Browsing by Author "R. Beena"

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Chemical elicitors- a mitigation strategy for maximize crop yields under abiotic stress
(Elsevier, 2023) Ch L.N. Manikanta; P. Ratnakumar; R. Manasa; Brij B. Pandey; P.R. Vaikuntapu; Akankhya Guru; Arti Guhey; R. Beena; K. Ramesh; Yogeshwar Singh
Plants in their innate environment are challenged by several abiotic stresses viz., extremes of water and temperatures in general and in certain specified environments, salinity, heavy metal, and UV radiations either alone or in combination leading to crop yield penalty worldwide. Breeding approaches either through conventional or non-conventional have significantly contributed to the development of stress tolerant varieties, but not for unforeseen combination of multiple stresses. Therefore, there is a necessity to achieve long term protection to manage stresses. One such promising strategy is the application of low molecular weight chemical elicitors for tapping the innate potential of crops through activation of several defense-related genes and accumulation of phytoalexins. These chemical elicitors are either a natural or synthetic compounds known to act at very low concentrations as messenger molecules activating the signaling pathway via binding to the receptor molecules. This chapter is an attempt to provide an insight into the potential role, classification, and mode of action of the major chemical elicitors as a mitigating strategy against abiotic stress for sustainable yields. © 2023 Elsevier Inc. All rights reserved.
QTL-Meta-analysis and Candidate Gene(s) for Anaerobic Germination Potential in Rice
(Springer, 2025) Sanchika Snehi; Pawan Kumar Singh; R. Beena; Suneetha Kota; Satish Kumar Sanwal; Kajal T.Ravi Kiran; Chandrappa Anilkumar; Krishnendu Chattopadhyay; Nitish Ranjan Prakash; Rameswar Prasad Sah
Anaerobic germination (also known as germination stage oxygen deficiency) tolerance is an important trait for tailoring direct-seeded rice varieties. In the present study, a meta-analysis of QTLs governing anaerobic germination we identified 21 Meta-QTLs with < 1 cM (~ 250 kb) confidence interval, 10 with 1–4 cM (~ 250–1000 kb), and 15 with > 4 cM (> 1000 kb). Gene ontology (GO) analysis identified trehalose biosynthetic process (GO: 0005992), negative regulation of translation (GO: 0017148), protein and amino acid phosphorylation (GO: 0006468), cation transport activity (GO: 0006812), ATP binding (GO: 0005524), inorganic cation transmembrane transporter activity (GO: 0022890), protein serine/threonine kinase activity (GO: 0004674), rRNA N-glycosylase activity (GO: 0030598), and nucleoside-triphosphatase activity (GO: 0017111) as significant. We identified 56 differentially expressed genes (21 Meta-QTLs) and designated 13 candidates based on molecular functions and gene ontology. Genes Os02g0304900, Os01g0568400, and Os01g0566500 encode proteins in abscisic acid (ABA) metabolism and signaling pathway which is essential in signaling-, response-, and management of hypoxic stress during anaerobic germination. Another candidate Auxin-responsive SAUR protein influences the auxin distribution within tissues to regulate the coleoptile elongation, possibly in coordination with another gene OsNAC024 maintaining ROS activity in anaerobic germination response. Other probable genes act as a positive regulator of amylase (Os03g0665200), enhance proline content, lower hydrogen peroxide levels, and increase antioxidant enzyme activities (Os01g0568400), lipid transfer, metabolism, and storage (Os04g0554800; Os08g0131300), and in sugar signaling. These candidates can be validated in independent populations and targeted for haplotype-based genomic and marker-assisted breeding for direct-seeded rice. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.