Botany - Research Publications

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Now showing 1 - 8 of 8
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    Drought priming induced thermotolerance in wheat (Triticum aestivum L.) during reproductive stage; a multifaceted tolerance approach against terminal heat stress
    (Elsevier Masson s.r.l., 2023-06-23T00:00:00) Kumar, Rashpal; Adhikary, Arindam; Saini, Rashmi; Khan, Shahied Ahmed; Yadav, Manisha; Kumar, Sanjeev
    In wheat (Triticum aestivum L.), terminal heat stress obstructs reproductive functioning eventually leading to yield loss. Drought priming during the vegetative stage can trigger a quicker and effective defense response against impending high temperature stress and improve crop production. In the present study, two contrasting wheat cultivars (PBW670 and C306) were subjected to moderate drought stress of 50�55% ?eld capacity for eight days during the jointing stage to generate drought priming (DP) response. Fifteen days after anthesis heat stress (36 �C) was imposed for three days and physiological response of primed, and non-primed plants was assessed by analyzing membrane damage, water status and antioxidative enzymes. Heat shock transcription factors (14 TaHSFs), calmodulin (TaCaM5), antioxidative genes (TaSOD, TaPOX), polyamine biosynthesis genes and glutathione biosynthesis genes were analyzed. GC-MS based untargeted metabolite profiling was carried out to underpin the associated metabolic changes. Yield related parameters were recorded at maturity to finally assess the priming response. Heat stress response was visible from day one of exposure in terms of membrane damage and elevated antioxidative enzymes activity. DP reduced the impact of heat stress by lowering the membrane damage (ELI, MDA & LOX) and enhancing antioxidative enzyme activity except APX in both the cultivars. Drought priming upregulated the expression of HSFs, calmodulin, antioxidative genes, polyamines, and the glutathione biosynthesis genes. Drought priming altered key amino acids, carbohydrate, and fatty acid metabolism in PBW670 but also promoted thermotolerance in C306. Overall, DP provided a multifaceted approach against heat stress and positive association with yield. � 2023 Elsevier Masson SAS
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    Genetic dissection of quantitative traits loci identifies new genes for gelatinization parameters of starch and amylose-lipid complex (Resistant starch 5) in bread wheat
    (Elsevier Ireland Ltd, 2022-09-08T00:00:00) Rahim, Mohammed Saba; Kumar, Vinay; Roy, Joy
    Starch is a major component of cereal grains such as wheat. Physicochemical and functional properties of starch affect end-use food quality and nutrients. To improve cultivars that preserve superior starch quality, the genetic foundation of the wheat starch and amylose-lipid complex (ALc, Resistant starch type 5) gelatinization are needed. This genome-wide association (GWA) mapping used 192 wheat genotypes (previously reported) to generate SNPs using an enhanced version of sequencing termed ddRAD on the Illumina Hi-seq X platform and 3696 high-quality influential SNPs were filtered out. The heterozygosity and Fst ranges in five subpopulations were 0.31�0.40 and 0.18�0.30 respectively. Nucleotide diversity and PIC ranged from 0.21 (6A) to 0.32 (2A) and 0.29 (6A) to 0.39 (4D) respectively. The Shannon waiver index was 1.7 and the whole-genome LD decay was 22 Mb at r2 = 0.38. Following FDR, 23 and 8 SNPs showed association with starch properties in the year 2017 and 2018, respectively while 93 and 20 SNPs were associated with ALc gelatinization in the year 2017 and 2018 respectively. The identified potential new genes (GSK3-alpha, RING-type domain-containing protein, Tetratricopeptide repeat, Hexosyltransferase, GLP, SNF1, and WRKY transcription factor) within LD range (?16 Kb to ?15 Mb), BLUP value, and cis and trans-position of SNPs network provide valuable information for the future wheat breeding strategy for the improvement of the starch quality trait. � 2022 Elsevier B.V.
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    High resistant starch mutant wheat �TAC 35� reduced glycemia and ameliorated high fat diet induced metabolic dysregulation in mice
    (Academic Press, 2022-03-18T00:00:00) Rahim, Mohammed Saba; Kumar, Vibhu; Mishra, Ankita; Fandade, Vikas; Kumar, Vinay; Kiran kondepudi, Kanthi; Bishnoi, Mahendra; Roy, Joy
    Dietary supplementation of low glycemic index (GI) food obtained from cereal crops is affordable and can reduce the risk of developing diseases such as diabetes, coronary heart disease, obesity and colon cancer. In this study, two high resistant starch (HRS) wheat mutant lines (�TAC 35� and �TAC 28�) showed up to 25% drop in GI compared to parent wheat variety �C 306� in mice (P ? 0.001). Further, the best low GI mutant line, �TAC 35� was used to observe its health benefit effects against high fat diet (HFD) for 10-weeks in C57BL/6J mice model. The mutant showed a significant reduction in body weight and tissues (fat, liver, spleen) weight from ?23.5 to 68.4% with respect to HFD. It also showed significant increase in glucose tolerance (41%), insulin sensitivity (28%), liver SOD (26%), serum SOD (16.3%) and significant decrease in liver H2O2 (29%) and serum H2O2 (35%), LDL (39%) and total cholesterol (7%), pro-inflammatory markers: IL-6 (9.56%) and TNF? (23.32%). Furthermore, the HRS diet fostered a healthy bacterial population and resulted in a profound boost in butyrate (40%), lactate (23%), and acetate (28%). Besides, the HRS diet's preventative efficacy was also revealed by the expression of disease-related genes. This study emphasizes the critical health benefits of HRS-low GI wheat which may be promoted for obese and diabetic populations. � 2022 Elsevier Ltd
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    Carotenoid cleavage dioxygenases (HD-CCD1A and B) contribute as strong negative regulators of ?-carotene in Indian bread wheat (cv. HD2967)
    (Springer Science and Business Media Deutschland GmbH, 2021-04-16T00:00:00) Thakur, Nandita; Flowerika; Thakur, Neha; Khan, Shahirina; Pandey, Ajay K.; Tiwari, Siddharth
    Wheat (Triticum aestivum L.) is the most common cereal crop that is considered to be deficient in provitamin A carotenoids. Carotenoids are prone to degrade into apocarotenoids by the activity of carotenoid cleavage dioxygenases (CCDs). Hence, in this study, multiple CCDs were cloned from commercial Indian wheat cultivar HD2967 to understand their role in provitamin A carotenoids degradation. The homoeolog specific expression of HD-CCD1 and HD-CCD4 at different grain filling stages revealed the higher expression of transcripts arising from the A and B subgenomes of HD-CCD1. Furthermore, the grain development stages showed a strong negative correlation of HD-CCD1A (r = ? 0.969) and B (r = ? 0.970) homoeologs expression to that of ?-carotene accumulation. It suggested that they could be potentially involved in deciding the turn-over of ?-carotene in wheat grain. Three-dimensional (3D) structures for all six homoeologs of HD-CCD1 and HD-CCD4 were predicted using maize VP14 template to gain better insight into their molecular mechanism. Ramachandran plot assessment revealed that ~ 90% of residues are in the most favoured region. Docking studies with various carotenoid substrates revealed the higher affinity of HD-CCD1A and B for ?-carotene and ?-cryptoxanthin. Bacterial complementation analysis validated the functional role of all six homoeologs with HD-CCD1B showing the highest activity followed by HD-CCD1A for ?-carotene degradation. Results of this study provide valuable insights into the characteristics of HD-CCDs in wheat and thereby justifying them (HD-CCD1A and B) as the candidate genes for employing genome editing tools for developing ?-carotene enriched wheat grains. � 2021, King Abdulaziz City for Science and Technology.
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    Drought priming induced thermotolerance in wheat (Triticum aestivum L.) during reproductive stage; a multifaceted tolerance approach against terminal heat stress
    (Elsevier Masson s.r.l., 2023-06-23T00:00:00) Kumar, Rashpal; Adhikary, Arindam; Saini, Rashmi; Khan, Shahied Ahmed; Yadav, Manisha; Kumar, Sanjeev
    In wheat (Triticum aestivum L.), terminal heat stress obstructs reproductive functioning eventually leading to yield loss. Drought priming during the vegetative stage can trigger a quicker and effective defense response against impending high temperature stress and improve crop production. In the present study, two contrasting wheat cultivars (PBW670 and C306) were subjected to moderate drought stress of 50�55% ?eld capacity for eight days during the jointing stage to generate drought priming (DP) response. Fifteen days after anthesis heat stress (36 �C) was imposed for three days and physiological response of primed, and non-primed plants was assessed by analyzing membrane damage, water status and antioxidative enzymes. Heat shock transcription factors (14 TaHSFs), calmodulin (TaCaM5), antioxidative genes (TaSOD, TaPOX), polyamine biosynthesis genes and glutathione biosynthesis genes were analyzed. GC-MS based untargeted metabolite profiling was carried out to underpin the associated metabolic changes. Yield related parameters were recorded at maturity to finally assess the priming response. Heat stress response was visible from day one of exposure in terms of membrane damage and elevated antioxidative enzymes activity. DP reduced the impact of heat stress by lowering the membrane damage (ELI, MDA & LOX) and enhancing antioxidative enzyme activity except APX in both the cultivars. Drought priming upregulated the expression of HSFs, calmodulin, antioxidative genes, polyamines, and the glutathione biosynthesis genes. Drought priming altered key amino acids, carbohydrate, and fatty acid metabolism in PBW670 but also promoted thermotolerance in C306. Overall, DP provided a multifaceted approach against heat stress and positive association with yield. � 2023 Elsevier Masson SAS
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    Genetic dissection of quantitative traits loci identifies new genes for gelatinization parameters of starch and amylose-lipid complex (Resistant starch 5) in bread wheat
    (Elsevier Ireland Ltd, 2022-09-08T00:00:00) Rahim, Mohammed Saba; Kumar, Vinay; Roy, Joy
    Starch is a major component of cereal grains such as wheat. Physicochemical and functional properties of starch affect end-use food quality and nutrients. To improve cultivars that preserve superior starch quality, the genetic foundation of the wheat starch and amylose-lipid complex (ALc, Resistant starch type 5) gelatinization are needed. This genome-wide association (GWA) mapping used 192 wheat genotypes (previously reported) to generate SNPs using an enhanced version of sequencing termed ddRAD on the Illumina Hi-seq X platform and 3696 high-quality influential SNPs were filtered out. The heterozygosity and Fst ranges in five subpopulations were 0.31�0.40 and 0.18�0.30 respectively. Nucleotide diversity and PIC ranged from 0.21 (6A) to 0.32 (2A) and 0.29 (6A) to 0.39 (4D) respectively. The Shannon waiver index was 1.7 and the whole-genome LD decay was 22 Mb at r2 = 0.38. Following FDR, 23 and 8 SNPs showed association with starch properties in the year 2017 and 2018, respectively while 93 and 20 SNPs were associated with ALc gelatinization in the year 2017 and 2018 respectively. The identified potential new genes (GSK3-alpha, RING-type domain-containing protein, Tetratricopeptide repeat, Hexosyltransferase, GLP, SNF1, and WRKY transcription factor) within LD range (?16 Kb to ?15 Mb), BLUP value, and cis and trans-position of SNPs network provide valuable information for the future wheat breeding strategy for the improvement of the starch quality trait. � 2022 Elsevier B.V.
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    High resistant starch mutant wheat �TAC 35� reduced glycemia and ameliorated high fat diet induced metabolic dysregulation in mice
    (Academic Press, 2022-03-18T00:00:00) Rahim, Mohammed Saba; Kumar, Vibhu; Mishra, Ankita; Fandade, Vikas; Kumar, Vinay; Kiran kondepudi, Kanthi; Bishnoi, Mahendra; Roy, Joy
    Dietary supplementation of low glycemic index (GI) food obtained from cereal crops is affordable and can reduce the risk of developing diseases such as diabetes, coronary heart disease, obesity and colon cancer. In this study, two high resistant starch (HRS) wheat mutant lines (�TAC 35� and �TAC 28�) showed up to 25% drop in GI compared to parent wheat variety �C 306� in mice (P ? 0.001). Further, the best low GI mutant line, �TAC 35� was used to observe its health benefit effects against high fat diet (HFD) for 10-weeks in C57BL/6J mice model. The mutant showed a significant reduction in body weight and tissues (fat, liver, spleen) weight from ?23.5 to 68.4% with respect to HFD. It also showed significant increase in glucose tolerance (41%), insulin sensitivity (28%), liver SOD (26%), serum SOD (16.3%) and significant decrease in liver H2O2 (29%) and serum H2O2 (35%), LDL (39%) and total cholesterol (7%), pro-inflammatory markers: IL-6 (9.56%) and TNF? (23.32%). Furthermore, the HRS diet fostered a healthy bacterial population and resulted in a profound boost in butyrate (40%), lactate (23%), and acetate (28%). Besides, the HRS diet's preventative efficacy was also revealed by the expression of disease-related genes. This study emphasizes the critical health benefits of HRS-low GI wheat which may be promoted for obese and diabetic populations. � 2022 Elsevier Ltd
  • No Thumbnail Available
    Item
    Carotenoid cleavage dioxygenases (HD-CCD1A and B) contribute as strong negative regulators of ?-carotene in Indian bread wheat (cv. HD2967)
    (Springer Science and Business Media Deutschland GmbH, 2021-04-16T00:00:00) Thakur, Nandita; Flowerika; Thakur, Neha; Khan, Shahirina; Pandey, Ajay K.; Tiwari, Siddharth
    Wheat (Triticum aestivum L.) is the most common cereal crop that is considered to be deficient in provitamin A carotenoids. Carotenoids are prone to degrade into apocarotenoids by the activity of carotenoid cleavage dioxygenases (CCDs). Hence, in this study, multiple CCDs were cloned from commercial Indian wheat cultivar HD2967 to understand their role in provitamin A carotenoids degradation. The homoeolog specific expression of HD-CCD1 and HD-CCD4 at different grain filling stages revealed the higher expression of transcripts arising from the A and B subgenomes of HD-CCD1. Furthermore, the grain development stages showed a strong negative correlation of HD-CCD1A (r = ? 0.969) and B (r = ? 0.970) homoeologs expression to that of ?-carotene accumulation. It suggested that they could be potentially involved in deciding the turn-over of ?-carotene in wheat grain. Three-dimensional (3D) structures for all six homoeologs of HD-CCD1 and HD-CCD4 were predicted using maize VP14 template to gain better insight into their molecular mechanism. Ramachandran plot assessment revealed that ~ 90% of residues are in the most favoured region. Docking studies with various carotenoid substrates revealed the higher affinity of HD-CCD1A and B for ?-carotene and ?-cryptoxanthin. Bacterial complementation analysis validated the functional role of all six homoeologs with HD-CCD1B showing the highest activity followed by HD-CCD1A for ?-carotene degradation. Results of this study provide valuable insights into the characteristics of HD-CCDs in wheat and thereby justifying them (HD-CCD1A and B) as the candidate genes for employing genome editing tools for developing ?-carotene enriched wheat grains. � 2021, King Abdulaziz City for Science and Technology.