Book of Extended summaries ISDA

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
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