Cytomixis in pollen mother cells of Urochloa panicoides P. Beauv. (Poaceae).

Basavaiah,; Murthy, T. C. Shivashankara

doi:10.1508/cytologia.52.69

Cited by 46 publications

(31 citation statements)

References 16 publications

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“…The phenomenon of cytomixis, coined by Gates (1911), is reported here for the first time in the species. Cytomixis only occurs in the tetraploid and not in the diploid individuals in S. diandra, confirming the views of earlier workers that the phenomenon of chromatin transfer is more prevalent in polyploids than their diploid counterparts (Kamra 1960, Semyarkhina and Kuptsou 1974, Basavaiah and Murthy 1987, Sheidai and Attaei 2005, Singhal et al 2007. Chromatin transfer occurred through long sized cytoplasmic channels forming 1-2 chromatin strands involving 2 PMCs in 1.52-5.88% cases from late stages of meiosis-I and continued up to T-II.…”

Section: Discussionsupporting

confidence: 84%

Phenomenon of Cytomixis and Intraspecific Polyploidy (2x, 4x) in Spergularia diandra (Guss.) Heldr. & Sart. in the Cold Desert Regions of Kinnaur District (Himachal Pradesh)

Kaur

Singhal

2012

CYTOLOGIA

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Summary Spergularia diandra (Guss.) Heldr. & Sart. (Family: Caryophyllaceae), worked out presently from the valleys of Ganjul and Hangrang in the Kinnaur district of Himachal Pradesh, exhibits intraspecific diploid (2x=n=9) and tetraploid (4x=n=18) cytotypes. The species has been worked out chromosomally for the first time from India and adds a new 4x cytotype to the already existing 2x cytotype known from outside of India. The individuals of 2x cytotype are restricted to the Ganjul Valley while those of 4x cytotype are present in Hangrang valley. The individuals of the 2x and 4x cytotypes could be distinguished on the basis of habit, plant size, number of branches, bushy nature, and fleshiness and size of leaves. The diploid plants showed spindle abnormalities during meiosis resulting into heterogeneous sized fertile/stained pollen grains and some pollen sterility (10.00-12.00%). On the other hand, some plants of 4x cytotype showed the phenomenon of cytomixis involving chromatin transfer among proximate meiocytes, and chromatin stickiness resulting into 5.00-8.00% unstained/sterile pollen grains. The cytomixis in the 4x cytotype is the first ever record for the species and seems to be a natural phenomenon under direct genetic control as the plants with and without cytomixis grow under the same environmental conditions.

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Section: Discussionsupporting

confidence: 84%

Phenomenon of Cytomixis and Intraspecific Polyploidy (2x, 4x) in Spergularia diandra (Guss.) Heldr. & Sart. in the Cold Desert Regions of Kinnaur District (Himachal Pradesh)

Kaur

Singhal

2012

CYTOLOGIA

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“…Among the 36 genotypes evaluated 10 were affected, and for each double-cross hybrid at least one of their parental inbred line were also equally affected. The intergenotypic differ- ences observed may have been caused by an imbalanced genetic system in response to fluctuations in environmental conditions, as also proposed by Basavaiah and Murthy (1987). According to Nirmala and Kaul (1994), the photoperiod and/or the temperature alter the frequency of cells affected by cytomixis.…”

Section: Discussionmentioning

confidence: 88%

Cytomixis in Maize Microsporocytes.

Caetano

Pagliarini

1997

CYTOLOGIA

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“…There are some factors related to cytomixis occurrence in plants, as high temperatures, herbicides and pesticides treatments, crop culture condition, for instance (Basavaiah and Murthy 1987, Pierozzi and Benatti 1998, Bellucci et al 2003. The cytomictic channels observed in ramie PMCs may be the result of a failure in callose deposition at the points of plasmodesma connections, leading to gaps in microsporocytes primary pectocelullosic wall, as proposed by Pacini et al (1986) in sweet cherry.…”

Section: Discussionmentioning

confidence: 94%