Plant Interspecific Hybridization: Outcomes and Issues at the Intersection of Species

Morgan, E.R.; Timmerman-Vaughan, Gail M.; Conner, A. J.; Griffin, W. B.; Pickering, R. A.

doi:10.1002/9780470880579.ch5

Cited by 14 publications

(6 citation statements)

References 240 publications

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“…However, unpollinated flowers left as controls on the same maternal plants did not set any seeds. Another possible explanation for mother-like plants is the production of seeds via apomixis [ 6 , 44 ].…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of reproductive barriers contributes to the development of novel interspecific hybrids in the Kalanchoë genus

Kuligowska

Lütken

Christensen³

et al. 2015

BMC Plant Biol

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BackgroundInterspecific hybridization is a useful tool in ornamental breeding to increase genetic variability and introduce new valuable traits into existing cultivars. The successful formation of interspecific hybrids is frequently limited by the presence of pre- and post-fertilization barriers. In the present study, we investigated the nature of hybridization barriers occurring in crosses between Kalanchoë species and evaluated possibilities of obtaining interspecific hybrids.ResultsThe qualitative and quantitative analyses of pollen tube growth in situ were performed following intra- and interspecific pollinations. They revealed occurrence of pre-fertilization barriers associated with inhibition of pollen germination on the stigma and abnormal growth of pollen tubes. Unilateral incongruity related to differences in pistil length was also observed. The pollen quality was identified as a strong factor influencing the number of pollen tubes germinating in the stigma. In relation to post-fertilization barriers, endosperm degeneration was a probable barrier hampering production of interspecific hybrids. Moreover, our results demonstrate the relation of genetic distance estimated by AFLP marker analysis of hybridization partners with cross-compatibility of Kalanchoë species. At the same time, differences in ploidy did not influence the success of interspecific crosses.ConclusionsOur study presents the first comprehensive analysis of hybridization barriers occurring within Kalanchoë genus. Reproductive barriers were detected on both, pre- and post-fertilization levels. This new knowledge will contribute to further understanding of reproductive isolation of Kalanchoë species and facilitate breeding of new cultivars. For the first time, interspecific hybrids between K. nyikae as maternal plant and K. blossfeldiana as well as K. blossfeldiana and K. marnieriana were generated.Electronic supplementary materialThe online version of this article (doi:10.1186/s12870-014-0394-0) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

“…Crosses among plants belonging to different species are naturally occurring phenomena when distributions of species overlap [ 6 ]. There are, however, processes that ensure reproductive isolation of distinct species.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of reproductive barriers contributes to the development of novel interspecific hybrids in the Kalanchoë genus

Kuligowska

Lütken

Christensen³

et al. 2015

BMC Plant Biol

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“…Allopolyploidization is widespread in nature and has been an important force in plant evolution and speciation (Soltis and Soltis 2009). Many economically important species are allopolyploids, including wheat, rapeseed, cotton, and banana (Morgan et al 2011). Besides these ancient allopolyploids, which have originated thousands of years ago, recent and ongoing natural interspecific hybridization and allopolyploidization events are known, including Tragopogon and Senecio (Hegarty and Hiscock 2009).…”

Section: Interspecific Hybridizationmentioning

confidence: 99%

Cytogenetic insights into Festulolium

Majka¹,

Majka²,

Kopecký³

et al. 2020

Biol. plant.

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Climate change calls for new methods and plant materials to breed crops adapted to new environmental conditions. Sustainable forage and amenity grass production during periods of severe drought and heat waves during summer, and unequal distribution of precipitation over the year will require drought-tolerant genotypes. However, high-yielding ryegrasses (Lolium spp.), which are the most commonly used grass species, suffer during abiotic stresses. Introgression of drought and heat tolerance from closely related fescues (Festuca spp.) offers an opportunity to develop superior hybrid cultivars to mitigate the negative impact of climate change. Intergeneric cross-hybridization and the development of Festulolium (Festuca × Lolium) hybrids was initiated 100 years ago and resulted in registration of almost one hundred cultivars. For a long time, their genome composition was not known and was debated by breeders and geneticists. In the last three decades, molecular cytogenetic and genomic approaches have enabled their detailed characterization. These studies revealed a gradual replacement of Festuca chromosomes by those of Lolium in consecutive generations leading to an almost complete elimination of Festuca chromatin in the introgression forms. On the other hand, amphiploid cultivars seem to be more stable with the optimal proportions of the Lolium to Festuca genomes at about 2:1. In this mini review, we discuss recent advances in the analysis of the genome composition of Festulolium hybrids with a specific focus on genome (in)stability.

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“…An example of the first approach is shown by the release of a cultivar of P. plurinerve with introgressed germplasm from P. urvillei (Schrauf & Blanco, 2003), but the second strategy has not been explored systematically. Hybridization may have both desirable and undesirable consequences for breeding, including sterility and hybrid weakness, but it may also trigger the expression of novel valuable characters by transgressive segregation, both from the point of view of breeding (Morgan et al, 2011) and evolution (Rieseberg & Willis, 2007). Some analyses suggest that the extent to which transgressive segregation may be expected in interspecific hybrids may increase with the genetic distance between the parental species to a certain degree of divergence (Stelkens & Seehausen, 2009).…”

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confidence: 99%

Could the Dilatata group of Paspalum be bred as sexual species? A preliminary assessment

Monteverde

Olveyra

Speranza

2021

Grass and Forage Science

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Apomixis provides a method for cloning plants through seed and it has been viewed as a promising mechanism to enable the exploitation of hybrid vigour and hybrid genotype propagation in seed propagated crops (Hanna & Bashaw, 1987), both for selfing and outcrossing species (Savidan, 2010). For this reason, apomictic reproduction was seen as potentially leading to large increases in agricultural production (Vielle Calzada et al., 1996). In spite of that, in crops that naturally reproduce by apomixis, breeding schemes that are specifically addressed to exploit heterosis have only relatively recently been explicitly proposed, based on those applied to sexual crops like maize (Miles, 2007). The absence of sexual germplasm, particularly at the same ploidy level of the apomictic crop, was in many cases the main cause of this delay. Sexual populations which provide a source of female parents have been synthesized in many cases from artificially obtained polyploid sexual individuals, which allowed to release a wealth of genetic variability from the naturally occurring apomictic germplasm (Miles, 2007;Zilli et al., 2018). The genetic nature of this variability is still being analysed, but at least in some cases, the additive genetic contribution of the sexual plants themselves may be one of the major components (Figueiredo et al., 2019). These strategies show great promise for the onset of continuous breeding programmes for apomictic crops. However, they

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Plant Interspecific Hybridization: Outcomes and Issues at the Intersection of Species

Cited by 14 publications

References 240 publications

Evaluation of reproductive barriers contributes to the development of novel interspecific hybrids in the Kalanchoë genus

Evaluation of reproductive barriers contributes to the development of novel interspecific hybrids in the Kalanchoë genus

Cytogenetic insights into Festulolium

Could the Dilatata group of Paspalum be bred as sexual species? A preliminary assessment

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