Molecular characterization of major and minor rDNA repeats and genetic variability assessment in different species of mahseer found in North India

Kumar, Ravindra; Singh, Mamta; Kushwaha, Basdeo; Nagpure, N. S.; Mani, Indra; Lakra, W. S.

doi:10.1016/j.gene.2013.06.032

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…Even within a single species, there could be genetic variability among seeds. Different individuals within the same species might have slight genetic variations, leading to variations in germination characteristics, including the time it took for seeds to germinate [ 60 ]. This genetic diversity could contribute to the inconsistent germination times observed.…”

Section: Discussionmentioning

confidence: 99%

The Role of Silica Nanoparticles in Promoting the Germination of Tomato (Solanum lycopersicum) Seeds

et al. 2023

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The addition of nanoparticles has been reported to be an effective strategy for enhancing seed germination, but the underlying mechanisms whereby this occurs are unclear. In the present study, we added silica nanoparticles (SiNPs) to an aqueous growth medium in which tomato seeds were germinated. We examined the effects of SiNPs on growth and possible mechanisms of action. SiNPs had a diameter of 10–17 nm and 110–120 nm. SiNPs shortened the mean germination time from 5.24 ± 0.29 days to 4.64 ± 0.29 days. Seedling vigor, measured by criteria including length and weight, was also improved compared to the control condition. The presence of SiNPs in the seedlings was assessed using an X-ray fluorescence spectrometer. The nanoparticles may have promoted germination by enhancing water imbibition by the seeds or altering the external microenvironment. Scanning electron microscopy revealed changes in the seed coat during germination, many of which were only observed in the presence of nanoparticles. Soil bacteria affect germination; specifically, Bacillus sp. may promote germination. The number of Bacillus sp. changed in the germination medium with SiNPs compared to the control. This suggested that these bacteria could interact with SiNPs to promote germination.

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Section: Discussionmentioning

confidence: 99%

The Role of Silica Nanoparticles in Promoting the Germination of Tomato (Solanum lycopersicum) Seeds

et al. 2023

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“…Whilst research efforts on the genus have accelerated in recent years ( Fig. 1), this has been heavily skewed towards aquaculture (Kumar et al 2013;Norfatimah et al 2014;Raman et al 2016). While some of these studies provide strong contributions to the Tor taxonomic knowledge base (Hora 1939;Roberts 1999;Walton et al 2017), many fail to reference original species descriptions, type localities and lack the integration of morphological data that would assist field biologists (Nguyen et al 2008;Mani et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Mahseer (Tor spp.) fishes of the world: status, challenges and opportunities for conservation

Pinder

Britton

Harrison

et al. 2019

Rev Fish Biol Fisheries

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The mahseer fishes (Tor spp.) represent an iconic genus of large-bodied species of the Cyprinidae family. Across the 16 recognised species in the genus, individual fish can attain weights over 50 kg, resulting in some species being considered as premier sport fishes. Tor species also generally have high religious and cultural significance throughout South and Southeast Asia. Despite their economic and cultural importance, the status of Tor fishes has been increasingly imperilled through their riverine habitats being impacted by anthropogenic activities, such as hydropower dam construction and exploitation. Moreover, conservation efforts have been constrained by knowledge on the genus being heavily skewed

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Evidence of birth-and-death evolution of 5S rRNA gene in Channa species (Teleostei, Perciformes)

Barman

Singh

et al. 2016

Genetica

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In higher eukaryotes, minor rDNA family codes for 5S rRNA that is arranged in tandem arrays and comprises of a highly conserved 120 bp long coding sequence with a variable non-transcribed spacer (NTS). Initially the 5S rDNA repeats are considered to be evolved by the process of concerted evolution. But some recent reports, including teleost fishes suggested that evolution of 5S rDNA repeat does not fit into the concerted evolution model and evolution of 5S rDNA family may be explained by a birth-and-death evolution model. In order to study the mode of evolution of 5S rDNA repeats in Perciformes fish species, nucleotide sequence and molecular organization of five species of genus Channa were analyzed in the present study. Molecular analyses revealed several variants of 5S rDNA repeats (four types of NTS) and networks created by a neighbor net algorithm for each type of sequences (I, II, III and IV) did not show a clear clustering in species specific manner. The stable secondary structure is predicted and upstream and downstream conserved regulatory elements were characterized. Sequence analyses also shown the presence of two putative pseudogenes in Channa marulius. Present study supported that 5S rDNA repeats in genus Channa were evolved under the process of birth-and-death.

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Molecular characterization of major and minor rDNA repeats and genetic variability assessment in different species of mahseer found in North India

Cited by 10 publications

References 37 publications

The Role of Silica Nanoparticles in Promoting the Germination of Tomato (Solanum lycopersicum) Seeds

The Role of Silica Nanoparticles in Promoting the Germination of Tomato (Solanum lycopersicum) Seeds

Mahseer (Tor spp.) fishes of the world: status, challenges and opportunities for conservation

Evidence of birth-and-death evolution of 5S rRNA gene in Channa species (Teleostei, Perciformes)

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