Sistema reprodutivo do Ipê-Branco: Tabebuia roseo-alba (Ridley) Sandwith (Bignoniaceae)

Gandolphi, Gabriel; Bittencourt, Nelson Sabino

doi:10.1590/s0102-33062010000300026

Cited by 20 publications

(53 citation statements)

References 31 publications

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“…The self-pollen tube growth and the ovule penetration observed in self-pollinated pistils, together with the increase in ovary size in self-pollinated pistils that will be aborted, indicate the occurrence of LSI (Gibbs & Bianchi 1993;Bittencourt et al 2003;Bittencourt & Semir 2005;Gandolphi & Bittencourt 2010). However, in the Handroanthus serratifolius individuals evaluated here, the fact that two fruits from hand self-pollinations with unviable seeds persisted up to the maturation of fruits from hand cross-pollinated pistils can be an indicative of inbreeding depression, which can mimic LSI (Seavey & Bawa 1986, Bittencourt et al 2003.…”

Section: Discussionmentioning

confidence: 99%

“…Eighty percent of the studied species present self-sterility, which is often characterized as a result of late-acting self-incompatibility (LSI) mechanisms (Gibbs & Bianchi 1993;Bittencourt et al 2003;Bittencourt & Semir 2005;Gandolphi & Bittencourt 2010). To date, all neopolyploid Bignoniaceae species have been found to be self-compatible (Gobatto-Rodrigues & Stort 1992;Bittencourt & Semir 2005;Bittencourt & Moraes 2010;Firetti-Leggieri et al 2013;Sampaio et al 2013a), although not all self-compatible species are neopolyploids (Dutra & Machado 2001;Yanagizawa & Maimoni-Rodella 2007;Qu et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The LSI found in most species of Bignoniaceae allows pollen tube growth, ovule penetration, fertilization and endosperm development prior to self-pollinated pistil abscission (Bittencourt et al 2003;Bittencourt & Semir 2005;Gandolphi & Bittencourt 2010). In apomictic species, adventitious embryos develop irrespective of pollination but are able to reach maturity only when the endosperm is available (Bittencourt & Moraes 2010;Sampaio et al 2013b).…”

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: Discussionmentioning

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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“…The progress of post-pollination events, from ovule penetration to endosperm initial development, is slower in selfed pistils compared to crossed ones (Bittencourt et al, 2003;Bittencourt and Semir, 2004, 2006. In at least one species [Tabebuia roseoalba (Ridley) Sandwith], even the efficacy of ovule penetration by self pollen tubes is comparable or higher than that of pollen tubes in crossed pistils, and selfed pistils have an extended longevity compared to unpollinated pistils (Gandolphi and Bittencourt, 2010). These features have been interpreted as indications of late-acting self-incompatibility (LSI) [sensu Seavey and Bawa (1986) and Sage et al (1994)] with post-zygotic abortion of self-pollinated pistils in self-sterile species of Bignoniaceae.…”

Section: Introductionmentioning

confidence: 99%

“…A sufficient number of affected ovules/seeds are required to trigger the rejection of the pistil/fruit, so that a continuum of failure throughout fruit development would be expected (Wiens et al, 1987;Sage et al, 1994;Mahy and Jacquemart, 1999). Therefore, the discrimination of LSI and EID in self-sterile angiosperms usually requires the rigorous analysis of post-pollination events in histological sections of selfed pistils collected at several time points after hand pollination (Sage et al, 1999;Bittencourt et al, 2003;Semir, 2005, 2006;Gandolphi and Bittencourt, 2010).…”

Section: Introductionmentioning

confidence: 99%

The reproductive biology of Cybistax antisyphilitica (Bignoniaceae), a characteristic tree of the South American savannah-like “Cerrado” vegetation

Bittencourt

Pereira

São-Thiago

et al. 2011

Flora - Morphology, Distribution, Functional Ecology of Plants

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a b s t r a c tBignoniaceous woody species are very important ecological components of neotropical forests, but the reproductive biology of many species, such as Cybistax antisyphilitica, remains virtually unknown. Most species of Bignoniaceae are characteristically self-sterile, despite typically exhibiting normal pollen tube growth throughout the style, combined with slow rates of ovule penetration, fertilisation and endosperm initiation in selfed pistils. Uniform abortion occurs within a few days of anthesis, indicating the occurrence of late-acting self-incompatibility (LSI). However, breeding system studies have been performed in fewer than 7% of species, and other types of breeding systems (e.g., self-compatibility and apomixis) have been reported in this family. In the present study, the reproductive biology of C. antisyphilitica was investigated by field observation of flower visitors and floral events. Moreover, reproductive biology of this species was examined through experimental pollinations, analyses of pollen tube growth and ovule penetration using fluorescence microscopy, verification of pistil longevity, and a histological analysis of unpollinated vs. self-pollinated pistils. Finally, morphological aspects, quantities and germination were investigated in seeds that resulted from different pollination treatments. Natural pollination was effected by largeand medium-sized bees, and their visiting behaviour favours a high proportion of geitonogamy and no pollen limitation. Self-pollinated flowers produced no fruits, and all of the characteristic post-pollination events cited above were verified, witnessing the occurrence of LSI with post-zygotic rejection of selfed pistils in C. antisyphilitica. Although some indications of extended pistil longevity were found in selfed pistils, this feature seemed to be affected by unidentified environmental factors. The seeds were always monoembryonic and with high viability. A larger variation in the number of viable seeds was found in fruits derived from natural pollination. A low fruit set was observed after both natural and crosspollination, and most crossed fruits underwent abortion at several points during the juvenile phase, even when protected against herbivory. The formation of surplus flowers/juvenile fruits and the apparently wasteful selfing mechanism control implied in LSI are discussed in the context of the perennial life style of tropical woody plant species.

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Polyploidy and polyembryony in Anemopaegma (Bignonieae, Bignoniaceae)

et al. 2013

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Polyploidy is a key process in plant evolution, with the asexual formation of embryos representing a way through which polyploids can escape sterility. The association between polyploidy and polyembryony is known to occur in Bignoniaceae. In this study, we investigate polyembryony in four polyploid species of Anemopaegma: A. acutifolium, A. arvense, A. glaucum and A. scabriusculum as well as in one diploid species, A. album. Polyembryony was observed only in polyploid species. We used seed dissection and germination tests to compare the number of polyembryonic seeds. We tested how the pollen source influences the number of polyembryonic seeds and the number of embryos per seed and tested the correlation between the number of viable seeds per fruit and mean number of embryos per seed. The number of polyembryonic seeds observed by seed dissection was higher than the number of polyembryonic seeds determined by the germination test, with the number of embryos produced per seed being higher than the number of seedlings. The dissection of seeds of A. glaucum indicated that a higher number of polyembryonic seeds and a higher number of embryos were present in seeds from cross-pollination than in seeds from self-pollination. On the other hand, germination tests indicated that a higher number of polyembryonic seeds were present in fruits from self-pollination than from cross-pollination. The mean number of embryos per seed was not influenced by the number of viable seeds per fruit in fruits from open pollination. These results indicate a positive relationship between polyembryony and polyploidy in Anemopaegma.

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Sistema reprodutivo do Ipê-Branco: Tabebuia roseo-alba (Ridley) Sandwith (Bignoniaceae)

Cited by 20 publications

References 31 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

The reproductive biology of Cybistax antisyphilitica (Bignoniaceae), a characteristic tree of the South American savannah-like “Cerrado” vegetation

Polyploidy and polyembryony in Anemopaegma (Bignonieae, Bignoniaceae)

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