149

Cited by 199 publications

(120 citation statements)

References 5 publications

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“…Although mixtures of pollen were not used for lack of appropriate markers to distinguish different genotypes, the assumptions of these findings should be weighed when mixtures of pollen are likely to be present, as in naturally pollinated flowers. The distinct competitive abilities found at style level in Q. suber and Q. ilex suggest modulation of genetic interactions by female tissues, resulting in reduced number of pollen tubes growing within the style, and presumably favouring genotypes with higher competitive abilities (Mulcahy and Mulcahy 1975;Schlicting et al 1987). Regardless of the strength of other internal barriers, we expect that pollen competition strongly increases assortative mating, providing a late-acting advantage to outcross pollen at the ovary level, as observed in several other species (Weller and Ornduff 1991;Williams et al 1999).…”

Section: Discussionmentioning

confidence: 98%

Sexual reproduction in the cork oak ( Quercus suber L). II. Crossing intra- and interspecific barriers

Boavida¹,

Silva²,

Feijó³

2001

Sexual Plant Reproduction

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Intraspecific barriers promote outcrossing while interspecific mechanisms may contribute to the isolation of species; both control the exchange of genes between plants. In this paper we establish that post-pollination mechanisms promote outcross and act at different temporal and spatial levels to control seed set and quality in Quercus species. Controlled pollinations were performed to investigate intraspecific crossing barriers in Q. suber and pollen-pistil interactions following interspecific pollinations with some simpatric Quercus species. Cytological data of intraspecific crosses in Q. suber and Q. ilex have shown different kinetics on pollen tube growth after self and outcross pollination, but pollen tubes were able to reach the base of the styles in both species and seed set was successful. Although some prezygotic interaction is occurring at the style, the most important interaction takes place at ovary. The cross between Q. ilex and Q. suber is possible only in one direction, revealing a case of unilateral incongruity. We show that the lack of seed set observed in the cross Q. suber × Q. ilex is due to the inability of pollen tubes to penetrate the transmitting tissue after germination. With Q. suber mainly as female parent, pollinations with other simpatric Quercus species have shown different levels of constraint on pollen tube progression at stigma and style levels. Eventual hybridisation between Quercus species will depend on the compatibility of pollen-pistil interactions, on the competitive ability of pollen genotypes, and, most important, on the overlapping of geographical, phenological and ecological factors. Differences in seed set and seed allocation was evident in all crosses, and was particularly outstanding in interspecific and in self intraspecific crosses, determining the ultimate level of seed production and quality in Quercus species.

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Section: Discussionmentioning

confidence: 98%

Sexual reproduction in the cork oak ( Quercus suber L). II. Crossing intra- and interspecific barriers

Boavida¹,

Silva²,

Feijó³

2001

Sexual Plant Reproduction

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“…In general, these studies have shown that the progeny produced by large pollen loads have enhanced germination, more vigorous vegetative growth, and/or greater reproductive output than the progeny from smaller pollen loads (e.g. Mulcahy and Mulcahy 1975;Mulcahy et al 1978;Ottaviano et al 1983Ottaviano et al 1988Lee and Hartgerink 1986;Stephenson et al 1986;Winsor et al 1987;Davis et al 1987;Ramstetter and Mulcahy 1988;Bertin 1990; Richardson and Stephenson 1992;Quesada et al 1993Quesada et al 1996aPalmer and Zimmerman 1994;Bjorkman 1995), but see Snow (1990Snow ( , 1991.…”

Section: Introductionmentioning

confidence: 96%

Effects of pollination intensity on the vigor of the sporophytic and gametophytic generation of Cucurbita texana

Jóhannsson

Stephenson

1997

Sexual Plant Reproduction

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We examined the effects of pollen competition (pollen load size) on sporophytic vigor and gametophytic performance in Cucurbita texana, a wild gourd, while controlling for alternative interpretations of the data. Under field conditions we compared the vigor of progeny produced from large and small pollen loads and examined the in vitro performance of the pollen produced by the progeny. We found that the progeny from large pollen loads germinated faster and had a greater reproductive output (male flowers and fruits) than progeny produced from small pollen loads. In addition, we found that the pollen produced on plants derived from large pollen loads grew faster in vitro than the pollen produced on plants derived from small pollen loads. These findings indicate that pollen competition affects the performance of the resulting sporophytic generation and the microgametophytes they produce.& k w d : Key words Cucurbita texana · Pollen · Pollen performance · Pollen competition& b d y :

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“…Over the past 15 years a series of studies have indicated that the number of pollen grains deposited onto a flower's stigma affects the performance of the resulting progeny (Mulcahy and Mulcahy 1975;Mulcahy et al 1978;McKenna and Mulcahy 1983;Ter Avanesian 1978;Stephenson etal. 1986;Winsor etal.…”

Section: Introductionmentioning

confidence: 99%

Effects of genotype on pollen performance in Cucurbita pepo

Quesada

Schlichting

Winsor³

et al. 1991

Sexual Plant Reprod

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This study examines the assumption of the pollen competition hypothesis that genetic differences among microgametophytes lead to differences in pollen performance and result in non-random fertilization. In addition, we examined the assumption that pollen performance is genetically correlated with sporophyte vigor due to an overlap in gene expression between the two stages of the life cycle. The results from a pollen mixture experiment in which two cultivars of common zucchini were used show that the ability to sire seeds is nonrandom with respect to the cultivar of the pollen donor plant. The proportion of the progeny sired by the two cultivars is not independent of the region of the fruit where the seeds are produced. The progeny sired by the yellow cultivar outperformed the progeny sired by the green cultivar in a greenhouse study. In addition, the progeny sired by the yellow cultivar from the stylar region of the fruit germinated faster and had more leaf area than the progeny sired by the same cultivar from the peduncular end of the fruit. Thus, the most vigorous progeny are obtained from the stylar region of the fruit where the ovules are fertilized by the most vigorous microgametophytes.

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The influence of gametophytic competition on sporophytic quality in Dianthus chinensis

Cited by 199 publications

References 5 publications

Sexual reproduction in the cork oak ( Quercus suber L). II. Crossing intra- and interspecific barriers

Sexual reproduction in the cork oak ( Quercus suber L). II. Crossing intra- and interspecific barriers

Effects of pollination intensity on the vigor of the sporophytic and gametophytic generation of Cucurbita texana

Effects of genotype on pollen performance in Cucurbita pepo

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