Primeiros estudos citotaxonômicos e distribuição geográfica de Rhynchosia naineckensis Fortunato (Leguminosae) para o estado de Goiás

Biondo, Elaine; Nascimento, André R. Terra; Miotto, Sílvia Teresinha Sfoggia; Schifino-Wittmann, María Teresa

doi:10.1590/2175-78602003548301

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“…It has been noted that, of the most frequent basic numbers of x=8, 11, 7 and 16 described for the subfamily Papilionoideae (Souza and Benko-Iseppon 2004), majority of the genera under tribe Phaseoleae display basic number of x=11. This includes, among others genuses, Phaseolus (Mercado-Ruaro and Delgado-Salinas 1998), Vigna (Sneff et al 1992) and Rhynkosia (Biondo et al 2003). Thus, the countings, including that of M. atropurpurea (Fig.…”

Section: Speciesmentioning

confidence: 97%

Karyomorphological studies in Mucuna of India

Jaheer¹,

Sathyanarayana²

2010

Chromosome Botany

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Mucuna Adans. is a large genus with more than 150 species of annual and perennial legumes of pantropical distribution. Despite considerable economic importance of some of its species, almost no work has been done on their cytogenetic characterization in any part of World. In this paper, we have presented a fi rst report on karyomorphological analysis in four Indian species viz., Mucuna atropurpurea, Mucuna monosperma, Mucuna nigricans and Mucuna pruriens bringing out diploid number for M. atropurpurea and karyotypic formula for all the four species. Root tips were treated with 0.002 M 8-hydroxyquinoline and temporary preparations were made after squash in aceto-carmine. Karyomorphological description for each of the species has been detailed taking into account the following features: chromosome number, total length and relative length, arm ratio of each chromosome, haploid set length and degree of asymmetry. Mitotic metaphases in all the species showed 2n=22 chromosomes. Mucuna nigricans showed two pairs of sat-chromosomes. None of the species, however, revealed identical karyotypic formula indicating occurrence of rearrangements. The haploid set length of annual M. pruriens was found to be reduced in size when compared to perennial species pointing its evolution from the latter.

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Section: Speciesmentioning

confidence: 97%