Normal microspore production after cell fusion in Brachiaria jubata (Gramineae)

Mendes-Bonato, Andréa Beatriz; Risso-Pascotto, Claudicéia; Pagliarini, Maria Suely; Valle, Cacilda Borges do

doi:10.1590/s1415-47572003000400016

Cited by 18 publications

(7 citation statements)

References 22 publications

(18 reference statements)

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“…Also this low temperature stress conditions prevailing in the presently investigated area might lead the amalgamation of PMCs and pollen grains. These syncyte PMCs have earlier recorded in Brachiaria jubata [45], Chrysanthemum [46], and Lindelofia longifolia var. falconeri [47].…”

Section: Discussionsupporting

confidence: 67%

Meiotic abnormalities affect genetic constitution and pollen viability in dicots from Indian cold deserts

Kaur

Singhal

2019

BMC Plant Biol

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BackgroundMeiotic abnormalities lead to morphological and genetic variations which caused not only to evolution but also intraspecific reproductive barriers. During present study of detailed meiotic course in dicotyledonous plants sampled from Indian cold deserts, various meiotic abnormalities have been detected. For this, the plant materials fixed in Carnoy’s fixative and studied detailed meiotic course by standard squash method in 1% acetocarmine.ResultsMeiotic abnormalities have been presently detected in 71 species which include multiple associations in diploids (Achillea millefolium L.), multivalents and univalents in polyploids (4 species), cytomixis (40 species), chromosome stickiness (20 species), nonsynchronous disjunction of bivalents (32 species), interbivalent connections (15 species), synaptic mutants (2 species), syncyte meiocytes (2 species), abnormal spindles (7 species), and fusion of pollen grains (1 species), laggards and chromatin bridges, hypo-, hyperploid PMCs, monads, dyads, triads, tetrads with micronuclei and polyads.ConclusionsConsequently, variable sized apparently fertile pollen grains and considerable amount of sterile pollen grains are resulted as end products which lead to different genetic constitution (aneuploids and polyploids) and curtailed sexual reproductive success in these species.

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Section: Discussionsupporting

confidence: 67%

Meiotic abnormalities affect genetic constitution and pollen viability in dicots from Indian cold deserts

Kaur

Singhal

2019

BMC Plant Biol

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“…Syncyte formation has been recorded from Fabaceae (Sarbhoy 1980), Poaceae (Levan 1941;Caetano-Pereira et al 1999;Mendes-Bonato et al 2003;Boldrini et al 2006), and Solanaceae (Padmaja 1988) and thus may be a common phenomenon in angiosperms. Nevertheless, it is not reported as frequently as gametic non-reduction.…”

Section: Discussionmentioning

confidence: 98%

Syncyte formation in the microsporangium of Chrysanthemum (Asteraceae): a pathway to infraspecific polyploidy

2009

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Polyploidy, which is thought to have played an important role in plant evolution and speciation, is prevalent in Chrysanthemum (x = 9). In fact, polyploid series are known in C. zawadskii (2x, 4x, 6x, 8x, and 10x) and C. indicum (2x, 4x, and 6x), but the mechanism by which polyploidization occurs is unknown. Here we show that in diploid individuals of both C. zawadskii and C. indicum, the fusion between two adjacent pollen mother cells (PMCs) occurs at a frequency of 1.1-1.3% early in the first meiotic division. While possessing the chromosomes of both PMCs, the fused cell or syncyte undertakes subsequent meiotic division processes as a single large PMC, producing four 2n pollen grains that are able to germinate. Despite their low frequency, syncyte formation may have played a major role in the production of infraspecific polyploids in Chrysanthemum.

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“…& De Not.) Stapf (Mendes‐Bonato et al, 2001, 2003), Brachiaria humidicola (Rendle) Schweick. (Boldrini et al, 2006), Brachiaria dictyoneura (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Since the first report of syncyte formation through cell fusion in Lactuca sativa L. by Gates & Rees (1921), a number of cases have been reported (Levan, 1941; Price, 1956; Katayama, 1964; Mehra & Kalia, 1973; Sarbhoy, 1980; Padmaja, 1988; Caetano‐Pereira et al, 1999; Mendes‐Bonato et al, 2001, 2003; Boldrini et al, 2006; Risso‐Pascotto et al, 2006; Singhal & Kumar, 2008; Kim et al, 2009; Kumar et al, 2010, 2011). We here record for the first time the formation of syncytes and consequently 2 n or double‐sized pollen grains in the accession of L. longiflora var.…”

Section: Discussionmentioning

confidence: 99%

Syncytes during male meiosis resulting in 2n pollen grain formation in Lindelofia longiflora var. falconeri

Singhal

Rana

Kumar

2011

J of Sytematics Evolution

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Lindelofia longiflora (Royle ex Benth.) Baill. var. falconeri (Cl.) Brand (Family: Boraginaceae) is investigated cytologically (n= 12) for the first time from the cold deserts of Pangi Valley, Chamba District (Himachal Pradesh) in India. We report the formation of syncytes and 2n pollen grains in the species. During meiosis, the majority of the pollen mother cells (PMCs) exhibited 12 bivalents, equal segregation of chromosomes during anaphases, regular tetrads, and normal‐sized pollen grain formation. Occasionally, two proximate PMCs fused during the early stages of prophase‐I and resulted in the formation of syncytes. The frequency of syncytes in the accession is rather low, at 25 out of 1866 (1.33%). Such syncyte PMCs are detectable during meiosis due to their larger size compared to typical PMCs. The syncytes or polyploid cells showed normal 24 bivalents and depicted perfectly regular meiotic course. But the products of such PMCs yield 2n or larger sized pollen grains that are almost double the size of typical normal or n pollen grains. The origin of syncytes as a consequence of the fusion of meiocytes during the early stages of meiosis‐I could be attributed to low temperature stress conditions prevailing in the Pangi Valley, where temperature during May and June dip to below freezing, the time the plants enters the reproductive/flowering bud stage. It is possible that such apparently fertile 2n pollen grains originating from syncytes might play a role in the origin of intraspecific polyploids in the species.

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Normal microspore production after cell fusion in Brachiaria jubata (Gramineae)

Cited by 18 publications

References 22 publications

Meiotic abnormalities affect genetic constitution and pollen viability in dicots from Indian cold deserts

Meiotic abnormalities affect genetic constitution and pollen viability in dicots from Indian cold deserts

Syncyte formation in the microsporangium of Chrysanthemum (Asteraceae): a pathway to infraspecific polyploidy

Syncytes during male meiosis resulting in 2n pollen grain formation in Lindelofia longiflora var. falconeri

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