Effects of Geitonogamy on the Seed Set of <i>Magnolia </i><i>obovata</i> Thunb. (Magnoliaceae)

Ishida, Kiyoshi; Yoshimaru, Hiroshi; Itô, Hiroki

doi:10.1086/376812

Cited by 25 publications

(52 citation statements)

References 30 publications

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Section: Levels Of Genetic Variation Within and Among Populationsmentioning

confidence: 55%

“…The fruit set, follicle set and seed set from natural pollination are significantly lower than those from either self-or cross-pollination manipulations (X. M. Zhang, unpublished data) (note that, in the present study, we refer to a ripe carpel and an aggregate of ripe carpels as a follicle and a fruit, respectively, as described by Ishida et al 2003). Apparently, pollen shortage is the reason for this (Ishida et al 2003). Moreover, the seed set and ovule survival rate from hand self-pollination were significantly lower than those from hand cross-pollination, while there was no significant difference in seed weight between the two (X. M. Zhang, unpublished data).…”

Section: Levels Of Genetic Variation Within and Among Populationsmentioning

confidence: 73%

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Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

et al. 2009

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Nine natural populations of the rare evergreen tree Magnolia cathcartii (Magnoliaceae) were sampled across its natural range, and amplified fragment length polymorphism (AFLP) markers were used to assess genetic variation within and among populations. Three ex situ populations were also surveyed to determine whether conservation plantings include the entire genetic diversity of the species. Genetic diversity within the natural populations was very low (0.122 for Nei's gene diversity), and the southeast populations had the highest diversity. The ex situ populations had a lower diversity than the mean diversity for all populations, and none of the ex situ populations reached the levels of diversity found in their source populations. Genetic differentiation was high among natural populations (G st = 0.247), and an isolation-by-distance pattern was detected. Habitat fragmentation, restricted gene flow, and geitonogamy are proposed to be the primary reasons for the low genetic diversity and high genetic differentiation. More protection is needed, especially for the southeast populations, which possess the highest numbers of unique alleles according to AFLP fragment analyses. The ex situ program was a good first step towards preserving this species, but the current ex situ populations preserve only a limited portion of its genetic diversity. Future ex situ efforts should focus on enhancing the plantings with individuals from southeastern Yunnan.

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Section: Levels Of Genetic Variation Within and Among Populationsmentioning

confidence: 55%

Section: Levels Of Genetic Variation Within and Among Populationsmentioning

confidence: 73%

Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

et al. 2009

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“…Many studies have demonstrated that levels of inbreeding depression vary across life history stages; some plants exhibit the highest inbreeding depression values during seed production (Husband and Schemske, 1995;Kittelson and Maron, 2000;Ishida et al, 2003), while the inbreeding depression is more strongly expressed in other plants at later life history stages (Husband and Schemske, 1996). Plants that are primarily selfers express the majority of their inbreeding depression late in the life cycle, during growth and reproduction, whereas outcrossers express much of their inbreeding depression either early, at seed production, or late (Husband and Schemske, 1996).…”

Section: Discussionmentioning

confidence: 99%

Evidence for inbreeding depression in the tree Robinia pseudoacacia L. (Fabaceae)

Yuan

Li²,

Wang³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. The magnitude of inbreeding depression within populations is important for the evolution and maintenance of mixed mating systems. However, data are sparse on the magnitude of inbreeding depression in Robinia pseudoacacia. In this study, we compared differences in the mature seed set per fruit, seed mass, germination success, and seedling growth between self-and crosspollination treatments and estimated the inbreeding depression at 3 stages: seed maturation, seedling emergence, and seedling growth at 10 and 20 weeks. We found that progenies resulting from cross-pollination treatments showed significantly higher fitness than progenies resulting from self-pollination, causing high levels of inbreeding depression. Inbreeding depression was not uniformly manifested, however, over the 3 stages. Inbreeding depression was the greatest between fertilization Inbreeding depression may promote outcrossing in R. pseudoacacia by acting as a post-pollination barrier to selfing. The large difference in the seed set between self-and cross-pollination that we detected indicated that inbreeding depression would probably be a reasonable explanation for the high abortion and low seed set in R. pseudoacacia.

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“…The opportunity for successful pollination is restricted because of a shortage of pollinators (Kikuzawa and Mizui 1990) and pollen (Ishida et al 2003). Isagi et al (2004) conducted a genetic analysis of germinated seedlings of M. obovata and determined that the composition of pollen donors and the rates of self-pollination differed among fruits.…”

Section: Discussionmentioning

confidence: 99%

“…The next day, the petals open again, the stamens release, and pollen is available. Although the flowering period of each flower is 3-4 days, flowering persists on individual trees for up to 40 days (Kikuzawa and Mizui 1990;Ishida et al 2003). Geitonogamy (the transfer of pollen between flowers on the same plant) occurs frequently because of the simultaneous presence of female-and male-phase flowers on an individual tree (Ishida et al 2003).…”

Section: Study Speciesmentioning

confidence: 99%

Pollination Efficiencies of Insects Visiting Magnolia obovata, as Determined by Single-Pollen Genotyping

Matsuki¹,

Tomita

Isagi

2011

Ecological Research Monographs

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Effects of Geitonogamy on the Seed Set of Magnolia obovata Thunb. (Magnoliaceae)

Cited by 25 publications

References 30 publications

Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

Evidence for inbreeding depression in the tree Robinia pseudoacacia L. (Fabaceae)

Pollination Efficiencies of Insects Visiting Magnolia obovata, as Determined by Single-Pollen Genotyping

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