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 Jyothi Lakshmi, N., Vanaja, M., Yadav, S. K., Amol Patil, Ram Prasad, Ch., Sathish, P., Vijay Kumar, Vagheera, Salini K., and Maheswari, M. 2017. Genetic variability for grain yield and water use efficiency in blackgram genotypes. J. Appl. Nat. Sci. 9 (3): 1592- 97. T3-40P-1086 Variability in Growth and Yield Responses of Four Blackgram Genotypes at Elevated CO2 M.Vanaja*, P. Sathish, B. Sarkar, N. Jyothi Lakshmi, A. Sushma, Ch. Mohan, S.K. Yadav, M. Prabhakar and V.K. Singh Central Research Institute for Dryland Agriculture, Hyderabad 500059, Telangana, India * m.vanaja@icar.gov.in; vanajamaddi@gmail.com The earth atmospheric CO2 concentration continuously rising, and the current levels have reached 411 ppm (https://climate.nasa.gov/vital-signs/carbon-dioxi de/). The impact of elevated CO2 (eCO2) was positive with C3 crops especially legumes for both biomass and seed yield as compared to C 4 cereal crops. The eCO 2 brings about an increase in photosynthetic rates, growth, development, and yield of a wide range of cultivated crops (Pan et al., 2018). The productivity of most agricultural crops increases under eCO2 in the range of 15 to 41% for C3 crops and 5 to 10% for C4 crops (Kimball, 2011). For nutritional security, especially for the vegetarian population inclusion of pulses is essential. Blackgram (Vigna mungo L.) also called as urad is the ‘King of pulses’ and is considered as originated in India. It belongs to the Leguminosae family and in India, it is grown in 3.5 million hectares with a production of around 2.0 million tonnes. The present study was aimed at the quantification of the biomass and yield responses of this important pulse crop to eCO 2 and variability in genotypes with high yield potential. Methodology To assess the impact of eCO 2 on growth and yield of four blackgram (Vigna mungo L.) genotypes (IPU-06-02, PLU-826, PSRJ-95016 and IPU- 94-1), a field experiment was conducted in Open Top Chamber (OTC) facility during Kharif 2022. The OTC facility consists 6 chambers of 3m × 3m × 3m and two of them were maintained at ambient CO2 (aCO 2) and four at eCO2 of 550ppm (Vanaja et al., 2016). The observations were recorded on phenology of flowering, physiological, biomass and yield parameters. Results The phenology of 50% flowering was early under eCO2 condition by 2.0 (PLU-826) to 3.7 days (PSRJ-95016) as compared with ambient condition. The eCO 2 condition improved Net 421 | 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 Assimilation, Anet (17%) and water use efficiency, WUE (19%) and reduced the stomatal conductance, gs (24%), and transpiration, Tr (3%) of blackgram genotypes than at aCO 2. Among the four selected genotypes, IPU-06-02 registered highest response to eCO 2 for all these physiological parameters. The improvement of total biomass with eCO2 ranged from 22% (IPU- 94-1) to 30% (IPU-06-02) and seed yield from 27% (PSRJ-95016) to 45% (IPU- 94-1). The improved seed yield was mainly contributed by increased per plant pod number (24%), number of seeds (19%) and 100 seed weight (12%) indicating that the enhanced CO 2 concentration with improved assimilative capacity increasing pod set as well as seed filling. The presence of eCO2 improved both vegetative and reproductive biomass and impacted the proportion of enhanced biomass towards seed. It was observed that the overall impact of eCO 2 on this pulse crop was higher for reproductive biomass (32%) than vegetative biomass (22%) and this was reflected in improved harvest index, HI (3.6%). Similarly, Ziska and Blowsky (2007) also reported a significant increase in pod number, pod weight, and total seed weight at elevated CO2 concentration in mung beans. Improvement of physiological parameters in black gram with eCO2. Managing genetic resources for enhanced stress tolerance 422 | Page

Page 1 and 2: Extended Summaries 22-24 December,

Page 3 and 4: Citation Rama Rao, C.A., Srinivasa

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