Cytogenetics of Vicia. I. Male meiotic system in twelve species.

Kesavacharyulu, K.; Raina, S. N.; Verma, R. C.

doi:10.1508/cytologia.47.511

Cited by 4 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the genus Vicia side-arm bridges had been reported in several species from the north hemisphere: V cracca (Rousi 1962), V faba, V sativa and V narbonensis (Srivastava 1963), V hajastana and V hybrida (Kesavacharyulu et al 1982).…”

Section: Thementioning

confidence: 99%

“…Of all the species of the genus, V faba is the most extensively studied from the cytogenetical point of view. Otherwise, detailed studies of the male meiotic system that take into account chromosome associations, genetic recombination, crossing-over, position and localization of chiasmata and distribution of bivalents to the poles, have been reported for only a few more species of the north hemisphere (Kesavacharyulu et al 1982). To the best of our knowledge, similar studies have not been published for South American species of the genus where reports are restricted to chromosome numbers (Palacios 1971, Moore andScotter 1976).…”

mentioning

confidence: 98%

See 1 more Smart Citation

The Male Meiotic System in Three South American Species of Vicia (Fabaceae).

Palermo

Ferrari²,

Naranjo

2001

CYTOLOGIA

View full text Add to dashboard Cite

Male meiosis of 3 South American species of the genus Vicia (V graminea Sm., V macrograminea Burk., V epetiolaris Burk.) was studied. The early meiotic prophase I was characterized by a "bouquet stage" or synizesis. All 3 species showed regular pairing with 7 bivalents per cell at diakinesis and metaphase I. V macrograminea and V epetiolaris presented similar meiotic configurations at both stages, with higher values of total chiasmata per cell and a lower proportion of terminal chiasmata. V graminea was significantly different in chiasmata behaviour since the populations studied presented lower chiasma frequency and distal localization. The number of ring bivalents per cell in metaphase I was lower in V graminea but not significant. The distribution of chromosomes to the poles in anaphase I as well as the course of the second meiotic division were regular in all 3 species, though bridges without fragments were occasionally observed in anaphase I. These side-arm bridges generally resolve successfully, since the fertility is high (>90%) in all cases. The occurrence of these bridges in species of Vicia from the north hemisphere and in the South American species studied, suggests that non-disjunction could have play a role in the evolution of the basic number of the genus, where the earliest basic number is regarded as x=7 , from which x=6 and x=5 arose.

show abstract

Section: Thementioning

confidence: 99%

mentioning

confidence: 98%

The Male Meiotic System in Three South American Species of Vicia (Fabaceae).

Palermo

Ferrari²,

Naranjo

2001

CYTOLOGIA

View full text Add to dashboard Cite

show abstract

Genome Organisation and Evolution in the Genus Vicia

Raina

1990

Biological Approaches and Evolutionary Trends in Plants

View full text Add to dashboard Cite

Ecological correlates of chiasma frequency and recombination index of plants

Koella

1993

Biological Journal of the Linnean Society

View full text Add to dashboard Cite

This paper tests four theories of the maintenance of genetic recombination using published chiasma frequencies of 194 plant species representing 15 families of angiosperms. The theories are that recombination is favoured by environmental unpredictability, by fluctuating selection, by mutational load or by sib-competition. The level of genetic recombination was approximated by recombination index and by the number of excess chiasmata. Both measures were higher in animaldispersed than in other species and increased as dispersal distance decreased. This association was found at all taxonomic levels. Chiasma frequency was not associated with life span of the species. Recombination index was lower in perennial than in annual species, but the reverse trend was observed among genera. Number of chiasmata per bivalent tended to decrease as the number of chromosomes increased, but this association was statistically insignificant at all taxonomic levels. No association was found between number of chiasmata per cell and nuclear DNA content.These patterns did not support the theories that environmental unpredictability or fluctuating selection due to parasite pressure favour recombination, and they offered only very little support for the theory that recombination is favoured so that mutational load can be decreased. The only theory that was consistent with the observed data is the sib-competition theory, which suggests that genetic recombination is maintained so that the intensity of competition with sibs is reduced.

show abstract

Cytogenetics of Vicia. I. Male meiotic system in twelve species.

Cited by 4 publications

References 39 publications

The Male Meiotic System in Three South American Species of Vicia (Fabaceae).

The Male Meiotic System in Three South American Species of Vicia (Fabaceae).

Genome Organisation and Evolution in the Genus Vicia

Ecological correlates of chiasma frequency and recombination index of plants

Contact Info

Product

Resources

About