Effects of Pollen Load Size on Fruit Maturation and Sporophyte Quality in Zucchini

Stephenson, Andrew G.; Winsor, James A.; Davis, L. E.

doi:10.1007/978-1-4613-8622-3_69

Cited by 52 publications

(34 citation statements)

References 8 publications

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“…Fruit maturation in many plant species has been pointed out as a pollinator limitation which reflects the shortage of pollinators or the lack of successful pollination (Schemske 1981, Bertin 1982, Aker 1982, Waser 1983. It has been also regarded as result of sexual selection in which male genetic success is limited by its ability to reach the ovules, while female fitness is limited by the availability of resources for the egg (Janzen 1977, Willson 1979, Stenphenson & Bertin 1983, the ultimate cause of fruit abortion (Janzen 1977, Stephenson 1981, Stephenson et al 1985, Lee 1984. The production of surplus of flowers and the massive abscission as here documented in Tabebuia, suggest that the plants might have some control over their offsprings.…”

Section: Resultsmentioning

confidence: 79%

Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. (Bignoniaceae) in Central Brazil cerrado vegetation

Barros¹

2001

Rev. bras. Bot.

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-(Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. in Central Brazil cerrado vegetation). The pollination ecology and breeding systems of Tabebuia aurea (Manso) Benth. & Hook., and T. ochracea (Cham.) Standl. were investigated in an area of cerrado vegetation in the Federal District of Brazil. These species occur sympatrically, flower massively and synchronously for a month, during the dry season (July to September). Both have diurnal anthesis, with similar floral structures, a yellow tubular corolla and produce nectar. Fourteen species of bees visited both Tabebuia species, but, only three Centris species and Bombus morio, were considered potential pollinators, because of their high frequency on the flowers and their efficiency in carrying pollen. Tests on the breeding systems of T. aurea and T. ochracea demonstrated that boths species are self-incompatible, with late-acting self-incompatibility. The proportion of fruit set from cross pollination (T. aurea 17.2% and T. ochracea 12.3%) in both species was low considering the great number of flowers displayed. This suggests a lack of maternal resources for fruit-set. The great amount of seeds per fruit (about 92 in T. aurea and 285 in T. ochracea) may represent an investment of maternal resources allocated on higher quality of fertilized ovules. RESUMO -(Ecologia da polinização de

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Section: Resultsmentioning

confidence: 79%

Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. (Bignoniaceae) in Central Brazil cerrado vegetation

Barros¹

2001

Rev. bras. Bot.

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“…The mature fruits were harvested and the seeds were extracted, dried and stored for use in the following summer. Previous studies have shown that fruits produced by small pollen loads tend to have fewer but larger seeds than fruits produced by large pollen loads (Stephenson et al 1986;Winsor et al 1987). To control for differences in seed number and seed weight associated with differences in the size of the pollen load (the intensity of pollen competition), styles from the flowers receiving the large pollen loads were excised at the ovary 12-15 h after pollination, thus allowing only the fastest 1%-2% of the pollen tubes to enter the ovary (Quesada et al 1993).…”

Section: Methodsmentioning

confidence: 98%

“…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: 99%

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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“…Nevertheless, if the quality and source of pollen can always limit the reproductive success (Tangmitcharoen and Owens 1997), the effect of pollen Communicated by S. Russell quantity has only been demonstrated in a few species of noncultivated plants including Campsis radicans (Bertin 1990). Such effects have been seen, however, in several cultivated species, including Zea mays (Ottaviano et al 1983) and Cucurbita pepo (Stephenson et al 1986). …”

Section: Introductionmentioning

confidence: 99%

Reproductive biology of Olive (Olea europaea L.) DOP Umbria cultivars

et al. 2006

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Olive trees have a plentiful bloom but a low percentage of normal fruit set. To improve fruit set, numerous investigations have sought to identify the obstacles that prevent full production. In this work, flower development in five DOP Umbria cultivars (Leccino, Frantoio, Moraiolo, Dolce Agogia and San Felice) was studied throughout different developmental phases, from before microsporogenesis and megasporogenesis to post-anthesis, by morphological and cytohistological observations. Dolce Agogia was the most precocious cultivar, while full flowering was simultaneous in Leccino, Frantoio, Moraiolo and San Felice. Frantoio and Leccino were also good pollen producers, having the highest percentage of pollen viability and germinability. Dolce Agogia can also be considered a good pollen producer in terms of the high quantity of released pollen, but it had the lowest levels of pollen viability and germinability and the highest percentage of aborted flowers and ovaries. Morphological and cytohistological observations on the number of flowers per inflorescence and the number of aborted flowers and ovaries suggest that fruit set was not influenced by the number of flowers per inflorescence, but rather by the number of inflorescences, which depends on the global fruiting potential of the tree.

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Effects of Pollen Load Size on Fruit Maturation and Sporophyte Quality in Zucchini

Cited by 52 publications

References 8 publications

Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. (Bignoniaceae) in Central Brazil cerrado vegetation

Pollination ecology of Tabebuia aurea (Manso) Benth. & Hook. and T. ochracea (Cham.) Standl. (Bignoniaceae) in Central Brazil cerrado vegetation

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

Reproductive biology of Olive (Olea europaea L.) DOP Umbria cultivars

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