Phenotyping for stem reserve mobilization efficiency under heat, drought and combined stress along with defoliation in wheat (Triticum aestivum)

GURUMURTHY S; AJAY ARORA; BASUDEB SARKAR; HARIKRISHNA HARIKRISHNA; V P SINGH; RAJBIR YADAV; V CHINNUSAMY

doi:10.56093/ijas.v89i5.89643

Authors

GURUMURTHY S Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
AJAY ARORA Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
BASUDEB SARKAR Principal Scientist, ICAR-CRIDA, Hyderabad
HARIKRISHNA HARIKRISHNA Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V P SINGH Emeritus Scientist, ICAR-IARI
RAJBIR YADAV Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V CHINNUSAMY Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India

https://doi.org/10.56093/ijas.v89i5.89643

Keywords:

Combined stress, Defoliation, Drought stress, Heat stress, Stem reserve mobilization efficiency

Abstract

The present study was conducted to determine genotypic variations for stem reserve mobilization efficiency in wheat (Triticum aestivum L.) under drought, heat and combined stresses along with defoliation. Genotypes (43) were evaluated under 4 field conditions namely, timely sown irrigated (control), timely sown rainfed (drought), delayed sown irrigated (heat) and delayed sown rainfed (combined heat and drought) by cutting off all leaf blades (defoliation) at 12 days after anthesis. The traits recorded were stem reserve mobilization efficiency (SRE), harvest index (HI), grain weight (GW) and specific weight (Sp. wt). In timely sown and delayed sown environment condition the average maximum temperature was 24.7Â°C and 30.4Â°C during flowering to maturity stage respectively. The average soil moisture under control, drought, heat and combined stress was 14.46, 6.68, 16.87 and 7.78% respectively. SRE was found significantly higher under drought stress followed by combined stress, control and heat stress. The correlation analysis revealed Sp.wt at 12 DAA was highly positively correlated with the GW. The trait SRE was highly positively correlated with HI. Combined analysis for all stresses showed that HD 4728, Duram 1, Chiriya 3, HD 2851, HD 2329, DBW 43 had highest and Hindi 62, WL 711, GCP 23, HD 2967, GCP 2, Kalyansona had lowest SRE. Genotypes were also grouped into different clusters based on their SRE. The genotypes with higher SRE can be used in breeding programmes or directly used as cultivars under drought, heat and combined stress conditions.

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