Morphological and Ecological Adaptations, and Cytological Studies in &lt;i&gt;Astragalus rhizanthus&lt;/i&gt; Royle ex Benth. (Papilionaceae), an Endemic to Himalayas

Kumar, Puneet; Singhal, Vijay Kumar

doi:10.1508/cytologia.81.155

Cited by 3 publications

(1 citation statement)

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“…Pollen fertility and sterility were studied for some spineless taxa of Astragalus (Khan et al, 2022a). The results of the current investigation are supported by the pollen fertility and sterility findings in multiple Astragalus species by various authors (Kita et al 1993; Latterell and Townsend 1994; Massoud et al 2011; Rana et al 2012; Kumar and Singhal 2016). However, the results of the present palynological study also show significant variation in pollen fertility and sterility (Table 2).…”

Section: Discussionsupporting

confidence: 87%

Contribution to the pollen morphology of Astragalus L. section Aegacantha Bunge (Galegeae-Fabaceae) and its systematic significance

Khan,

Ahmad,

Sultan

et al. 2023

Palynology

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Astragalus L. sect. Aegacantha Bunge includes 57 described species, mostly confined to Southwest Asia and Central Asia. We studied the pollen morphology of 17 species of this section present in Pakistan. Pollen morphology of sect. Aegacantha species is poorly investigated despite its systematic importance. The main aim of this study is to determine and document the pollen characters that can assist in the taxonomic identification of species in this difficult section. Pollen slides were prepared following acetolysis and examined by both light and scanning electron microscopy. Pollen size varies, with the polar axis ranging from 32.91 to 43.10 µm and the equatorial axis from 22.91 to 28.47 µm. Pollen is sub-prolate (1.15–1.33) to prolate (1.34–2.00) in shape, small to medium in size, radially symmetrical, isopolar, trizonocolporate to tricolporate, and monad. Sculpture variations (i.e. reticulate, microreticulate, perforate, microperforate, regulate, microregulate and granulate) were observed around the apertural, meridional and polar regions. Ordination analysis (principal component analysis (PCA)) revealed that the quantitative characters of pollen morphology are the most reliable characters for delimitation of species within section Aegacantha. Cluster analysis (unweighted pair group method using arithmetic average (UPGMA)) shows a partial relationship between the Aegacantha taxa clustered based on pollen characters and supports the general morphology. Further, this study shows that the pollen traits provide a baseline for phylogenetic optimisation in the investigated Aegacantha section.

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Section: Discussionsupporting

confidence: 87%

Contribution to the pollen morphology of Astragalus L. section Aegacantha Bunge (Galegeae-Fabaceae) and its systematic significance

Khan,

Ahmad,

Sultan

et al. 2023

Palynology

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Cytomixis in plants: facts and doubts

Mursalimov

Дейнеко

2017

Protoplasma

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The migration of nuclei between plant cells (cytomixis) is a mysterious cellular phenomenon frequently observable in the male meiosis of higher plants. Cytomixis attracts attention because of unknown cellular mechanisms underlying migration of nuclei and its potential evolutionary significance, since the genetic material is transferred between the cells that form pollen. Although cytomixis was discovered over a century ago, the advance in our understanding of this process has been rather insignificant because of methodological difficulties. The data that allowed for a new insight into this phenomenon were obtained by examining the migrating nuclei with electron and confocal laser microscopy, immunostaining, and fluorescence in situ hybridization. As has been shown, the chromatin migrating between cells is surrounded by an undamaged nuclear membrane. Such chromatin does not undergo heterochromatization and contains normal euchromatin markers. The condensation degree of the migrating chromatin corresponds to the current meiotic stage, and normal structures of synaptonemal complex are present in the migrating part of the nucleus. The cells involved in cytomixis lack any detectable morphological and molecular markers of programmed cell death. It has been shown that individual chromosomes and genomes (in the case of allopolyploids) have no predisposition to the migration between cells, i.e., parts of the nucleus are involved in cytomixis in a random manner. However, the fate of migrating chromatin after it has entered the recipient cell is still vague. A huge amount of indirect data suggests that migrating chromatin is incorporated into the nucleus of the recipient cell; nonetheless, the corresponding direct evidences are still absent. No specific markers of cytomictic chromatin have been yet discovered. Thus, the causes and consequences of cytomixis are still disputable. This review briefs the recent data on the relevant issues, describes the classical and modern methodological approaches to analysis of the intercellular migration of nuclei, and discusses the problems in cytomixis research and its prospects.

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Karyotype and Chromosome Behavior Analyses in Three Regions of the Indomalayan Realm

Kawano

2018

CYTOLOGIA

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The Wada Memorial Award was created in 2011 to encourage the submission of high-quality papers to Cytologia. Coincidentally, the first to fourth holders of the award were experts in karyotype and chromosome analyses among the three regions of the Indomalayan biogeographic realm. Most of Indomalaya was originally covered by tropical and subtropical moist broadleaf forests, with high biodiversity that is currently at risk due to various anthropogenic influences. Karyotype and chromosome analyses provide an essential foundation for maintaining biodiversity through conservation; therefore, in this paper, we focus recent their contributions of the early Wada Memorial Award winners to the three regions of Indomalayan

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Morphological and Ecological Adaptations, and Cytological Studies in <i>Astragalus rhizanthus</i> Royle ex Benth. (Papilionaceae), an Endemic to Himalayas

Cited by 3 publications

References 44 publications

Contribution to the pollen morphology of Astragalus L. section Aegacantha Bunge (Galegeae-Fabaceae) and its systematic significance

Contribution to the pollen morphology of Astragalus L. section Aegacantha Bunge (Galegeae-Fabaceae) and its systematic significance

Cytomixis in plants: facts and doubts

Karyotype and Chromosome Behavior Analyses in Three Regions of the Indomalayan Realm

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