An Asynaptic Mutation in Soybean(Glycine max(L.) Merrill) Associated with Total Absence of Sister Chromatid Cohesiveness.

Bione, Nilton Cesar Pires; Pagliarini, Maria Suely; Almeida, Leones Alves de

doi:10.1508/cytologia.67.177

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…The present study shows the species to be a synaptic mutant. As for pollen fertility it is found to be very low (45-72%) and is in accordance with the previous observations of asynaptic mutant in Soyabean (Bione et al 2002) and Cluster Bean (Sahoo and Gill 1975). In contrast to this, a very high percentage of pollen fertility was estimated in desynaptic mutants in Corchorus fascicularis (Maity and Datta 2009).…”

Section: Resultssupporting

confidence: 92%

A Case of Synaptic Mutant in Erigeron karvinskianus DC. (Latin American Fleabane)

et al. 2010

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Summary Failure of chromosome pairing was observed in all the presently investigated natural populations of Erigeron karvinskianus (2nϭ36). All 4 populations were observed with a different range of univalents besides bivalents at diakinesis and metaphase I. The presence of univalents bound with various other meiotic irregularities, such as laggards and chromatin bridges, which further lead to abnormal microsporogenesis. Pollen sterility was found to be high.

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Section: Resultssupporting

confidence: 92%

A Case of Synaptic Mutant in Erigeron karvinskianus DC. (Latin American Fleabane)

et al. 2010

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“…This may be attributed to the mutations in the genes governing homologous chromosome pairing as also reported by Reddy et al (1991). The occurrence of univalent, ring and rod bivalents due to the mutagenic treatments was also previously reported by Mansour (1994), Bione et al (2002a), and Vinita et al (2004). Bridges/fragments and laggards were also noticed in all the three groups of mutagenic treatments except laggards in EMS treatment in Pusa-16.…”

Section: Discussionsupporting

confidence: 81%

Cytological effects of different mutagens in soybean [Glycine max (L.) Merrill]

Khan¹,

Tyagi²

2009

Front. Agric. China

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The effect of gamma rays, ethyl methane sulphonate, and their three combinations on various cytological parameters in M 1 generation was studied in two soybean cultivars, Pusa-16 and PK-1042. Combined treatments exhibited high meiotic abnormalities in Pusa-16 as compared with the individual treatments of ethyl methane sulphonate and gamma rays. In PK-1042 the highest frequency of meiotic abnormalities was exhibited by gamma rays, while in Pusa-16 the frequencies of univalents were high as compared with other meiotic abnormalities. Fragments/bridges, laggards, ring and rod bivalents were other types of meiotic abnormalities that were noticed in both the cultivars. The frequencies of irregular cells in the two cultivars were high in combined treatments followed by ethyl methane sulphonate and gamma rays. The highest percentage of pollen sterility was exhibited by the combined treatments and the lowest was exhibited by gamma rays. In Pusa-16, the increase in doses of gamma rays and ethyl methane sulphonate increased the pollen sterility percentage, while in the combined treatments, the increase was noticed up to the intermediate dose and then gradually decreased at higher doses. On the other hand, in PK-1042 the increase in ethyl methane sulphonate dose increased sterility percentage, while no definite trend was noticed in gamma rays and combined treatments.

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“…This also support our view that the present plant is of asynaptic type. Though asynapsis of spontaneous origin has been reported in diploid soybean (Bione et al 2002a) but asynapsis of spontaneous origin in an induced autotetraploid of Glycine has not been reported yet.…”

Section: Discussionmentioning

confidence: 99%

Asynaptic Variations in Induced Autotetraploid of Soybean

Kumar

Rai

2007

CYTOLOGIA

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Summary While working on colchiploidy in Glycine max, asynaptic variations was observed in the C 2 generation. The cytology and meiotic behaviour of this asynaptic tetraploid was studied. High and variable number of univalents were observed in this plant at diakinesis and metaphase I stage. In some of the PMCs 80 univalents could also be observed at diakinesis stage. The main and distinctive characteristic of the variant was the inability of the univalent chromosomes to congregate at the equatorial plate, so that typical figures of metaphase I were never observed. The stages were hardly distinguishable and these were only identified on the basis of increase in chromosome number due to sister chromatid separation at anaphase II. Because of this abnormal meiotic behaviour aberrated tetrads were formed that gave rise to sterile pollen grains and pods were not formed. Some extrinsic or intrinsic agent might have acted on some genes responsible for synapsis and chiasma formation and resulted in complete disruption of chiasma assembly. Synaptic aberrations are potentially important source of information on the chiasma maintenance mechanism especially in a case when the system under study is an induced autotetraploid.

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An Asynaptic Mutation in Soybean(Glycine max(L.) Merrill) Associated with Total Absence of Sister Chromatid Cohesiveness.

Cited by 10 publications

References 24 publications

A Case of Synaptic Mutant in Erigeron karvinskianus DC. (Latin American Fleabane)

A Case of Synaptic Mutant in Erigeron karvinskianus DC. (Latin American Fleabane)

Cytological effects of different mutagens in soybean [Glycine max (L.) Merrill]

Asynaptic Variations in Induced Autotetraploid of Soybean

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