Cytomorphological behaviour of primary trisomics in pearl millet (Pennisetum americanum (L.) Leeke).

Kumar, Rahul; Singh, R. B.; Singh, R. M.

doi:10.1508/cytologia.47.503

Cited by 8 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The normal pentamerous characteristic of flower has been modified conspicuously by the increased number of sepals and/or petals in trisomic types I and III, but reduced number of sepals in type VI. Specific modifications in particular plant part/s and other morphological features were used to identify and differentiate complete set of primary trisomic in Datura (Avery et al 1959), pearl millet (Gill et al 1970, Virmani and Gill 1971, SaiKumar et al 1982, Vari and Bhowal 1986, rice (Hu 1968, Iwata et al 1970, Misra et al 1986, tomato (Rick andBurton 1954, Rick et al 1964), pea (Gottschalk and Milutinovic 1973), barley (Tsuchiya 1960, 1967, Singh and Prasad 2000, rye (Kamanoi andJenkins 1962, Fujigaki andTsuchiya1988 ), Petunia (Pulliah and Padmaja 1998), Beta vulgaris (Kaltsikes and Evans 1967, Ramagosa et al 1986, 1987 and jute (Iyer 1968).…”

Section: Discussionmentioning

confidence: 99%

Retraction: Seven Different Primary Trisomics in Grass Pea (<i>Lathyrus sativus</i> L.). I. Cytogenetic Characterisation

Talukdar

Biswas

2007

CYTOLOGIA

View full text Add to dashboard Cite

Summary Isolation of seven different types of trisomics was possible in the advanced generations of an induced trisomic recovered earlier in grass pea cultivar BioR-231. The trisomic plants were phenotypically distinguishable from the diploid mother cultivar (2nϭ14) by their contrasting morphological characteristics and cytologically by the presence of an extra chromosome (2nϩ1ϭ15). Variations in several morphological traits were distinctive and stable in different trisomic plants during succeeding generations. Among the phenotypic manifestations, modifications in leaflet morphology, stipule character and seed coat colour were specific for each of the seven types of trisomics. The different trisomics could be distinguished instantly from one another by the characteristic shape, number, position and orientation of leaflets as well as stipules. Since leaflet character was specific and distinctly visible at the very seedling stage it could be used conveniently as a marker character for identification and classification of seven trisomics. Moreover, apical modification of leaflet, complete absence or occurrence of stipule in different forms and variations in floral morphology were also conspicuously different in different types. The extra chromosome appeared as univalent or in trivalent association and the trivalents occurring only in linear or frying pan or Y shaped configuration characterized all of the 7 types as primary types. Pollen sterility and reduced seed yield in these trisomic types might be the consequences of unequal separation, formation of laggard and anaphase bridge.Key words Seven primary trisomics, Cytogenetics, Grass pea.A trisomic plant of grass pea detected earlier in the R 2 generation (1997-98) raised through gamma ray irradiation was cytogenetically characterized (Biswas 1998, Biswas and Biswas 2002, 2004. Trisomic plants of grass pea possessing relatively medium sized, low number of chromosome are convenient for evaluation of cytogenetic consequences. Further investigation in the trisomic plants was, therefore, carried out by maintaining them through self pollination and conspicuously different types of trisomics evolved with distinctive phenotypic modifications in succeeding generations were identified by their cytomorphological peculiarities, protein profiles and isozyme banding patterns. In the present text, cytogenetic characteristics manifested in the seven types of trisomics isolated in grass pea have been illustrated. Materials and methodsFresh seed materials were collected during the winter season 1999-2000 from the trisomic plants of grass pea maintained in the authors' laboratory by growing selfed R 3 progeny of an induced trisomic recovered earlier through irradiation with 35 KR gamma rays (Biswas 1998). Initially the trisomic plants were distinguished from the mother diploid cultivar BioR-231 by their characteristic morphological peculiarities observed at different stages of growth and development from © 2007 The Japan Mendel Society Cytologia 72(4): [385][386][387][388][389][390...

show abstract

Section: Discussionmentioning

confidence: 99%

Retraction: Seven Different Primary Trisomics in Grass Pea (<i>Lathyrus sativus</i> L.). I. Cytogenetic Characterisation

Talukdar

Biswas

2007

CYTOLOGIA

View full text Add to dashboard Cite

show abstract

“…[7]. However, tetrasomics, tetratrisomics or multiple trisomics have been reported to occur in many plants [5,6,16,17,24]. A series of aneuploids from nullisomics (2n-2; 2n=18) to hexasomics (2n+4; 2n= 24) [19][20][21][22] and an octosomic plant [23] have been reported from natural populations of C. gigantea.…”

Section: Discussionmentioning

confidence: 99%

Cytological studies in a pentasomic of 2n = 12 Coix taxon

Barve

Sangeetha

2011

Nucleus

View full text Add to dashboard Cite

Among a natural population of Coix aquatica Roxb., a pentasomic (2n+3; 2n=15) was isolated and studied cytologically for the first time. The extra homologous chromosomes in the plant behaved normally, as they did not disturb the rest of the bivalents through meiosis except for the stickiness and rare occurrence of a few univalents and chromosome fragments. The majority of pollen mother cells (PMCs) showed five bivalents and a pentavalent at diakinesis. The different anaphase segregations led to the formation of hypo-and hyper-ploid male gametes from n-1 (n=5) to n+4 (n=10) chromosomal constitutions. Although the chromosomal configurations towards the later stages were found to be sticky in most of the meiocytes, the meiosis was clean, giving rise to pollens that appeared to be normal. The plant yielded a few fertile seeds also. The origin of this higher polysomic is considered to be through the fusion of male and female super haploid gametes produced by the trisomics that arose from the 2n=12 Coix taxon.

show abstract

Mutation: Higher Plants

Gottschalk

1985

Progress in Botany

View full text Add to dashboard Cite

Cytomorphological behaviour of primary trisomics in pearl millet (Pennisetum americanum (L.) Leeke).

Cited by 8 publications

References 7 publications

Retraction: Seven Different Primary Trisomics in Grass Pea (<i>Lathyrus sativus</i> L.). I. Cytogenetic Characterisation

Retraction: Seven Different Primary Trisomics in Grass Pea (<i>Lathyrus sativus</i> L.). I. Cytogenetic Characterisation

Cytological studies in a pentasomic of 2n = 12 Coix taxon

Mutation: Higher Plants

Contact Info

Product

Resources

About