Cytomorphological Studies of Spontaneous and Artificial Triploids and Their Role in the Evolution of Hexaploid Solanum nigrum L.

Singh, R. N.; Sahi, A. N.; Tiwari, D. N.

doi:10.1508/cytologia.57.1

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Although not all diploids are isolated from the tetraploids to the same extent; some species seemed to have diverged enough as to be unable to cross as seed parents while others still remained at a lower level of differentiation retaining the ability to cross with tetraploids, either as seed or pollen parents. In this study the lower ploidy plant S. chenopodioides was successfully used as the seed parent as was found by Singh et al (1992) but found as exception by Venkateswarlu and Roa (1972).…”

Section: Discussionmentioning

confidence: 60%

Hybridization Studies of Five Species of the Solanum Nigrum Complex Found in South Africa and two Cocktail Tomato Cultivars

Jacoby

Labuschagne

2006

Euphytica

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Section: Discussionmentioning

confidence: 60%

Hybridization Studies of Five Species of the Solanum Nigrum Complex Found in South Africa and two Cocktail Tomato Cultivars

Jacoby

Labuschagne

2006

Euphytica

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“…The rarity of triploids is due to the triploid block, which results in massive abortion of triploid seeds because of the failure of the endosperm to develop normally (Bretagnolle and Thompson 1995) and also in part due to their innate sterility (Burnham 1962;Schultz-Schaeffer 1980;Singh et al 1992;Lee et al 1994). Therefore, the production of a triploid plant is a rare event and its inability to reproduce sexually decreases its chance of persisting in nature.…”

Section: Neiõs Distancementioning

confidence: 99%

Genetic Evidence that Lomatia tasmanica (Proteaceae) is an Ancient Clone

Lynch¹,

Barnes²,

Cambecèdes³

et al. 1998

Aust. J. Bot.

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Lomatia tasmanica W.M.Curtis is an endangered species with only one population. The population occurs over a distance of 1.2 km and consists of several hundred stems. Although it flowers occasionally, fruit production has never been observed, and it propagates vegetatively. The genetic diversity in L. tasmanica, and its relationship with the other species of this genus in Tasmania was investigated using allozyme analysis and chromosome counts. Sixteen isozyme loci were scored on 78 L. tasmanica plants collected from throughout the range of the species. No genetic diversity was found in L. tasmanica. Lomatia tinctoria possessed 22 (2n = 22) chromosomes, like other Lomatia species previously counted, while L. tasmanica had 33 to 29 chromosomes, which makes it an unstable triploid. The triploid nature of L. tasmanica would explain its lack of genetic diversity and its apparent sterility. This suggests that the entire species may be one genet, one of the largest plant clone ever found. Fossilised leaves identified as L. tasmanica by Jordan et al. (1991) and dated as at least 43 600 years old may indicate the minimum age of this genet. This clone maybe one the worldÕs oldest known living plant individual. IntroductionLomatia tasmanica W.M.Curtis is an endangered shrub species, restricted in distribution to south-western Tasmania. It was first collected by D. King in May 1934. However, this population appears to have since become extinct. A flowering specimen from a second population was later collected by D. King in 1965. This specimen was sent to J. H. Willis for identification and the plant was described by W. M. Curtis in 1967. Only one population is currently known. The species is found along creek gullies in rainforest in south-western Tasmania.Interestingly, the species has never been observed to form mature fruit and seeds. It has been observed to flower but not annually. Regeneration appears to be vegetative by rhizome (Brown and Gray 1985). W. M. Curtis suggested that the species may be of hybrid origin (A. M. Gray, pers. comm., to Brown and Gray 1985). Brown and Gray (1985) further speculated that L. polymorpha may be a parent, since it grows in the vicinity. Lomatia tinctoria was considered a less likely parent because it does not presently grow in the vicinity of L. tasmanica. The objectives of this study were firstly to estimate the level of genetic diversity within L. tasmanica using allozyme analysis and, secondly, to determine the genetic distinctiveness of L. tasmanica from the other Tasmanian Lomatia species, L. tinctoria and L. polymorpha, using allozyme analysis and chromosome counts.

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Solanum nigrum (black nightshade)

2021

CABI Compendium

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Cytomorphological Studies of Spontaneous and Artificial Triploids and Their Role in the Evolution of Hexaploid Solanum nigrum L.

Cited by 3 publications

References 13 publications

Hybridization Studies of Five Species of the Solanum Nigrum Complex Found in South Africa and two Cocktail Tomato Cultivars

Hybridization Studies of Five Species of the Solanum Nigrum Complex Found in South Africa and two Cocktail Tomato Cultivars

Genetic Evidence that Lomatia tasmanica (Proteaceae) is an Ancient Clone

Solanum nigrum (black nightshade)

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