Correlation for various traits in wheat under heat stress

The study was carried out to evaluate set of 20 genotypes along with four checks for heat stress conditions. The experiment was carried out in randomized block design with two replications under timely (17th Nov) and late sown (19th Dec) conditions at Wheat Research Unit, Dr. PDKV Akola during rabi 2023-24. The data was recorded for the characters viz., days to heading, days to maturity, plant height at harvest (cm), leaf area (dm2), canopy temperature (°C), chlorophyll content (SPAD), protein %, 1000 grain weight (g), grain yield per plot (kg) and biological yield (kg). These characters are recorded and correlated with yield. Results revealed that heat stress conditions induced by late sowing affected various traits, causing reduction in days to heading (4.94 days), days to maturity (5.21 days), plant height at harvest (2.27%), leaf area at 75 Days after sowing(DAS) (23.9%), chlorophyll content at 75 DAS (8.7%), 1000 grain weight (6.4%), grain yield per plot (7.18%), biological yield (10.7%) and there was an increase in protein content (3.4%) and canopy temperature (7.20%). Correlation studies showed significant positive correlation for leaf area, protein content, chlorophyll content, 1000 grain weight, biological yield and significantly negative correlation for canopy temperature and days to maturity with grain yield.