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R. Paul Schreiner and Jungmin Lee

, 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

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Julián Miralles-Crespo, María J. Sánchez-Blanco, Alejandra Navarro G., Juan J. Martínez-Sánchez, Jose A. Franco L., and Sebastián Bañón A.

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

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B. Shaun Bushman, Lijun Wang, Xin Dai, Alpana Joshi, Joseph G. Robins, and Paul G. Johnson

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

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Ida Di Mola, Youssef Rouphael, Giuseppe Colla, Massimo Fagnano, Roberta Paradiso, and Mauro Mori

), 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

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R. Paul Schreiner

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

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T.J. Smalley, M.A. Dirr, A.M. Armitage, B.W. Wood, R.O. Teskey, and R.F. Severson

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

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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.”

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Andrew G. Reynolds, Amal Ehtaiwesh, and Christiane de Savigny

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

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Zheng Wang, Mark Williams, Krista Jacobsen, and Timothy Coolong

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

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S.M. Lutfor Rahman, Eiji Nawata, and Tetsuo Sakuratani

Effects of water stress at different plant ages on SOD activities were studied in two tomato cultivars. Water stress treatment decreased the leaf water potential in all stages, but reduction of leaf water potential was more rapid and pronounced in KF than TM at all DSLs (days of seedlings). After withdrawal of water stress treatment, stressed plants of TM increased leaf water potential to the values of control level in all DSLs, but in KF, leaf water potential of stressed plants were much lower than that of control plants. Effects of water stress on relative water content (RWC) of leaves at 20 DSL showed a similar tendency to that on leaf water potential. The SOD activities in both cultivars showed significant increase by water stress treatment at all DSLs, but the increase of SOD by water stress was larger in TM than in KF. This tendency was observed at all DSLs. The results may indicate that SOD activities play an important role in drought tolerance of tomato at various plant ages and suggest a possible use of SOD activities as a criterion for tomato drought tolerance.