Untersuchungen über das Pollenschlauchwachstum bei verschiedenenTrifolium-Artkreuzungen

Múller, G. L.

doi:10.1007/bf00711142

Cited by 8 publications

(2 citation statements)

References 9 publications

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“…Successful crosses in species with the same EBN may be prevented by pre‐ or/and postfertilization barriers unrelated to EBN. Such barriers include failure of pollen tubes to grow after interspecific crosses (Müller 1960, Evans 1962 and Kazimierska 1978). Interspecific stylar barriers must always be considered and when they serve as the initial block to hybridization, the reciprocal cross may result in successful hybridization as possibly happened in the present example.…”

Section: Discussionmentioning

confidence: 99%

The use of endosperm balance number for predicting gamete selection in complex polyploid interspecific Trifolium repens × T. nigrescens crosses

Hussain

Williams

2008

Plant Breeding

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Endosperm balance number (EBN) was used to predict the outcome of crosses among a series of complex polyploid interspecific hybrids between Trifolium repens and T. nigrescens. Normal endosperm development, and hence seed-set, requires a 2 : 1 maternal : paternal EBN ratio in endosperm. Based on their crossability, T. repens (2n = 4x = 32) and T. nigrescens (2n = 2x = 16) were assigned the same EBN of 4. This number was used to predict the relative success of different backcrosses and intercrosses. The method was further developed to successfully predict which gametes would effect fertilization when complex polyploid hybrids with uneven genomic constitutions (5x, 7x) produced mixtures of euploid and aneuploid gametes. This was achieved by allocating EBNs to all potential gametes of complex polyploids. Allocation of gamete EBNs enabled not only prediction of the success or failure of a cross, but also which gametes would be filtered to effect fertilization in complex crosses. This enhanced ability to understand the potential outcomes of complex crosses will increase the efficiency of plant breeding programmes that integrate secondary gene-pools into economic species by interspecific hybridization.

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Section: Discussionmentioning

confidence: 99%

The use of endosperm balance number for predicting gamete selection in complex polyploid interspecific Trifolium repens × T. nigrescens crosses

Hussain

Williams

2008

Plant Breeding

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“…Such barriers are well known in Trifolium. The failure of pollen tubes to grow after interspecific crosses has been well documented by Muller (1960), Evans (1962 b) , and Kazimierska (1978 a). In addition, crosses between species differing in EBN can be successful, albeit at a very low rate.…”

Section: 'Rare Hybrid (3 Hybrids From 1750 Crosses) D~l B I N O Seedmentioning

confidence: 94%

Evidence for the existence of endosperm balance number in the true clovers (Trifolium spp.)

Parrott¹,

Smith²

1986

Can. J. Genet. Cytol.

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PARROTT, W. A., and R. R. SMITH. 1986. Evidence for the existence of endosperm balance number in the true clovers (Trifolium spp.) Can. J. Genet. Cytol. 28: 581-586. The endosperm balance number (EBN) hypothesis was first advanced to explain results from interspecific crosses in Solanum and later in Impatiens. According to the EBN hypothesis, normal endosperm development following intra-or inter-specific crosses depends on having a ratio of two EBNs from the female to one EBN from the male in the endosperm tissue. EBNs may differ among related species. Successful hybrids can be obtained between species with the same EBN. The ploidy level of an individual species can be varied to modify its EBN, making it cross compatible with a species sharing its modified EBN. Interspecific crosses within Trijolium have been limited and difficult. Crosses reported in the literature, including evidence from our own study, suggest that EBN is operating in Trifolium and have been used to assign EBN numbers to some clover species. The use of 2n eggs enabled two species, differing in EBN, to be crossed. An understanding of the EBN mechanism that operates in Trifolium should make successful interspecific hybrids easier to obtain in the future.Key words: endosperm balance number, hybrids jinterspecific), 2n gametes, Trifolium.PARROTT, W. A., et R. R. SMITH. 1986. Evidence for the existence of endosperm balance number in the true clovers (Trifolium spp.) Can. J. Genet. Cytol. 28: 581-586. L'hypothkse de la balance numtrique d'un endosperme (BNE) a t t t formulte pour expliquer les rtsultats de croisements interspkcifiques, d'abord chez Solanum et, plus tard, chez Impatiens. D'aprks cette hypothkse, il y a formation d'un endosperme normal lors de croisements intra-ou inter-sptcifiques, si le tissu endospermique comporte un ratio de 2 BNE du parent femelle et de une BNE du parent male. Les BNE peuvent Ctre difftrentes chez les espkces relites. De bons hybrides peuvent Ctre obtenus d'espkces ayant la mCme BNE. Le niveau de ploi'die d'une espkce particulikre peut varier et engendrer une BNE modifiCe et cette espkce pourra etre croisCe avec une autre espkce dont la BNE a t t t modifite de la mCme f a~o n .Les croisements interspkcifiques chez Trijolium ont Ct C limitCs et difficiles. Les croisements rapportts dans la littkrature, incluant les tvidences de a1 prCsente Ctude, suggkrent que la BNE joue un r61e chez Trijolium et des nombres BNE (EBN) ont Ctt assignts a certaines espkces de trkfle. Le recours a des oosphkres 2n a rendu possible le croisement entre deux espkces dont la BNE difftrait. Une bonne connaissance du mCcanisme par lequel la BNE agit chez Trijolium devrait permettre l'obtention plus facile d'hybrides interspkcifiques ulterieurement .Mots clks: balance numCrique de l'endosperme, hybrides interspkcifiques, gamktes 2n, Trifolium.[Traduit par la revue]

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Species hybridization in Trifolium

Evans

1962

Euphytica

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Untersuchungen über das Pollenschlauchwachstum bei verschiedenenTrifolium-Artkreuzungen

Cited by 8 publications

References 9 publications

The use of endosperm balance number for predicting gamete selection in complex polyploid interspecific Trifolium repens × T. nigrescens crosses

The use of endosperm balance number for predicting gamete selection in complex polyploid interspecific Trifolium repens × T. nigrescens crosses

Evidence for the existence of endosperm balance number in the true clovers (Trifolium spp.)

Species hybridization in Trifolium

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