Publications of NIPGR Scientists

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Author: search.filters.author.Giri, JitenderSubject: search.filters.subject.Lipidomics

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    Phosphate deficiency response and membrane lipid remodeling in plants
    (Springer Nature Publishing AG, 2021) Verma, Lokesh; Rumi; Sinha, Alok Krishna; Giri, Jitender
    Phosphorus (P) deficiency represents one of the significant constraints affecting plants growth and development. Plants have evolved with various adaptations to maximise the uptake of soil P and its distribution in the different organs. Membrane phospholipids store a significant amount of P as the cellular resource that is remobilised under the P deficiency condition. To utilise this P resource, plants initiate membrane lipid remodeling in which metabolic pathways are activated to allow Pi extraction from the phospholipids and reduce the P demand by increasing the synthesis of P-free lipids for replacing the phospholipids in the membrane. Many organisms, including non-photosynthetic/photosynthetic bacterium to plants employ this adaptation to survive under P deficiency conditions. The candidate genes and encoded enzymes seem to be broadly conserved among the different organisms; however, there are variations in a spatiotemporal manner. Here, we discuss the molecular mechanisms of membrane lipid remodelling and its regulation crucial for plants adaption to Pi deficiency.
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    Specific galactolipids species correlate with rice genotypic variability for phosphate utilization efficiency
    (Elsevier B.V., 2021) Verma, Lokesh; Kohli, Pawandeep Singh; Maurya, Kanika; K B, Abhijith; Thakur, Jitendra K.; Giri, Jitender
    Membrane lipid remodeling helps in the efficient utilization of phosphorus (P) by replacing phospholipids with galactolipids during P deficiency. Previous studies have shown lipid remodeling in rice under P deficiency; however, main lipid classes did not show association with superior P-use-efficiency in rice genotypes. Here, diverse rice genotypes were extensively phenotyped in normal (NP) and low P (LP) conditions. Based on the phenotypic response to P deficiency, genotypes were identified as tolerant and sensitive. Further, bulks were generated differing in their physiological P-use-efficiency (PPUE) during LP condition. Shoot lipidome profiling of genotypes was performed and used to correlate the abundance of various lipid classes and their constituent species with the PPUE of the genotypes. Lipid remodeling was observed as a P-starvation-induced response in all the genotypes. However, neither total galacto- and phospholipids nor the lipid classes correlated with PPUE during P deficiency. However, the difference in PPUE in the two bulks correlated with specific lipid species of galactolipids (DGDG, MGDG). Further, DGDG34:3 had the highest Mol% among the differentially accumulated lipid species between the two bulks. Our study reveals the importance of specific galactolipids species in rice adaptation to P deficient soils and thus opens new targets for future research.