The Reproductive Biology Of Cybistax Antisyphilitica (bignoniaceae), A Characteristic Tree Of The South American Savannah-like "cerrado" Vegetation

dc.creatorBittencourt N.S.
dc.creatorPereira E.J.
dc.creatorde Souza Sao-Thiago P.
dc.creatorSemir J.
dc.date2011
dc.date2015-06-30T20:39:11Z
dc.date2015-11-26T14:52:49Z
dc.date2015-06-30T20:39:11Z
dc.date2015-11-26T14:52:49Z
dc.date.accessioned2018-03-28T22:04:49Z
dc.date.available2018-03-28T22:04:49Z
dc.identifier
dc.identifierFlora: Morphology, Distribution, Functional Ecology Of Plants. , v. 206, n. 10, p. 872 - 886, 2011.
dc.identifier3672530
dc.identifier10.1016/j.flora.2011.05.004
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-80053450994&partnerID=40&md5=eb02c8f7fdf538b9ca0b6facfce58417
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/108800
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/108800
dc.identifier2-s2.0-80053450994
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1254872
dc.descriptionBignoniaceous 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 large- and 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 cross-pollination, 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. © 2011 Elsevier GmbH.
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dc.languageen
dc.publisher
dc.relationFlora: Morphology, Distribution, Functional Ecology of Plants
dc.rightsfechado
dc.sourceScopus
dc.titleThe Reproductive Biology Of Cybistax Antisyphilitica (bignoniaceae), A Characteristic Tree Of The South American Savannah-like "cerrado" Vegetation
dc.typeArtículos de revistas


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