
%0 Journal Article
%A Fischer, RA 
%A Sanchez, M 
%T Drought resistance in spring wheat cultivars. II.* Effects on plant water relations
%J Australian Journal of Agricultural Research
%D 1979/10/01
%V 30
%N 5
%P 801-814
%K 
%R https://doi.org/10.1071/AR9790801
%U https://www.publish.csiro.au/paper/AR9790801 
%X We studied cultivar and drought effects on the water relations of a large set of cultivars of bread wheat (Triticum aestivum L.), durum wheat (T. turgidum), triticale (X Tritosecale Wittmack) and barley (Hordeum vulgare L.), grown in field plots in north-western Mexico in the presence and absence of simulated late drought. Leaf water potential (&Psi;) and osmotic potential (&pi;), and leaf permeability (LP) to viscous air flow were measured between 1000 and 1600 hours on many dates; leaf turgor potential (p) was calculated. Drought caused associated reductions in &Psi;, &pi; and LP. Cultivar effects on these variables were usually significant on given dates, and reasonably consistent between dates and drought intensities in the case of &Psi;, but less so for &pi; and LP. There were consistent positive phenotypic correlations between &Psi; and LP, and &Psi; and anthesis date, and a negative correlation between &Psi; and stature in the absence of drought. The relationship of LP to &Psi; for different cultivars differed significantly: in particular, tall bread wheats had lower LP than dwarf cultivars at high values of &Psi;, whereas at low &Psi; they had higher LP than the dwarf cultivars. There was general osmotic adjustment, and a tendency for the relationship of p to &Psi; to vary between cultivars. Irrespective of statistical significance, the effects of cultivar were generally small relative to those of drought intensity. 
