Botany - Research Publications

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Author: search.filters.author.Majeed, AasimSubject: search.filters.subject.RNAseq

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    Transcriptome Analysis Revealed Behavior Complexity of Senescence Responses in Himalayan Tree Species Ulmus wallichiana
    (Springer, 2023-05-17T00:00:00) Singh, Amandeep; Majeed, Aasim; Sharma, Vikas; Gadri, Hari Shankar; Chowdhary, Md. Asif; Bhardwaj, Pankaj
    The Himalayas present a highly contrasting environment for the organisms that inhabit it, with summer and winter being the most disparate seasons. As winter approaches, the temperature drops, and deciduous plants, such as Ulmus wallichiana Planch., undergo senescence. In this study, we used the RNA-seq approach to generate a de novo transcriptome assembly of U. wallichiana, consisting of 300,067 unigenes. We investigated the differential expression pattern of these unigenes under changing climatic conditions, with a focus on the contrast between winter and summer. We observed that 2746 unigenes were differentially expressed, with a fold change of ? 2 and an FDR-adjusted p-value of ? 0.001. Among these unigenes, 37 were found to be related to senescence. We also identified nine DREB unigenes in the U. wallichiana transcriptome, which exhibited more or less contrasting patterns between summer and winter. These DREB unigenes may play an important role in regulating the plant�s tolerance to cold and/or drought stress. Our findings shed light on the complex and dynamic process of transcriptomic reprogramming that enables U. wallichiana to cope with seasonal changes. Furthermore, this study highlights the urgent need for further research on U. wallichiana, as this endangered plant species remains largely unexplored at the genomic level. � 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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    Codon usage pattern in Gnetales evolved in close accordance with the Gnetifer hypothesis
    (Oxford University Press, 2021-01-06T00:00:00) Majeed, Aasim; Kaur, Harpreet; Kaur, Amitozdeep; Das, Sreemoyee; Joseph, Josepheena; Bhardwaj, Pankaj
    The evolution of Gnetales is ambiguous, and their phylogenetic position is still debated. The biological and molecular processes may evolve with the evolutionary history of a species or a clade. The molecular/biological processes of phylogenetically similar lineages closely follow their evolutionary pattern. If Gnetales evolved as a sister to Pinaceae, cupressophytes or Coniferales as a whole, then it is expected that the molecular or biological processes may reflect this pattern of evolution. In light of this, we deciphered the codon usage pattern of Gnetales, compared it with angiosperms, Pinaceae, cupressophytes and Coniferales as a whole. We evaluated whether this important molecular process has evolved in agreement with the Anthophyte, Gnepine, Gnecup or Gnetifer hypothesis. We observed that Gnetales prefer A/U-ending codons to G/C-ending codons like other lineages. Natural selection plays a dominant role in governing the codon usage bias (CUB). The CpA/CpT dinucleotides were over-represented, whereas the CpG dinucleotide was suppressed. Hierarchical clustering (HC) and correspondence analysis (CA) on relative synonymous codon usage values of 59 synonymous codons showed Gnetales as a sister clade to Coniferales as a whole and revealed that the codon usage pattern in Gnetales has evolved in close accordance with the Gnetifer hypothesis. � 2021 The Linnean Society of London, Botanical Journal of the Linnean Society.
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    Transcriptome Analysis Revealed Behavior Complexity of Senescence Responses in Himalayan Tree Species Ulmus wallichiana
    (Springer, 2023-05-17T00:00:00) Singh, Amandeep; Majeed, Aasim; Sharma, Vikas; Gadri, Hari Shankar; Chowdhary, Md. Asif; Bhardwaj, Pankaj
    The Himalayas present a highly contrasting environment for the organisms that inhabit it, with summer and winter being the most disparate seasons. As winter approaches, the temperature drops, and deciduous plants, such as Ulmus wallichiana Planch., undergo senescence. In this study, we used the RNA-seq approach to generate a de novo transcriptome assembly of U. wallichiana, consisting of 300,067 unigenes. We investigated the differential expression pattern of these unigenes under changing climatic conditions, with a focus on the contrast between winter and summer. We observed that 2746 unigenes were differentially expressed, with a fold change of ? 2 and an FDR-adjusted p-value of ? 0.001. Among these unigenes, 37 were found to be related to senescence. We also identified nine DREB unigenes in the U. wallichiana transcriptome, which exhibited more or less contrasting patterns between summer and winter. These DREB unigenes may play an important role in regulating the plant�s tolerance to cold and/or drought stress. Our findings shed light on the complex and dynamic process of transcriptomic reprogramming that enables U. wallichiana to cope with seasonal changes. Furthermore, this study highlights the urgent need for further research on U. wallichiana, as this endangered plant species remains largely unexplored at the genomic level. � 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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    Codon usage pattern in Gnetales evolved in close accordance with the Gnetifer hypothesis
    (Oxford University Press, 2021-01-06T00:00:00) Majeed, Aasim; Kaur, Harpreet; Kaur, Amitozdeep; Das, Sreemoyee; Joseph, Josepheena; Bhardwaj, Pankaj
    The evolution of Gnetales is ambiguous, and their phylogenetic position is still debated. The biological and molecular processes may evolve with the evolutionary history of a species or a clade. The molecular/biological processes of phylogenetically similar lineages closely follow their evolutionary pattern. If Gnetales evolved as a sister to Pinaceae, cupressophytes or Coniferales as a whole, then it is expected that the molecular or biological processes may reflect this pattern of evolution. In light of this, we deciphered the codon usage pattern of Gnetales, compared it with angiosperms, Pinaceae, cupressophytes and Coniferales as a whole. We evaluated whether this important molecular process has evolved in agreement with the Anthophyte, Gnepine, Gnecup or Gnetifer hypothesis. We observed that Gnetales prefer A/U-ending codons to G/C-ending codons like other lineages. Natural selection plays a dominant role in governing the codon usage bias (CUB). The CpA/CpT dinucleotides were over-represented, whereas the CpG dinucleotide was suppressed. Hierarchical clustering (HC) and correspondence analysis (CA) on relative synonymous codon usage values of 59 synonymous codons showed Gnetales as a sister clade to Coniferales as a whole and revealed that the codon usage pattern in Gnetales has evolved in close accordance with the Gnetifer hypothesis. � 2021 The Linnean Society of London, Botanical Journal of the Linnean Society.
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    Selection constraints determine preference for A/U-ending codons in Taxus contorta
    (Canadian Science Publishing, 2020) Majeed, Aasim; Kaur, Harpreet; Bhardwaj, Pankaj
    Unequal utilization of synonymous codons is a well-known phenomenon among living organisms. This phenomenon plays a major role in the enhancement of the accuracy and efficiency of translation. Gymnosperms are rarely paid attention in this aspect. Understanding the degree of and determining the forces influencing codon usage bias (CUB) in Taxus contorta, an endangered Himalayan gymnosperm, will prove useful in interpreting the evolutionary characteristics of this species. Using RNAseq data, 93?790 assembled transcripts were clustered into 32?701 unigenes. Around 13?061 full-length sequences were utilized for the analysis of CUB. Compositional properties showed that GC-content ranged from 28.76% to 65.22%, with an average value of 44.28%, suggesting an AT-rich genome. The mean effective number of codons (ENC) value revealed that CUB is not strong in T. contorta. The preferred codons tended to be A/U ending, whereas the avoided codons tended to be G/C ending. A P2 index of 0.54 and a Mutation Responsive Index (MRI) value of-0.02 in addition to the results revealed by the neutrality, ENC, and parity plots showed that natural selection is a predominating factor governing CUB. Mutational pressure, gene length, hydropathiciy, aromaticity, and nucleotide composition influence CUB weakly