Meiosis and Pollen Mitosis in &lt;i&gt;Aloe barbadensis&lt;/i&gt; Mill. (&lt;i&gt;A. perfoliata&lt;/i&gt; var. &lt;i&gt;vera&lt;/i&gt; L., &lt;i&gt;A. vera Auth&lt;/i&gt;. non Mill.)

Sapre, A. B.

doi:10.1508/cytologia.40.525

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…Similar findings with bimodal haploid karyogram from the microspores of Aloe vera are also reported by us, although the detailed karyomorphology was not studied (Haque and Ghosh 2013). However, if we consider the types of chromosomes, Sapre (1975) and Das et al (2010) reported that all four long chromosomes are sub-telocentric. However, in the present study, we found that three of four chromosomes are subtelocentric, and the rest is sub-metacentric.…”

Section: Haploid Karyomorphology In Allium Cepa and Aloe Verasupporting

confidence: 87%

“…Conversely, in the case of three short chromosomes, our findings are corroborated by Sapre (1975), confirming two of three chromosomes are sub-metacentric, and the rest one is sub-telocentric. However, the present findings have disagreed with Das et al (2010), where they find that all three short chromosomes in the pollen grains of Aloe vera are sub-metacentric.…”

Section: Haploid Karyomorphology In Allium Cepa and Aloe Verasupporting

confidence: 62%

“…According to our information, only three reports are available to date, which demonstrates the detailed pollen karyotype including haploid karyogram and idiogram; viz. one gymnosperm Cycas pectinata and three monocotyledonous angiosperm Aloe barbadensis, Drimiopsis botryoides, and Ledebouria revoluta (Abraham and Mathew 1962, Sapre 1975. Although another article found that just haploid karyogram was represented from pollen grains of Aloe vera, in detail, karyotype was not studied (Haque and Ghosh 2013).…”

Section: Haploid Karyomorphology In Allium Cepa and Aloe Veramentioning

confidence: 99%

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Pollen Mitosis is a Good Choice for Gametophytic Chromosome Study in Higher Plants—Investigation with Allium cepa L. and Aloe vera L.

2023

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In higher groups of plants, the somatic cells are conventionally used for karyomorphological studies, which contain a diploid (2n) set of chromosomes. Similar to diploid sporophytic cells, a chromosomal study in haploid (n) gametophytic cells is also necessary as it unfolds the karyomorphological status of germ cells. The mature male gametophytic plant body (i.e., pollen grain) is only two-or three-celled structures. This study focused on the first mitotic division in a microspore, popularly known as ʻpollen mitosis-I.ʼ Allium cepa L. and Aloe vera L. are two model species for karyomorphological study. Microspores of these species have been stained with 2.0% acetocarmine. The present finding reveals that the cell division in microspores of these two species is completely normal without any significant irregularities. As expected, the chromosome number of the microspores of Allium cepa is n=8 and Aloe vera is n= 7, exactly half the number of their sporophytic plants. The haploid karyotype of Allium cepa is the symmetric type with karyotype formula ʻ6m+2sm,ʼ whereas that of Aloe vera is between symmetric and asymmetric types with karyotype formula ʻ3sm+4st.ʼ This study not only enriches the chromosomal database of gametophytes of Allium cepa and Aloe vera, but also will encourage further research on this extremely neglected topic̶chromosome study in the gametophytic generation of flowering plants. As Allium cepa and Aloe vera are easily available and model species for karyomorphological study, and with two contrast karyotypes (i.e., symmetric and asymmetric), this article also helps numerous school/college teachers to teach their students about the structure and behavior of gametophytic chromosomes.

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Section: Haploid Karyomorphology In Allium Cepa and Aloe Verasupporting

confidence: 87%

Section: Haploid Karyomorphology In Allium Cepa and Aloe Verasupporting

confidence: 62%

Section: Haploid Karyomorphology In Allium Cepa and Aloe Veramentioning

confidence: 99%

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Pollen Mitosis is a Good Choice for Gametophytic Chromosome Study in Higher Plants—Investigation with Allium cepa L. and Aloe vera L.

2023

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“…On the other hand, Baptista et al (2000) mention that the high frequency of sticky chromosomes or agglutination could be due to a genetic-environmental interaction associated with high temperatures, causing chromatin instability mainly in metaphase-I. Sapre (1975) suggests that the participation of neocentric activity in early displacement of smaller chromosomes is the main cause of dicentric bridges between large homologues; however, Imery and Cequea (2002) attributes this to early dissolution of the synaptonemal complex between small homologous chromosomes.…”

Section: Resultsmentioning

confidence: 99%

Morphological and cytogenetic characterization in experimental hybrid Aloe jucunda Reyn. x Aloe vera (L.) Burm. f. (Asphodelaceae)

Ozols-Narbona

Buiza

2023

Caryologia

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Aloe L. includes plants of economic interest worldwide for their medicinal properties and ornamental character. In this study, morphological and cytogenetic traits were evaluated in a hybrid obtained using Aloe jucunda Reyn. as pollen donor and A. vera (L.) Burm. f. as female parent, to characterize it, determine its ornamental and agronomic potentialities and aspects related to its reproduction. Conventional protocols for morphometric studies and cytogenetic analysis described for succulent plants were applied. Progeny showed intermediate expressiveness in most of the characteristics, except in the colour of the leaves and flowers (hybrid = A. jucunda), as well as for the length of teeth, number, and area of leaf spots and angle between continuous leaves, where it surpassed the expression of both parents, giving it a high ornamental value. The length, width, and thickness of the leaves improved with respect to the paternal genome, so its potential for the exploitation of the gel and latex of its leaves cannot be ruled out. Root tip cells showed a karyotype 2n = 2x = 14 = 8L + 6S = 1L(smsat) + 1L(sm) + 3L(st) + 3L(smsat) + 1S(m) + 5S(sm). Microsporogenesis showed chromosomal abnormalities in 47.4% of the meiocytes, the most frequent being micronuclei in prophase-I, sticky chromosomes in metaphase-I, one or two dicentric bridges accompanied or not by acentric fragments in anaphase-I, -II, and telophase-I, - II, as well as one or two additional microspores. These abnormalities reduce the fertility of their pollen grains and limit their sexual reproduction, providing a better explanation for their sterility.

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Aloe barbadensis Mill. (= A. vera L.)

Cavallini

Natali

Sánchez

1991

Biotechnology in Agriculture and Forestry

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Meiosis and Pollen Mitosis in <i>Aloe barbadensis</i> Mill. (<i>A. perfoliata</i> var. <i>vera</i> L., <i>A. vera Auth</i>. non Mill.)

Cited by 9 publications

References 12 publications

Pollen Mitosis is a Good Choice for Gametophytic Chromosome Study in Higher Plants—Investigation with <i>Allium cepa</i> L. and <i>Aloe vera</i> L.

Pollen Mitosis is a Good Choice for Gametophytic Chromosome Study in Higher Plants—Investigation with <i>Allium cepa</i> L. and <i>Aloe vera</i> L.

Morphological and cytogenetic characterization in experimental hybrid Aloe jucunda Reyn. x Aloe vera (L.) Burm. f. (Asphodelaceae)

Aloe barbadensis Mill. (= A. vera L.)

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