Book of Extended summaries ISDA

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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad to the efficient functioning of the cell organelle which is reciprocated in the relationship of the membrane injury index with the physiological and yield attributes. The membrane injury index has shown to have a strong negative relationship with the relative water content (-0.97), total chlorophyll content (-0.98), grain yield (-0.98) and the number of grains per plant (-0.98). The sorghum genotypes capable of avoiding damages to the membranes are more capable of producing photo-assimilates and reducing water losses from the leaf tissues in-turn resulting in better yields. Figure 2 describes the relationships of the root parameters such as root length, root volume, root diameter and root biomass. The grain yield has shown a positive relationship with the root length (0.69), root volume (0.78), root biomass (0.89 for root fresh weight and 0.71 for root dry weight). The longer roots are capable of absorbing water from the deeper layers of soil regime when they face reduced availability of moisture in the upper layers. The large volume and greater biomass represent the superior establishment of the roots aiding the sorghum plants to better absorb the water and nutrients from the soil. The negative association of the root diameter with the grain yield (-0.41) is because the spreading of roots in the upper layers of the soil regime is not beneficial to plant growth. 407 | Page Managing genetic resources for enhanced stress tolerance

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Conclusion Yield is a variable dependent on the crucial physiological and root parameters for efficient production of photoassimilates and their partitioning. References Barrs, H.D and Weatherly, P.E. 1962. A re-examination of relative turgidity for estimating water deficits in leaves. Aus. J. Bio. Sci., 413-428. Barnes, J.D., Blaguer, L., Manrique, E., Elvira, S and Davison,,A.W. 1992. A reappraisal of the use of DMSO for the extraction and determination of chlorophyll a and chlorophyll b in lichens and higher plants. Env. Exp. Bot., 32:85-100 Kocheva, K., Lambrev, P., Georgiev, G., Goltsev, V. and Karabaliev, M. 2004. Evaluation of chlorophyll fluorescence and membrane injury index in the leaves of barley cultivars under osmotic stress. 63: 121-124. Managing genetic resources for enhanced stress tolerance 408 | Page

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