Abstract
Seedlings of ‘Halford’ peach [Prunus persica (L.) Batsch] maintained in a growth chamber and exposed to leaf water deficits as low as – 38 bars exhibited slight osmotic adjustment before turgor potential reached zero. This adjustment was inadequate to maintain high turgor potential, which decreased until reaching zero at a total leaf water potential of ca. —20 bars. Stomatal conductance was linearly related to total leaf water potential and independent of the average turgor potential of the leaf.
, which may have influenced whole vine biomass and nutrient contents. Leaf water potential was determined from the same leaves used for gas exchange by placing the leaf in a plastic bag and cutting the petiole with a razor blade immediately after taking
Abbreviations: CK, cytokinins; LWP, leaf water potential. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate
R. alaternus and C. citrinus , respectively ( Fig. 5 ), values that can be considered reference values for shrubs without water stress ( De Herralde et al., 1998 ; Munné-Bosch et al., 1999 ). Fig. 5. Leaf water potential evolution for drought and
an error in the y-axis label for Figure 4, as follows: Instead of saying “Ratio wet to dry leaf water potential” the y-axis label should read: “Ratio dry to wet leaf water potential.”
d of treatment, PI 440603 had significantly higher ψLEAF than the other three entries ( Fig. 3 ). Fig. 3. Leaf water potential responses of four kentucky bluegrass entries under increasing salt treatments and for 28 d of treatment. Error bars
), instantaneous water use efficiency (WUE i ) and leaf water potential at midday (Ψ l ) of lettuce plants grown in the second growing year. Discussion The inhibition of the photosynthesizing leaf area, stunted growth, and yield reduction are general responses of
indicate shoot growth; fine root density to indicate root growth; AMF colonization of fine roots; midday leaf water potential (Ψ leaf ) and stomatal conductance ( g s ) as measures of plant water status; fruit yield; and berry quality attributes (soluble
increased yields of Geneva double curtain-trained ‘Concord’ by 13% as well as increasing berry and pruning weights. In New York, Liu et al. (1978) measured leaf water potential <−16 bars in field-grown ‘Concord’ vines; however, despite these conditions
seasons. Leaf water potential. Neither production system or tillage regime had an effect on Ψ L . However, midday Ψ L was significantly greater in water-restricted plants than in well-watered plants in both study years ( Fig. 2 ). Predawn Ψ L was