Breeding systems in the grasses: a survey

Connor, H. E.

doi:10.1080/0028825x.1979.10432571

Cited by 117 publications

(99 citation statements)

References 165 publications

(106 reference statements)

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“…As recently as 1979, examples of apomixis in the tropics came principally from weeds or from well-documented case-studies in Andropogoneae and Paniceae (Connor 1979). As late as 1992, comprehensive treatments on apomixis (Mogie 1992;Asker & Jerling 1992) showed virtually nothing on arboreal apomixis in the tropics.…”

Section: Resultsmentioning

confidence: 99%

Polyembryony in angiospermous trees of the Brazilian Cerrado and Caatinga vegetation

Salomão

Allem

2001

Acta Bot. Bras.

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-The occurrence of polyembryony was investigated in 75 woody species of the Cerrado in central Brazil and the xerophilous Caatinga vegetation in northeastern Brazil. Fourteen species showed polyembryony, a type of anomalous angiospermous reproduction. Polyembryony is reported for the first time for nine genera, Astronium, Byrsonima, Cariniana, Copaifera, Hancornia, Magonia, Myracrodruon, Tabebuia, and Tapirira. The positive correlation found between polyembryony, sexual reproduction, and apomictic processes suggests that a number of angiospermous species may make regular use of multiple breeding systems.Keywords -angiosperms, agamospermy, apomixis, polyembryony, Brazilian neotropics RESUMO -A ocorrência de poliembrionia foi investigada em 75 espécies lenhosas do Cerrado do Brasil central e da Caatinga xerófila do nordeste brasileiro. Quatorze espécies apresentaram poliembrionia, uma modalidade de reprodução anômala em angiospermas. Poliembrionia é relatada pela primeira vez para nove gêneros, Astronium, Byrsonima, Cariniana, Copaifera, Hancornia, Magonia, Myracrodruon, Tabebuia e Tapirira. A correlação positiva encontrada entre poliembrionia, reprodução sexual e processos apomíticos sugere que parte das espécies de angiospermas faça uso regular de sistemas de cruzamento múltiplos.Palavras-chave -angiospermas, agamospermia, apomixia, poliembrionia, neotrópico brasileiro Recebido em 29/09/00. Aceito em 25/07/01.

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Section: Resultsmentioning

confidence: 99%

Polyembryony in angiospermous trees of the Brazilian Cerrado and Caatinga vegetation

Salomão

Allem

2001

Acta Bot. Bras.

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“…Although apomixis occurs widely in Poaceae (Connor 1979), it has not been found in Bromus (Connor 1981). The total suppression of fruit set when pollination was excluded suggests that facultative apomixis is improbable in this species.…”

Section: Fruit Set Of Bromus Auleticusmentioning

confidence: 95%

“…The reproductive profile shown by this species (chasmogamous hermaphroditism coupled with allogamy, probable self-incompatibility, and low fruit set) is shared by several grass species (Smith 1944;Connor 1979), including three species of Bromus: B. inermis Leyss. (Wilsie et al 1952;McKone 1985), and B. hordeaceus L. and B. sterilis L. (Connor 1987).…”

Section: Fruit Set Of Bromus Auleticusmentioning

confidence: 99%

Limiting factors of reproductive success inBromus auleticus(Poaceae). 2. Fruit set under different pollination regimes, pollen viability, and incompatibility reactions

Gutiérrez¹,

Medán²,

Pensiero

2006

New Zealand Journal of Botany

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Several aspects related to the reproductive biology of the valuable Argentinian native forage grass Bromus auleticus were studied in three populations to identify its reproductive system and the factors that limit its reproductive success. In vitro pollen fertility and germinability were measured, and the behaviour of pollen tubes under self-pollination was compared with that of cross-pollen. Fruit set under different pollination conditions was also determined. Pollen amount and pollen fertility do not per se limit fruit set, and pollen fertility was not impaired by bagging; however, in vitro pollen germination was low (22.5%) which may limit reproduction. The differential behaviour of pollen tubes under selfing and crossing, as well as the high pollen:ovule ratio, indicate allogamy. Substantial fruit set (38.3%) occurred only when stigmas received nonself pollen in adequate amounts. Treatments providing only self- or no pollination drastically reduced or suppressed fruit set, which suggests lack of apomixis and, at the same time, the operation of a self-incompatibility mechanism. The limited reproductive success of a natural population of this species may be the consequence of self-incompatibility coupled with reduced genetic variation for incompatibility alleles.

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“…Cross pollination represents a complex incompatibility system, insuring outbreeding; self-pollination promotes self-fertility (Connor 1980). Pereira (1982) carried out breeding experiments on some of the Sorghastrum species inhabiting the Brazilian state of Rio Grande Do Sul, i.e., S. minarum.…”

Section: Reproductive Biologymentioning

confidence: 99%

Systematic revision of the genus Sorghastrum (Poaceae: Andropogoneae)

Dávila¹

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Breeding systems in the grasses: a survey

Cited by 117 publications

References 165 publications

Polyembryony in angiospermous trees of the Brazilian Cerrado and Caatinga vegetation

Polyembryony in angiospermous trees of the Brazilian Cerrado and Caatinga vegetation

Limiting factors of reproductive success inBromus auleticus(Poaceae). 2. Fruit set under different pollination regimes, pollen viability, and incompatibility reactions

Systematic revision of the genus Sorghastrum (Poaceae: Andropogoneae)

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