Relationship of sedling traits with drought tolerance in spring wheat cultivars
2000
Nagrajan, S. (Indian Agricultural Research Institute, Karnal (India). Regional Station) | Rane, J. (Directorate of Wheat Research, Karnal (India))
An attempt was made to quantify seedling traits of ten diverse genotypes in a sand culture experiment under five moisture regimes. Thirty days after seedling, germination percentage, coleoptile length, longest root length, leaf area, root dry weight, seedling dry weight and total root length were quantified. High genetic variability was observed at all moisture levels for root dry weights, seedling dry weight and total root length. A positive association was observed between these seedling values and known drought tolerance of the genotypes tested. The same genotypes were grown in a green house under well watered and water stressed conditions and the correlation between reduction in biomass or seed yield under stress with seedling raits was evaluated. The longest root length, root dry weight, seedling dry weight and total root length showed high correlation with per cent reduction in biomass and grain yield. Quantifying early vigour in terms of seedling characters accurately in sand culture can be used for early generation selection of drought tolerant lines.
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