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Morpho-physiological Responses of Finger Millet Genotypes to PEG-Induced Osmotic Stress at an Early Seedling Stage

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Abstract

The present study reports the effect of polyethylene glycol (PEG) (0–25%) induced osmotic stress on morpho-physiological responses of finger millet Eleusine coracana (L.) Gaertn] genotypes at an early seedling stage. The significant differences in morpho-physiological responses were observed at 25% PEG over control, 15–20% PEG concentration. At 25% concentration, finger millet genotypes were classified into three groups according to their F values. The first group contains seven sensitive genotypes GE 811, GPU 28, MS 9272, AMM 679, GE 4962, BM and PR 4617, with contribution from germination percentage, germination rate, root length, seed vigor index and tissue water content. The second group contains nine tolerant genotypes AMM 197, GE 4434, GE 496, GE 1013, GE 1332, GE 4764, GPU 67, PR 202, RAU 8 with contribution from fresh weight, dry weight, root: shoot ratio, chl a, chl b, total chlorophyll, and CSI. The third group consists of two semi-sensitive genotypes, PR 6038 and KEP 534 contributed by root length and seedling length. This study provides a rapid and reliable method for screening finger millet genotypes using germination, morpho-physiological parameters, and multivariate analysis to support future breeding programs.

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Acknowledgements

The financial support for this research was provided by the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India, New Delhi, India, in the framework of the Extramural Research Scheme [EMR/2015/000145]. In addition, MLN expresses thanks to the National Fellowship for Scheduled Tribes (NFST) for awarding the fellowship. The authors also thank Dr. H.D. Upadhyaya, ICRISAT, Patancheruvu, Hyderabad, India and Dr. Prabhakar, Former Project Coordinator, AICRP on Small Millets, University of Agricultural Sciences, GKVK, Bangalore, India, for providing seeds of different genotypes of finger millet.

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Significance statement: This study provides a rapid and reliable PEG-induced osmotic stress method for screening finger millet genotypes in future breeding programs.

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Mude, L.N., Mondam, M., Gujjula, V. et al. Morpho-physiological Responses of Finger Millet Genotypes to PEG-Induced Osmotic Stress at an Early Seedling Stage. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 93, 337–350 (2023). https://doi.org/10.1007/s40011-022-01421-8

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