Cytogenetical investigations in colchicine-induced tetraploids of Cyamopsis tetragonoloba L

Sangeeta Bewal, Jigyasa Purohit, Arun Kumar, Rajkumari Khedasana and Satyawada Rama Rao
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Sangeeta Bewal: Cytogenetics and Molecular Biology Laboratory, Department of Botany, Jai Narain Vyas University, Jodhpur, Rajasthan, India
Jigyasa Purohit: Cytogenetics and Molecular Biology Laboratory, Department of Botany, Jai Narain Vyas University, Jodhpur, Rajasthan, India
Arun Kumar: Cytogenetics and Molecular Biology Laboratory, Department of Botany, Jai Narain Vyas University, Jodhpur, Rajasthan, India
Rajkumari Khedasana: Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong, Meghalaya, India
Satyawada Rama Rao: Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong, Meghalaya, India

Czech Journal of Genetics and Plant Breeding, 2009, vol. 45, issue 4, 143-154

Abstract: Successful induction of autotetraploidy has been achieved in five accessions of Cyamopsis tetragonoloba L. The diploid seedlings of these accessions were treated with different concentrations of aqueous colchicine using the cotton-swab method for 10-18 hours within 2-3 days. The highest percentage of success was recorded when the seedlings were treated with 0.2% colchicine for 10 h within two days. The synthesized plants showed remarkable enhancement in several morphological and floral characters making them more robust and better plants from the food and feed aspect. Cytologically, quadrivalent frequency ranging from 3.18 to 5.45 and univalent frequency ranging from 0.08 to 1.10 were characteristic of the colchicine-induced tetraploids. Among all the associations, bivalent chromosome associations were observed more frequently (2.95 to 6.04). The anaphase I and II disjunction of bivalents/chromosomes was leading more or less regularly and equally to the formation of at least few seeds from some of the synthesized plants. Significant enhancement in morphological traits as revealed in colchicine-induced tetraploid plants having a better food and feed value and normal meiotic behaviour of synthesized autotetraploids leading to a good seed set may ultimately result in the genetic improvement of Cyamopsis tetragonoloba.

Keywords: cluster bean; genetic improvement; induced polyploidy; meiotic behaviour; quadrivalents (search for similar items in EconPapers)
Date: 2009
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjg:v:45:y:2009:i:4:id:41-2009-cjgpb

DOI: 10.17221/41/2009-CJGPB

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