Polyembryony increases embryo and seedling mortality but also enhances seed individual survival in Handroanthus species (Bignoniaceae)

Mendes‐Rodrigues, Clesnan; Sampaio, Diana Salles; Costa, Maria Eugênia da; Caetano, Ana Paula de Souza; Ranal, Marli A.; Júnior, Nelson Sabino Bittencourt; Oliveira, Paulo Eugênio

doi:10.1016/j.flora.2011.10.008

Cited by 26 publications

(37 citation statements)

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“…If the studied plants were sporophytic apomicts, high proportions of polyembryonic seeds (> 20%) were expected. However, a low proportion of polyembryonic seeds (< 5%) can be attributed to some exceptions in the sexual process or to other types of apomixis (Mendes-Rodrigues et al 2012, Firetti-Leggieri et al 2013Sampaio et al 2013b). One investigation of the proportion of polyembryonic seeds in a population of Handroanthus serratifolius showed little variation among individuals (Mendes-Rodrigues et al 2012).…”

Section: Embryo Number and Chromosome Numbermentioning

confidence: 99%

“…Studies of the breeding systems of the neopolyploid species of Anemopaegma and Handroanthus have shown self-fertility and polyembryony (Bittencourt & Semir 2005;Bittencourt & Moraes 2010;Mendes-Rodrigues et al 2012;Firetti-Leggieri et al 2013;Sampaio et al 2013a). Histological analyses have shown that the supernumerary embryos found in polyembryonic seeds arise from somatic tissues of the ovule in Handroanthus ochraceus (Cham.)…”

Section: Introductionmentioning

confidence: 99%

“…(Sampaio et al 2013b), indicating the occurrence of sporophytic apomixis. On the basis of those findings, high frequencies of polyembryonic seeds have been used as evidence of sporophytic apomixis in Bignoniaceae (Mendes-Rodrigues et al 2012, Firetti-Leggieri et al 2013Sampaio et al 2013b). …”

Section: Introductionmentioning

confidence: 99%

“…In addition to its ornamental value (Lorenzi 1992), the species is important for the timber industry, as well as for the pharmaceutical industry, which uses it for a variety of purposes (Gentry 1992a, Lorenzi 1992, including cancer-related research (Oliveira et al 2002;Salustiano et al 2010). This species is reportedly hexaploid, with 2n=120 chromosomes, presenting monoembryonic populations (Sampaio 2010) and populations with high percentages of polyembryonic seeds (Mendes-Rodrigues et al 2012). This makes H. serratifolius an excellent model for the study of the effects that neopolyploidy and apomixis have on the LSI system of Bignoniaceae.…”

Section: Introductionmentioning

confidence: 99%

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Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

et al. 2013

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Polyploidization is common among angiosperms and might induce typically allogamous plants to become autogamous (self-compatible, relying on sexual self-fertilization) or apomictic (achieving asexual reproduction through seeds). This work aimed to determine whether neopolyploidy leads to the breakdown of the self-incompatibility system in the hexaploid non-apomictic species Handroanthus serratifolius (Vahl) S. Grose, through analyses of its floral biology, pollination biology and breeding system. Although anthesis lasted for three days, increasing the overall floral display, receptivity decreased as of the second day. Centridini and Euglossini bees were the main pollinators, and low nectar availability (1.95 ± 1.91 μl/flower) might have obliged them to visit multiple flowers. We observed low reproductive efficacy. That might be explained by self-sterility and by the great number of flowers per individual, which could increase the frequency of geitonogamy. Ovule penetration by the pollen tubes in self-pollinated pistils with posterior abscission indicated late-acting self-incompatibility in H. serratifolius, as observed in other diploid Bignoniaceae species, although inbreeding depression cannot be excluded. The self-sterility found in the monoembryonic, hexaploid individuals studied here contrasts with the results for other neopolyploid Handroanthus and Anemopaegma species, which are often autogamous and apomictic. Our results suggest that neopolyploidy is not the main factor leading to self-fertility in Handroanthus.Key words: apomixis, late-acting self-incompatibility, monoembryony, polyploidy, Tabebuia serratifolia Acta Botanica Brasilica 27(4): 714-722. 2013. Self-sterility in the hexaploid Handroanthus serratifolius(Bignoniaceae), the national flower of Brazil

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Section: Embryo Number and Chromosome Numbermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

et al. 2013

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“…Polyembryony has been shown to further increase the propagule pressure of a species in novel environments [18]. Such embryos arise from either apomictic (asexual) or amphimictic (sexual) processes [19]. The occurrence of polyembryony is ascertained through emergence of multiple seedlings from a single seed during germination [20].…”

Section: Introductionmentioning

confidence: 99%

Germination Biology and Occurrence of Polyembryony in Two Forms of Cats Claw Creeper Vine, <i>Dolichandra unguis-cati</i> (Bignoniaceae): Implications for Its Invasiveness and Management

Buru¹,

Dhileepan²,

Osunkoya³

et al. 2016

AJPS

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Cat's claw creeper vine, Dolichandra unguis-cati (L.) Lohmann (syn. Macfadyena unguis-cati (L.) Gentry), is a major environmental weed in Australia. Two forms ("long" and "short" pod) of the weed occur in Australia. This investigation aimed to evaluate and compare germination behavior and occurrence of polyembryony (production of multiple seedlings from a single seed) in the two forms of the weed. Seeds were germinated in growth chambers set to 10/20˚C, 15/25˚C, 20/30˚C, 30/45˚C and 25˚C, representing ambient temperature conditions of the region. Germination and polyembryony were monitored over a period of 12 weeks. For all the treatments in this study, seeds from the short pod form exhibited significantly higher germination rates and higher occurrence of polyembryony than those from the long pod form. Seeds from the long pod form did not germinate at the lowest temperature of 10/20˚C; in contrast, those of the short pod form germinated under this condition, albeit at a lower rate. Results from this study could explain why the short pod form of D. unguis-cati is the more widely distributed form in Australia, while the long pod form is confined to a few localities. The results have implication in predicting future ranges of both forms of the invasive D. unguis-cati, as well as inform management decisions for control of the weed.

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Apomixis in Melastomataceae

Caetano

Oliveira

2022

Systematics, Evolution, and Ecology of Melastomataceae

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Polyembryony increases embryo and seedling mortality but also enhances seed individual survival in Handroanthus species (Bignoniaceae)

Cited by 26 publications

References 36 publications

Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

Germination Biology and Occurrence of Polyembryony in Two Forms of Cats Claw Creeper Vine, <i>Dolichandra unguis-cati</i> (Bignoniaceae): Implications for Its Invasiveness and Management

Apomixis in Melastomataceae

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Polyembryony increases embryo and seedling mortality but also enhances seed individual survival in Handroanthus species (Bignoniaceae)

Cited by 26 publications

References 36 publications

Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil

Germination Biology and Occurrence of Polyembryony in Two Forms of Cats Claw Creeper Vine, &lt;i&gt;Dolichandra unguis-cati&lt;/i&gt; (Bignoniaceae): Implications for Its Invasiveness and Management

Apomixis in Melastomataceae

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Germination Biology and Occurrence of Polyembryony in Two Forms of Cats Claw Creeper Vine, <i>Dolichandra unguis-cati</i> (Bignoniaceae): Implications for Its Invasiveness and Management