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Genotypic variability of drought-tolerance responses in underutilized indigenous finger millet genotypes

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Abstract

Finger millet production was negatively affected by drought stress. Thus, the assessment of genotypic variability for drought tolerance is of great significance for the finger millet breeding program. A pot experiment was conducted to evaluate drought responses in 32 indigenous finger millets originated from various regions of Koraput along with five improved genotypes including drought tolerant check (GPU28). Variations of early morpho-physiological traits such as seedling length, fresh and dry biomass, dry matter accumulation (DMA), relative growth index (RGI), relative water content (RWC), drought tolerance index (DTI), SPAD index along with photosynthesis gas exchange parameters and PSII activity were evaluated under simulated drought stress by withholding irrigation. The first two axes of principal component analysis (PCA) captured 94.6% of the total variation of morpho-physiological traits and indicated wide variations among the genotypes. Among the studied traits, DTI, DMA, RWC, photosynthetic rate and leaf area are identified as the major determining factor for diversity among finger millet genotypes. These traits also recorded higher genetic heritability accompanied by high genetic advance, which may be of larger interest for crop improvement programmes. Based on drought tolerance ranking, six finger millet genotypes (Ladu, Lala, Bati, Biri, Tumuka and Bhalu) showed superior drought tolerance response compared to the tolerant check genotypes. These genotypes are identified as drought tolerant genotypes of this region suited for cultivation in drought prone areas and can be used in future finger millet breeding programs for drought tolerance.

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Acknowledgements

We highly acknowledged the Regional Director, MS Swaminathan Research Foundation, Jeypore, for supplying finger millet seeds for the experiment. Mr. Prafulla K. Behera and Mr. Suraj K. Padhy, PhD Scholars of CUO are thanked for their help during recording of physiological data.

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Authors and Affiliations

  1. Department of Biodiversity and Conservation of Natural Resources, Central University of Odisha, Koraput, Odisha, 763004, India

    Debabrata Panda, Aloukika Panda & Barsarani Bhoi

  2. MS Swaminathan Research Foundation, Jeypore, Koraput, Odisha, 764002, India

    Kartik C. Lenka

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  1. Debabrata Panda
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  2. Aloukika Panda
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  3. Barsarani Bhoi
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  4. Kartik C. Lenka
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Contributions

BB, AP and DP conceive and designed the experiments, AP, KL and BB growing the plants and measured the morpho-physiological traits. DP supervised the work, analysed the data and wrote the paper. All the authors given valuable suggestion and approved the final draft of manuscript.

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Correspondence to Debabrata Panda.

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Panda, D., Panda, A., Bhoi, B. et al. Genotypic variability of drought-tolerance responses in underutilized indigenous finger millet genotypes. Plant Physiol. Rep. 28, 362–377 (2023). https://doi.org/10.1007/s40502-023-00742-8

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