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. This element also promotes cell turgidity by maintaining high leaf water potential, which in turn increases stomatal conductance and rates of photosynthesis under drought conditions ( Hassan and Sahrin, 2012 ). Rootstocks have been used for propagating
weight rank order (and to a lesser degree, yield) of five grape rootstocks over a wide range of midday leaf water potentials, induced using increasingly restrictive irrigation regimes ( Williams, 2010 ). This principle was also true for the rootstock
sativa ) nodules subjected to a moderate drought (leaf water potential of –1.3 MPa) ( Naya et al., 2007 ). Acid invertase is involved in sucrose hydrolysis. In contrast to SS, AI activity in this study was reduced under long-term deficit irrigation. These
.J. Malone, M. Jackson, M.B. 1995 A negative hydraulic message from oxygen-deficient roots of tomato plants? Influence of soil flooding on leaf water potential, leaf expansion, and synchrony between stomatal conductance and root hydraulic conductivity Plant
Lauderdale, D.M. Gilliam, C.H. Eakes, D.J. Keever, G. Chappelka, A. 1995 Tree transplant size influences post-transplant growth, gas exchange, and leaf water potential of ‘October Glory’ red maple J. Environ. Hort. 13 178 181 Meinzer, F.C. Johnson, D
) trees ( Kim et al., 2011 ), and holds promise for doing so in pecan. In grape ( Vitis vinifera ), the reflectance-based water index effectively tracked variation in leaf stomatal conductance ( R 2 = 0.81) at a predawn leaf water potential of −0.42 MPa
.A. Brown, J.H. Ferguson, H. 1989 Leaf water potential, relative water content, and diffusive resistance as screening techniques for drought resistance in barley Agron. J. 81 100 105 10.2134/agronj1989.00021962008100010018x Morsy, M.R. Jouve, L. Hausman, J
efficiency, and chlorophyll integrity, it also induces significant decreases in leaf water potential in kentucky bluegrass ( Abraham et al., 2004 ; Jiang and Huang, 2000 ). Similar effects of drought stress have been detected in other cool-season grasses
between Tr and VPD. The same was the case under both RDI S and the additional deficits. The hysteretic responses can be modulated by abiotic factors like soil water potentials and by biotic factors like leaf water potential, which are particularly
Abstract
Two field experiments were conducted to evaluate the effects of differential irrigation on plant growth, development, and water status of 2 snap bean cultivars, ‘Oregon 1604’ and ‘Galamor’ (Phaseolus vulgaris L.). Plants were grown at various irrigation levels ranging from a well-watered control to a dry treatment which received only one irrigation to establish plants. Measurements on plants sampled weekly at 6 times during the growing season showed that total plant dry weight, total leaf dry weight, total leaf area, average area per leaf, and number of leaves per plant were reduced by water deficits in both cultivars. Also, for both cultivars, total leaf area per plant was reduced more by a decrease in area per leaf than by a reduction in leaf number. Specific dry leaf weight was higher in the drier treatments. During each year, a significant difference between treatments occurred earlier in the season for total leaf area per plant than for total plant weight. At predawn, leaf water potential (ψ) always was more negative in the dry treatment than in the control. Early in the season, there was no significant difference in midday ψ between the control and dry treatment. Later, as soil water became limiting, the dry treatment had a more negative ψ than the control. Near the end of the season, after the dry treatment had been subjected to a long period of water stress, midday ψ was more negative in the control than in the dry treatment. Although some osmotic adjustment occurred in the dry treatment, leaf turgor potential (ψp) was generally lower than in the control throughout the day. As ψ decreased from early morning through midday, transpiration rates increased due to an increase in evaporative demand on the leaves. Leaf diffusive resistance also increased with decreasing ψ but a “threshold value” for stomatal closure was not demonstrated.