Adventitious embryony inNigritella (Orchidaceae)

Teppner, Herwig

doi:10.1007/bf02815377

Cited by 19 publications

(20 citation statements)

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“…Thus, we cannot rule out that some of these specimens may be hybrids, presumely triploids, since the putative parents occur in the same location or at least in neighbouring areas. Partial sexuality in apomictic plants of the N. nigra group has been reported by Teppner (1996).…”

Section: Phytodermologic Featuresmentioning

confidence: 98%

“…Nigritella gabasiana is a diploid, sexual, species (Teppner & Klein, 1993;Teppner, 1996), closely related to the diploid endemic species of the Balcans N. rhelli- canii Teppner & Klein (Hedrén & al., 2000). Nigritella rhellicani is readily distinguished from N. gabasiana by its slightly narrowed labellum in its basal third, which is usually smaller (4.5-7 mm long), and its basal bracts, with denticles 0.05-0.1 mm long.…”

Section: Taxonomic Status Of Iberian Nigritellamentioning

confidence: 99%

“…The Nigritella nigra group includes three polyploid taxa that reproduce apomictically by adventitious embryos (Teppner, 1996). Nigritella nigra subsp.…”

Section: Taxonomic Status Of Iberian Nigritellamentioning

confidence: 99%

“…This genus constitutes a polyploid complex with a diversity nucleus in the Alps (Hedrén & al., 2000). Studies by Teppner & Klein over the last two decades have greatly contributed to the knowledge of this genus (Teppner & Klein, 1985a, 1985b, 1990, 1993, 1998Teppner, 1996;Klein & Drescher, 1996;Teppner & Ster, 1996;Hedrén & al., 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Richard (Orchideae, Orchidaceae) includes about a dozen species that are distributed over the mountain areas of central and southern Europe (Alps, Apennines, Carpathians, Balcans, Pyrenaean and Cantabrian mountains) and Scandinavia (Teppner, 1996;Teppner & Klein, 1998;Delforge, 2001). This genus constitutes a polyploid complex with a diversity nucleus in the Alps (Hedrén & al., 2000).…”

Section: Introductionmentioning

confidence: 99%

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Sáez¹

2004

Anal. Jard. Bot. Madr.

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As a result of the revision of Nigritella L.C.M. Richard in the Iberian Peninsula, here we recompile information of its variability, taxonomy, nomenclature and chorology. Two taxa are recognized: Nigritella austriaca subsp. iberica (Teppner & E. Klein) L. Sáez, comb. nov. and N. gabasiana Teppner & Klein, and the presence of N. corneliana is excluded. Detailed phytodermologic analysis showed that size of guard cells is useful for species identification.

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Section: Phytodermologic Featuresmentioning

confidence: 98%

Section: Taxonomic Status Of Iberian Nigritellamentioning

confidence: 99%

“…The Nigritella nigra group includes three polyploid taxa that reproduce apomictically by adventitious embryos (Teppner, 1996). Nigritella nigra subsp.…”

Section: Taxonomic Status Of Iberian Nigritellamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sáez¹

2004

Anal. Jard. Bot. Madr.

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Engineering apomixis in crops

2023

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Apomixis is an asexual mode of reproduction through seeds where progeny are clones of the mother plants. Naturally apomictic modes of reproduction are found in hundreds of plant genera distributed across more than 30 plant families, but are absent in major crop plants. Apomixis has the potential to be a breakthrough technology by allowing the propagation through seed of any genotype, including F1 hybrids. Here, we have summarized the recent progress toward synthetic apomixis, where combining targeted modifications of both the meiosis and fertilization processes leads to the production of clonal seeds at high frequencies. Despite some remaining challenges, the technology has approached a level of maturity that allows its consideration for application in the field.

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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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Adventitious embryony inNigritella (Orchidaceae)

Cited by 19 publications

References 1 publication

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Engineering apomixis in crops

Polyploidy and polyembryony in Anemopaegma (Bignonieae, Bignoniaceae)

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