Use of infrared thermography imaging for assessing heat tolerance in high and low iron pearl millet lines

    Pushpavalli, R and Kanatti, A and Govindaraj, M (2020) Use of infrared thermography imaging for assessing heat tolerance in high and low iron pearl millet lines. Electronic Journal of Plant Breeding, 11 (02). pp. 627-632. ISSN 0975-928X

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    Abstract

    In the arid regions of Asia and Africa, pearl millet serves as a staple source of dietary energy and mineral micronutrients for millions of people. These regions are more vulnerable to increased temperature. The availability of rapid and efficient screening tools based on the relevant non-destructive quantifiable traits would facilitate pearl millet improvement for heat tolerance. The objective of this study was to evaluate pearl millet lines with contrast micronutrients for heat tolerance using infrared thermal imaging, a rapid proxy-canopy (panicle and flag leaf) temperature measurement. Results showed the highly significant genotypic differences between high-Fe and low-Fe genotypes for grain Fe and Zn densities and agronomic traits. Both high-Fe and low-Fe group genotypes differed significantly for panicle temperature depression (PTD) during high- vapor deficit (VPD) at stigma stage (3.0 to 6.73°C). PTD values were positive across all genotypes during stigma stage and were very low or negative during the low-VPD. Cooler canopy temperature (high-PTD) was observed during stigma stage rather than seed-set stage at higher-VPD in both high-Fe and low-Fe genotypes. The cooler temperature achieved by panicle might be helpful in maintaining stigma receptivity for longer periods in the female parents, whereas in male parents it might be helpful in maintaining pollen viability for longer periods. Flag leaf temperature (FTD) was cooler than PTD at both high-VPD and low-VPD as well in both stigma (less by 2.1°C) and grain-filling stage (less by 2.7°C), again signifying that the reproductive parts are more prone to heat stress as compared to vegetative parts. Since, thermal imaging discriminates the heat stress and non-stress canopies, this can serve as a proxy canopy temperature tool for heat stress tolerance screening in pearl millet.

    Item Type: Article
    Divisions: Research Program : Asia
    CRP: CGIAR Research Program on Agriculture for Nutrition and Health (A4NH)
    Uncontrolled Keywords: Infrared image, Heat tolerance, Iron, Zinc, Pearl millet
    Subjects: Mandate crops > Millets > Pearl Millet
    Others > Food and Nutrition
    Depositing User: Mr Arun S
    Date Deposited: 23 Aug 2020 15:06
    Last Modified: 23 Aug 2020 15:16
    URI: http://oar.icrisat.org/id/eprint/11566
    Official URL: https://doi.org/10.37992/2020.1102.102
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: This study was partially supported by HarvestPlus Challenge Program of the CGIAR, was conducted under CGIAR Research Program on Agriculture for Nutrition and Health (A4NH).
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