Effects of Competition on the Growth of Lotus corniculatus L. Seedlings Produced by Random and Natural Patterns of Fruit Abortion

Stephenson, Andrew G.; Johnson, Ross S.; Winsor, James A.

doi:10.2307/2425890

Cited by 12 publications

(9 citation statements)

References 22 publications

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“…The smallest pollen load, 25.7 grains per stigma, was also smaller than we had achieved in a previous study (Marshall et al, 2000). This pattern of fruit abortion suggests that abortion was selective based on seed quality or quantity per fruit (Stephenson and Winsor, 1986;Winsor et al, 1987;Stephenson et al, 1988). 2, Table 3).…”

Section: Discussionsupporting

confidence: 58%

“…When pollen is abundant, offspring fitness is often increased; when pollen is limited, offspring fitness may decrease Winsor et al, 1987;Stephenson et al, 1988;Bjorkman, 1995;Johannsson and Stephenson, 1997;Niesenbaum, 1999). When pollen is abundant, offspring fitness is often increased; when pollen is limited, offspring fitness may decrease Winsor et al, 1987;Stephenson et al, 1988;Bjorkman, 1995;Johannsson and Stephenson, 1997;Niesenbaum, 1999).…”

Section: Discussionmentioning

confidence: 99%

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Under how wide a set of conditions will nonrandom mating occur in Raphanus sativus (Brassicaceae)?

Shaner

Marshall

2003

American J of Botany

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Studies of the weedy annual Raphanus sativus have demonstrated that nonrandom mating, a prerequisite for sexual selection, can occur in greenhouse plants. To determine whether this nonrandom mating pattern can occur under a wide range of conditions, including conditions that might occur in the field, we considered variation in both maternal condition and pollen load size. Maternal condition was varied by altering the watering regime. Pollen load size was varied from approximately 26 to 343 pollen grains per stigma. At the smallest pollen load size, patterns of seed paternity were altered in two of the three pollen donor pairs; seed paternity became more equal among donors. For one of three pollen donor pairs, seed paternity was more divergent among donors on stressed maternal plants. Finally, for one pollen donor pair, rank order of pollen donor performance changed from the medium to the small pollen loads on stressed vs. control maternal plants. Thus, some field conditions may alter patterns of nonrandom mating in wild radish.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Under how wide a set of conditions will nonrandom mating occur in Raphanus sativus (Brassicaceae)?

Shaner

Marshall

2003

American J of Botany

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“…For example, target donor number 6 sired 12% of the seeds when its pollen was mixed with standard competitors, while target donor number 2 sired 39% of the seeds in similar crosses. These kinds of differences in seed siring ability are consistent with previous studies of wild radish (Marshall and Ellstrand, 1986;Marshall, 1991Marshall, , 1998 and Cucurbita pepo (Stephenson et al, 1988;Richardson and Stephenson, 1992).…”

Section: Discussionsupporting

confidence: 92%

“…Perhaps the small pollen load sizes produced fewer and/or poorer quality of fertilized seeds, leading to selective abortion of fruits. While fertilization and abortion were not measured in this study, this interpretation is consistent with previous studies of wild radish (Marshall et al, 2000;Shaner and Marshall, 2003), Lotus corniculatus (Stephenson and Winsor, 1986;Stephenson et al, 1988), Thalictrum pubescence (Davis, 2004), and Mirabilis jalapa (Niesenbaum, 1999). Second, the number of good seeds per fruit was reduced in the low pollen load size, suggesting that not all ovules were fertilized or embryos of poor quality were aborted in the smaller pollen load sizes (Tables 1 and 2).…”

Section: Discussionsupporting

confidence: 91%

How robust is nonrandom mating in wild radish: do small pollen loads coupled with more competing pollen donors lead to random mating?

Shaner

Marshall

2007

American J of Botany

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In previous studies of the weedy annual Raphanus sativus we have demonstrated that mating is nonrandom in greenhouse plants, suggesting that sexual selection is possible. To investigate how these greenhouse results might translate to conditions more similar to the field, we manipulated both pollen load size and the number of competing pollen donors on stigmas. While the smallest pollen loads (22 grains per stigma) were small enough to reduce fruit and seed set, seed siring success was unaffected by pollen load size. When the number of competing donors in a mixed pollination was increased to four, the proportion of seeds sired by the pollen donors was the furthest from expectation, suggesting that nonrandom mating increases as the number of donors per pollination increases. There was no significant interaction between pollen load size and number of competitors per pollination. Overall, mating remained nonrandom across all treatments. Thus differential seed paternity is likely to occur in the field as well as in the greenhouse.

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“…The main findings of this study parallel those reported for Lotus corniculatus (Stephenson and Winsor 1986;Stephenson et al 1988). Self-thinned inflorescences of L. corniculatus produced seeds with higher germination success, as well as more vigorous seedlings, than hand-thinned inflorescences.…”

Section: Discussionsupporting

confidence: 88%

Selective Fruit Maturation and Seedling Performance in Acacia caven (Fabaceae)

Torres¹,

Eynard

Aizen

et al. 2002

International Journal of Plant Sciences

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The tight globose inflorescences of Acacia caven commonly initiate several fruits, but only one or a few reach maturity. In this study, we ask whether natural fruit maturation patterns in this species are related to either fruit, seed, or seedling performance. We compared fruit, seed, and seedling characteristics from inflorescences that initiated several fruits but self-thinned naturally to mature one fruit, with inflorescences in which we chose randomly one immature fruit and removed all the others at an early stage of development. Also, we considered two additional natural treatments: inflorescences that initiated and matured two or more pods and inflorescences that naturally initiated and matured one fruit only. Around half of the fruits aborted in both manipulated inflorescences and inflorescences that initiated one fruit only. Pod size, seed number, and individual seed mass did not differ significantly between hand-and self-thinned inflorescences. Seeds from hand-thinned inflorescences showed, however, a significant decline in germination rate. Seeds from the other two additional natural treatments showed intermediate germination percentages. In addition, seedlings derived from germinated seeds produced by artificially thinned inflorescences also tended to perform poorly based on six quantitative seedling traits and seedling survival. The results indicate that progeny from hand-thinned inflorescences are of lower quality than progeny from inflorescences that underwent natural fruit abortion, supporting the hypothesis that A. caven matures selectively those fruits that contain more vigorous seeds.

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Effects of Competition on the Growth of Lotus corniculatus L. Seedlings Produced by Random and Natural Patterns of Fruit Abortion

Cited by 12 publications

References 22 publications

Under how wide a set of conditions will nonrandom mating occur in Raphanus sativus (Brassicaceae)?

Under how wide a set of conditions will nonrandom mating occur in Raphanus sativus (Brassicaceae)?

How robust is nonrandom mating in wild radish: do small pollen loads coupled with more competing pollen donors lead to random mating?

Selective Fruit Maturation and Seedling Performance in Acacia caven (Fabaceae)

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