Resumo

SILVA-ROBLEDO, Herman; ORTIZ-LIZANA, Mauricio  e  ACEVEDO-HINOJOSA, Edmundo. Hydric relationships and osmotic adjustment in wheat. Agrociencia [online]. 2007, vol.41, n.1, pp.23-34. ISSN 2521-9766.

With the aim of comparing the effect of two environments on hydric relationships, an analysis was made of the variation of osmotic adjustment and its relationship with yield in 20 wheat genotypes in the greenhouse and the field. It is postulated that osmotic adjustment (OA), measured in leaves of plants grown in the greenhouse, is an indicator of the OA in leaves of plants established in the field. The plants were established in pots in the greenhouse; one group was watered at field capacity (FC) and the other at 40% FC. In the field the plants were established in two assays: one with and the other without irrigation. The variables were: total water potential (Ψ), osmotic potential (ψs), water potential at maximum turgor (ψsh) and pressure potential (ψp). In the greenhouse, the osmotic adjustment value was lower (0.00 and 0.50 MPa), compared with the field values (0.01 to 0.7 MPa). There was high interaction irrigation×sampling, replication×sampling and irrigation×genotype in the field, but not in the greenhouse. In the field there was positive correlation between OA and yield (R2=0.31; p≤0.05), but the OA measured in the greenhouse was not correlated with the OA measured in the field.

Palavras-chave : Triticum aestivum L.; water stress; grain yield.

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