Karyotype of Aloe barbadensis Mill.: A reinvestigation.

Sapre, A. B.

doi:10.1508/cytologia.43.237

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…According to Stebbins (1971) karyotype asymmetry of A. vera is 3B type. These fi ndings support earlier observations of chromosome constitution for A. vera (Sapre 1978;Das et al 2010; Gunjan and Roy 2010).…”

Section: Karyomorphology Of Mitotic Metaphase Chromosomessupporting

confidence: 92%

“…Karyotype studies are regarded as an important cytogenetical tool for elucidating taxonomic and phylogenetic relationships vis a vis their usefulness in breeding programme aimed at developing superior genotypes (Stace 2000;Singh 1984). Aloaceae, one of the most stable angiosperm families for karyotypic orthoselection shows an extremely uniform chromosome constitution with 2n=2x=14, comprised of eight long and six short chromosomes and shows a bimodal karyotype complement (Sapre 1978). Aloe vera chromosome complement is characterized by eight long subtelocentric chromosomes and six short submetacentric chromosomes (Figs.…”

Section: Karyomorphology Of Mitotic Metaphase Chromosomesmentioning

confidence: 99%

“…Yet, its importance is partly associated with general interest in plant reproduction and fertility and partly with greater understanding of genome constitution and its exploitation. In contrast to spontaneous mitotic chromosomal aberrations (Vig 1968;Sapre 1975), somatic chromosome characteristics (Sapre 1978;Umesh and Ranganath 2003;Das et al 2010), including the fl uorescent metaphase chromosomes (Alam and Khanam 2005) reported earlier throwing light on the structure and behaviour of mitotic chromosomes, meiotic behaviour especially of prophase I chromosomes is inadequate. The present study aims at providing a comprehensive account of the structure and behaviour of meiotic as well as mitotic chromosomes of A. vera.…”

mentioning

confidence: 98%

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Meiotic chromosome behaviour and karyomorphology of Aloe vera (L.) Burm. f.

Chaudhari

Chaudhary

2012

Chromosome Botany

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Aloe vera (L.) Burm. f. (the family Aloaceae) indigenous to Africa is an admired medicinal plant used as a folk medicine. Meiotic division was investigated in A. vera with a view to decipher the behavior of chromosomes during prophase I and the subsequent stages of meiosis following acetocarmine squash technique. The various meiotic stages from leptotene to pollen development were studied. Seven bivalents were clearly visible at diplotene, and the chiasma frequency averaged to 1.86 per bivalent and 13.1 per pollen mother cell (PMC). Prophase I stages are diffi cult to identify due to clumping of chromosome threads. Second nuclear division, however, allows clear distinction of chromosome confi guration. Besides clumping, various other types of chromosomal aberrations such as stickiness and fragments at metaphase I, precocious movement of chromosomes, bridges, laggards and unequal separation of chromosomes at anaphase I and unequal separation of chromosomes at telophase II were noted. Karyomorphological study on the other hand, was carried out in anther wall (mitotic) cells of A. vera. Mitotic as well as meiotic studies in the species showed 2n=14 chromosomes including two pairs of sat-chromosomes. The karyotype of the species was adjudged to be typically asymmetric.

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Section: Karyomorphology Of Mitotic Metaphase Chromosomessupporting

confidence: 92%

Section: Karyomorphology Of Mitotic Metaphase Chromosomesmentioning

confidence: 99%

mentioning

confidence: 98%

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Meiotic chromosome behaviour and karyomorphology of Aloe vera (L.) Burm. f.

Chaudhari

Chaudhary

2012

Chromosome Botany

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“…The genus Aloe is diversified and distributed mainly in drier areas of the old world, especially in Africa. The genus is very distinct by morphological characteristics and shares some common cytological characters i.e., basic chromosome number (x)=7 and has bimodal karyotype i.e., six small chromosomes and eight large chromosomes (Sapre 1978, Vij et al 1980, Takahashi et al 1997, Brandham and Doherty 1998. TF% in A. vera was reported at 22.21 by Gunjan and Roy (2010);24.83 and 20.64 by Nejatzadeh-Barandozi and Akbari (2013), while in the present investigation we have got 20.8 in A. trinervis.…”

Section: Resultscontrasting

confidence: 39%

Cytology of <i>Aloe trinervis</i> (Asphodelaceae): A Newly Described Species from Indian Desert

Gosavi¹,

Madhav²,

Kulloli

2023

CYTOLOGIA

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Aloe trinervis C.S.Purohit, Kulloli & Suresh Kumar has only species described from India and has narrow distribution in the state of Rajasthan. A. trinervis is related to the A. vera (L.) Burm.f. but very distinct by the vegetative and reproductive characteristics. Thus, in the present investigation, somatic chromosome number and karyotype analysis are reported for the first time in A. trinervis. The karyotype of the species is the 1C asymmetric category of Stebbins classification and the karyotypic formula is 2n=14=6sm+8st.

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“…La unión entre cromátidas hermanas durante mitosis, e inclusive el mantenimiento de tales puentes después de la citocinesis, puede explicar la presencia de micronúcleos de tamaño y número variable en el interior de los microsporocitos primarios, como consecuencia de la ruptura de dichos puentes a diferentes niveles de longitud (Jackson 1985). En este sentido, la correspondencia entre el número máximo de puentes y micronúcleos observados en esta investigación y el número de cromosomas somáticos (2n = 2x = 8L + 6S), que integran el cariotipo bimodal de A. vera según Sapre (1978), Imery y Caldera (2002), Albornoz e Imery ( 2003), entre otros, sugiere que las fusiones e intercambios atípicos entre cromátidas hermanas deben ocurrir exclusivamente en cromosomas grandes.…”

Section: Cuadrounclassified

Inestabilidad cariológica durante la formación de células madres del polen en Aloe vera (Aloaceae)

Buiza¹

2007

RBT

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Karyological instability during pollen mother cells formation in Aloe vera (Aloaceae). In order to clarify possible cytogenetic anomalies that reduce pollen fertility, premeiotic mitosis was studied in Aloe vera plants from a naturalized population in the northeast of Venezuela (10°34'15'' N and 64°12'08'' W). Karyological configurations were evaluated during the stage of cell proliferation leading to the formation of pollen mother cells (PMCs). The sampling was carried out in March 2005, choosing inflorescences without mechanical or biological damage from 25 plants selected at random. Flower buds (FB) 2 to 6 mm in length were collected from 7:00 AM through 6:00 PM, their perianths removed, and fixed in Carnoy I (3:1 ethanol/glacial acetic acid) for 24 h and stored in ethanol (70 % v/v) until observation. Light microscope observations were done on temporary preparations obtained by overflowing anther content suspended in acetic orcein (1.5 % w/v) for 5 min and softly squashing with the cover slip. A total of 9 411 cells were analyzed. Upper mitotic activity was observed in FB from 3.8 ± 0.09 mm long, collected at 11:00 AM through 1:00 PM; 17% of PMCs showed one to eight sister chromatid bridges from anaphase to telophase; 13%, one to seven micronucleus of variable diameter (0.9 to 4.8 µm); 8.1% were united by thin chromatin filaments, and 0.1% lacked a nucleus. Other evaluated cells (61.8%) had apparently normal mitotic configurations, without considerable morphometric variations. The evident irregular proliferation of a PMCs fraction (39.2%) suggests that environmental stress conditions (day temperatures ranging 32.7 to 39.8ºC, high solar radiation and low humidity) induce chromosome instability and physiologic changes that affect the normal development during premeiotic mitosis. As a consequence, loss or addition of chromosome fragments can occur in association with deficiencies and gene duplications. Rev. Biol.

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Karyotype of Aloe barbadensis Mill.: A reinvestigation.

Cited by 5 publications

References 8 publications

Meiotic chromosome behaviour and karyomorphology of Aloe vera (L.) Burm. f.

Meiotic chromosome behaviour and karyomorphology of Aloe vera (L.) Burm. f.

Cytology of <i>Aloe trinervis</i> (Asphodelaceae): A Newly Described Species from Indian Desert

Inestabilidad cariológica durante la formación de células madres del polen en Aloe vera (Aloaceae)

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