Botany - Research Publications
Permanent URI for this collectionhttps://kr.cup.edu.in/handle/32116/32
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Item Transcriptomic investigations of gene networks in response to arsenic accumulation in Brassica juncea (L.) Czern & Coss(Central University of Punjab, 2019) Thakur, Sapna; Bhardwaj, PankajArsenic (As), a widespread toxic metalloid is class I carcinogen known to cause adverse health effects in human. In the present study, As accumulation potential and differential gene expression in B. juncea is investigated. The amount of arsenic accumulated varied in the range of 15.99 to 1138.70 mg/Kg on dry weight basis in five cultivars. A decrease in chlorophyll content and increase in membrane damage and enzymatic activities of antioxidants was observed with increase in As concentration in the B. juncea cultivars. Using maximum As accumulating cultivar (RLM514), a total of 10,870 significantly differentially expressed transcripts in response to As treatment were identified. Further, the pathway analysis revealed a large scale reprogramming of genes involving carbon metabolism (2.5%), plant hormone signaling (1.4%), and glutathione metabolism (0.6%). Moreover, a comparative account of Cd toxicity revealed a total of 11,294 transcripts to be significantly differentially expressed. The genes related to response to chemical, oxidative stress, transport, and secondary metabolism were upregulated whereas multicellular organismal development, developmental process, photosynthesis were downregulated by Cd treatment. Furthermore, 616 membrane transport proteins were found to be significantly differentially expressed. Cd-related transporters such as metal transporter (Nramp1), metal tolerance protein (MTPC2, MTP11), cadmiumtransporting ATPase, and plant cadmium resistance protein (PCR2, PCR6) were upregulated while cadmium/zinc- transporting ATPase (HMA2, HMA3, HMA4), highaffinity calcium antiporter (CAX1), and iron transport protein (IRT1) were downregulated by Cd treatment. Pathway analysis revealed signaling cascades including plant hormones signaling, MAPK signaling and Ca signaling was modulated suggesting their role in Cd-stress tolerance. The regulation overview using MapMan also revealed gene expression related to plant hormones, calcium regulation and MAP kinases were altered under Cd-stress.Item Comparative Transcriptome Profiling Under Cadmium Stress Reveals the Uptake and Tolerance Mechanism in Brassica juncea(Springer, 2019) Thakur, Sapna; Choudhary, Shurti; Bhardwaj, PankajCadmium (Cd) is a biologically non-essential and phytotoxic heavy metal pollutant. In this study, we estimated the Cd accumulation potential of Indian mustard and identified factors responsible for Cd uptake, tolerance, and detoxification. Eight transcriptomic libraries were sequenced and ??230 million good quality reads were generated. The alignment rate against B. juncea reference genome V1.5 varied in the range of 85.03-90.06%. Comparative expression analysis using DESeq2 revealed 11,294 genes to be significantly differentially expressed under Cd treatment. The agriGO singular enrichment analysis revealed genes related to response to chemical, oxidative stress, transport, and secondary metabolic process were upregulated, whereas multicellular organismal development, developmental process, and photosynthesis were downregulated by Cd treatment. Furthermore, 616 membrane transport proteins were found to be significantly differentially expressed. Cd-related transporters such as metal transporter (Nramp1), metal tolerance protein (MTPC2, MTP11), cadmium-transporting ATPase, and plant cadmium resistance protein (PCR2, PCR6) were upregulated whereas cadmium/zinc-transporting ATPase (HMA2, HMA3, HMA4), high-affinity calcium antiporter (CAX1), and iron transport protein (IRT1) were downregulated by Cd treatment. A total of 332 different gene-networks affected by Cd stress were identified using KAAS analysis. Various plant hormones signaling cascades were modulated suggesting their role in Cd stress tolerance. The regulation overview using MapMan analysis also revealed gene expression related to plant hormones, calcium regulation, and MAP kinases were altered under Cd stress.