Indian Journal of Agricultural Research

  • Chief EditorV. Geethalakshmi

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Indian Journal of Agricultural Research, volume 43 issue 3 (september 2009) : 211-214

AGRO-PHYSIOLOGICAL TRAITS FOR SCREENING HEAT TOLERANT LINES OF WHEAT (Triticum aestivum L.) UNDER LATE SOWN CONDITIONS

D. S. Gill
1Department of Botany Punjab Agricultural University, Ludhiana-141001, India

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Cite article:- Gill S. D. (2025). AGRO-PHYSIOLOGICAL TRAITS FOR SCREENING HEAT TOLERANT LINES OF WHEAT (Triticum aestivum L.) UNDER LATE SOWN CONDITIONS. Indian Journal of Agricultural Research. 43(3): 211-214. doi: .

ABSTRACT

A field experiment was conducted during rabi (winter) season. Five wheat cultivars
(PBW-343, WH-542, PBW-502, PBW-509 and Raj-3765) sown on six dates of sowing
starting from 31st October at weekly interval upto 5th December to find out suitable
thermotolerance traits and genotypes. Amongst eleven traits recorded at different
growth stages, largest variability was observed in crop growth rate (CGR), partitioning
to spike, grain spike weight ratio (GSWR), spike growth duration (SGD), cumulative
growing degree days (GDD) accumulated during vegetative and reproductive
phenophases and grain yield at maturity. The highest grain yield was correlated with
longer spike growth duration, partitioning higher crop growth rate and grain spike
weight ratio at anthesis phase. The results revealed that cumulative growing degreedays
(GDD) accumulated more during the reproductive phases as compared with
the vegetative phases of wheat cultivars. The GDD is the effective selection criteria
for screening thermotolerant lines of wheat.

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