SRAVANTHI G., DHEERAVATHU S. N.*, LATHA P. AVINASH S., JACOB J., VIJAYA KUMAR G. AND VADITHE T. B.
Indian Institute of Millets Research, Hyderabad- 500030, (Telangana), India
Department of Crop Physiology, Agricultural College, Bapatla (ANGRAU) (Andhra Pradesh), India
Department of Crop Physiology, RARS, Tirupati, (Andhra Pradesh), India
*(e-mail: sevanayak2005@gmail.com)
(Received: 2 September 2024; Accepted: 26 September 2024)
SUMMARY
Heat stress is one of the major abiotic stresses that adversely affect morpho-physological and growth yield traits. In the present investigation, fifty sorghum accessions were tested for high temperature stress tolerance at seedling stage. Shoot length, shoot, and root fresh weight, shoot, root dry weight and, total shoot and root water content were significantly (p<0.001) affected by high temperature stress. The maximum root to shoot ratio was observed in five accessions viz., ECO533402(1.8), ICO319906 (1.5), ICO333362 (1.4), ICO332479 (1.4) and ICO333372 (1.4). Highest total shoot and root fresh weight was recorded in ICO305901(89g; 85g), ICO333356 (84g; 88g) and ICO305887 (83g; 82g) accessions. Among the fifty accessions, five (ICO305910, ICO305903, ICO305887, ECO533402 and ICO305887) accessions were found to exhibit heat stress tolerance compared to other accessions at high temperature (35°C). Positive significant correlation was found between root to shoot ratio (p<0.001).
Key words: Heat stress, sorghum, root to shoot ratio, total shoot water content, total root water content