Cytogenetical Studies in Relation to the Origin and Differentiation of Species in the Genus<i>Solanum</i>L.

Magoon, M. L.; Ramanujam, S.; Cooper, D. C.

doi:10.1080/00087114.1962.10796057

Cited by 57 publications

(20 citation statements)

References 191 publications

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“…In the diploid hybrids, regular chromosome pairing at pachytene, diakinesis and MI were most commonly observed (Magoon et al ., 1958a(Magoon et al ., , 1958bDvoiak, 1983) . Irregularities, such as multiple associations, univalents, delayed separation of bivalents, bridges with or without fragments, etc ., have been seldom, suggesting that structural differences between chromosomes are not common (For a review, see Magoon et al ., 1962) .…”

Section: Introductionmentioning

confidence: 99%

Spontaneous structural rearrangements in Solanum tuberosum ssp. phureja: 1. Chromosome identification at pachytene stage

Wagenvoort¹

1988

Euphytica

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Meiosis was studied from pachytene and onwards in two clones of S.t. ssp . phureja . At pachytene the bivalents of S . t. ssp . phureja appeared to be morphologically very similar to those of S . t. ssp . tuberosum cv .Gineke . Cross-shaped quadrivalent configurations at pachytene confirmed the presence of a heterozygous interchange . From the configurations at pachytene it was identified that the short arm of chromosome 3 and possibly one of the arms of chromosome 12 was involved in the interchange .In addition, several abnormalities were observed : these included the occurrence of loops in eu-and heterochromatic parts, non-homologous pairing and centromere associations between different bivalents .

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Section: Introductionmentioning

confidence: 99%

Spontaneous structural rearrangements in Solanum tuberosum ssp. phureja: 1. Chromosome identification at pachytene stage

Wagenvoort¹

1988

Euphytica

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“…workers also considered S. nigrum as an auto-hexaploid (Jorgensen 1928, Ellison 1936, Nakamura 1935, 1937 or an auto-allopolyploid , containing two sets of identi cal genomes and one from a diploid species as yet unidentified (Stebbins 1950, G unther 1959, Magoon et al 1962, Rao 1971 of different genotypes and ecotypes in constituting the species-complex is sug gested. Polyploidy, chromosomal alteration, hybridization followed by natural selection, gene mutation and isolating mechanisms had been the main factors in its evolution.…”

Section: Discussionmentioning

confidence: 99%

Cytomorphological studies of dodecaploid (12x) Solanum nigrum Linn.

Singh¹,

Roy²

1985

CYTOLOGIA

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A study on Solanum nigrum in India was started by Bhaduri (1933) who recog nized three cytological races, namely diploid, tetraploid and hexaploid with 12 as the basic number, constituting a distinct polyploid series. In the strict sense, S. nigrum can be broken up into a number of taxa distinguishable from one another on the basis of morphology and cytological features. The naturally occurring hexa ploid S. nigrum populations of Varanasi are morphologically similar to the arti ficially produced hexaploid by Tandon andRao (1966, 1974), Venkateswarlu and Rao (1971, 1972) and Khan et al. (1972), while the diploid S. nodiflorum (2n=24) and the tetraploid S. villosum (2n=4x=48) are found in southern part of India, the hexaploid S. nigrum (2n=6x=72) extends far beyond to Japan (Nakamura 1937) and the Himalayas. Bhaduri (1951) associated those with black colour of the berries to the diploid and hexaploid while bright orange ones to the natural tetra ploid forms. The Nigerian species has black fruits and is hexaploid (Omidijii 1975).It is generally accepted that the genecological differentiation of plant popula tions is the result of natural selection and that products are adapted to the parti cular local habitat condition. From this point a ployploid complex will be a source of interest as it provides a system in wihch the mechanism of evolution of higher chromosomal forms and its effects on the process of speciation can not only be studied but also experimentally verified. The present study is an attempt in this direction. A review of available literature shows that S. nigrum has received con siderable attention from a number of workers in so far as its chromosome number, karyotype, meiotic analysis, breeding system and ploidy status are concerned, but none has dealt with the induction of a high level of ploidy in it with the help of colchicine. This was achieved for the sake of writing this paper which furnishes informations on its cytomorphology and the possibility of its adjustment to thrive under local conditions which only support the hexaploid cytotype. Materials and methodsOf the many seedlings raised of the local hexaploid S. nigrum, 24 healthy ones were selected and their apical buds covered with cotton wool plugs kept moist with 0.20 to 0.50 per cent colchicine solution by continuously wetting the plugs at the interval of eight hours for three consecutive days.A set of control plants were maintained for the purpose of comparison. Observations on the induced poly

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“…Such meiotic discrepancies have been observed in hybrid plants of Paeonia (STEBBINS, 1938;STEBBINS and ELLERTON, 1939;WALTERS, 1952); Lilium (BROCK, 1954); Tradescantia (GILES> 1940); Bromus (WALTERS> 1950) and Elymus (STEBBINS et al> 1946;HENEENJ 1963a> 1963b. The observation of cross shaped configurations at pachytene, chains, interlocked bivalents and multivalents at diakinesis, which are characteristic of plants with relatively large segmental interchanges of chromosomes indicate that the constituent sets of chromosomes of the parent species of I. tubulosa may differ in a number of translocations as has been reported in genera like Campanula (DARLINGTON and GAIRDNER, 1937); Paeonia (STEBBINS and ELLERTON, 1939); Oenothera (CATCHESIDE, 1931, CLELAND, 1940; Datura (BERGNER, 1943) and Solanum (MAGOON et al, 1958a(MAGOON et al, , 1962.…”

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confidence: 89%

The Cytology ofIochroma Tubulosa Benth

Madhavadian

1967

Caryologia

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Cytogenetical Studies in Relation to the Origin and Differentiation of Species in the GenusSolanumL.

Cited by 57 publications

References 191 publications

Spontaneous structural rearrangements in Solanum tuberosum ssp. phureja: 1. Chromosome identification at pachytene stage

Spontaneous structural rearrangements in Solanum tuberosum ssp. phureja: 1. Chromosome identification at pachytene stage

Cytomorphological studies of dodecaploid (12x) Solanum nigrum Linn.

The Cytology ofIochroma Tubulosa Benth

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