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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #410666
Research Project: Characterization and Introgression of Nematode Resistance into Upland Cotton

Location: Crop Genetics Research

Title: Impact of high night temperature on soybean physiology and yield parameters

Author
item SANKARAPILLAI, LEKSHMY - Mississippi State University
item ADHIKARI, BIKASH - Mississippi State University
item Stetina, Salliana - Sally
item REDDY, K. RAJA - Mississippi State University
item BHEEMANAHALLI, RAJU - Mississippi State University

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/1/2024
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Multiple independent reports and climate models indicate that minimum night-time temperatures are rising faster than maximum day-time temperatures both globally and regionally. This phenomenon significantly contributes to global warming and reduces the temperature gap between day and night. This can have a profound impact on soybean growth and development. However, our current understanding of the effects of high night temperatures (HNT) on soybean physiology, yield, and quality-related parameters is limited. Thus, the primary objective of this study was to investigate the physiological and agronomic responses of commercially available soybean cultivars to HNT during the reproductive stage. Seventeen soybean cultivars grown under normal growing conditions were exposed to control (24°C) and HNT (28°C) with a common daytime temperature of 32°C from R2 till physiological maturity. Plants exposed to +4 oC warmer night showed a significant decrease (79%) in stomatal conductance and transpiration rate (67%) due to the increase in canopy temperature. Moreover, cultivars exposed to HNT stress exhibited a 37% increase in the respiration rate compared to the control. Among all cultivars tested, the cultivar S49-F5X had the least increase in respiration and had a comparable photosynthetic rate on the following day compared to the control. Furthermore, seed yield and quality trade-offs in response to HNT will be discussed. These findings offer valuable insights into the physiological impact of HNT at the cultivar level.