Publications of NIPGR Scientists

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Author: search.filters.author.Majee, ManojSubject: search.filters.subject.ABA

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    Phy meets ERFs to regulate seed germination
    (Elsevier B.V., 2023) Varshney, Vishal; Hazra, Abhijit; Majee, Manoj
    The complex process of seed germination is impacted heavily by environmental cues, such as light, mediated via photosensory systems and phytochromes. This pathway was discovered a long time ago, but the underlying molecular mechanisms are not fully understood. Li et al. recently showed how ETHYLENE RESPONSE FACTORs (ERFs) modulate phytochrome-mediated regulation of germination.
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    Arabidopsis ABSCISIC ACID INSENSITIVE4 targets PROTEIN L-ISOASPARTYL METHYLTRANSFERASE1 in seed
    (Springer Nature Publishing AG, 2022) Kamble, Nitin Uttam; Ghosh, Shraboni; Achary, Rakesh Kumar; Majee, Manoj
    PROTEIN L-ISOASPARTYL METHYLTRANSFERASE (PIMT) is a protein repairing enzyme (PRE) and is implicated in seed vigor and longevity. PIMT has been shown to be induced by ABA, however, its detailed regulation by ABA signaling components is unknown. Herein, we report that ABSCISIC ACID INSENSITIVE4 (ABI4) directly binds to the PIMT1 promoter and regulates its expression in Arabidopsis seeds. AtPIMT1 promoter analysis demonstrated the presence of putative ABI4 binding sites. Our Y1H analysis revealed that AtABI4 transcription factor binds to the AtPIMT1 promoter. Dual luciferase assay also demonstrated the binding of the AtABI4 transcription factor to the AtPIMT1 promoter. Subsequently, we have generated AtPIMT1 promoter GUS lines and revealed that ABA induced expression of GUS in Arabidopsis thaliana. Expression analyses exhibited reduced accumulation of PIMT1 protein and transcript with significant reduction in total PIMT activity in abi4-1 mutants as compared to that of the wild type. The AtPIMT1 promoter GUS expression in abi4-1 mutants was also found to be severely affected in both the control and ABA treatment. Hence, through molecular and genetic evidences we show that the AtABI4 plays a central role in regulating the expression of AtPIMT1 to impart seed vigor and longevity to orthodox seeds.
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    Sequestering miR165/166 enhances seed germination in Arabidopsis thaliana under normal condition and ABA treatment
    (Springer Nature Publishing AG, 2020) Sarkar Das, Shabari; Majee, Manoj; Nandi, Asis K.; Karmakar, Prakash
    Seed germination is a dynamic process involving imbibition, increased metabolic activity and protrusion of a tiny plantlet rupturing the seed coat. Many genes, phytohormones like ABA and GA have been implicated in germination of Arabidopsis thaliana seeds. Although many microRNAs (miRNAs) have been shown to be differentially expressed during seed germination process, their role remains mostly unaddressed. Here we address the role of developmentally important miR165/166 in the process of seed germination. We demonstrate that the seeds of transgenic A. thaliana having target mimic-miR165/166 (eTM-miR165/166), where miR165/166 is sponged, show better germination efficiency. The seeds of this line also maintain better germination even under ABA treatment, which is a negative regulator of seed germination. Thus, our results suggest that, sequestering miR165/166 activity enhances seed germination efficiency under normal and ABA-stress condition.