Cell wall elasticity and Water Index (R970 nm/R900 nm) in wheat under different nitrogen availabilities

Abstract New data showing the importance of cell wall elasticity in the expression of the Water Index (WI) (R970/R900) as an indicator of plant water status are presented. We studied wheat under five different nitrogen (N) fertilization treatments (0 to 200kg ha-1) to test N-availability effects on tissue structural changes such as cell wall composition and elasticity, and the corresponding effects on WI. Although water was amply supplied in all the plots, Wl, CWSI (Crop Water Stress Index) and ST (canopy minus air temperature) were all highest in the N-0 (no fertilization) treatment. Plants in this treatment had the most xeromorphic characteristics. Their specific leaf weight (SLAV) and leaf cellulose contents were higher and their cell wall elasticities were lower than in the other N treatments. WI was a useful water status indicator (even of mild water stress conditions) at ground level when elasticity was low, WI may also become an indicator of cell wall elasticity of leaves when plant water status is...

[1]  J. Peñuelas,et al.  The red edge position and shape as indicators of plant chlorophyll content, biomass and hydric status. , 1994 .

[2]  Christopher B. Field,et al.  Reflectance indices associated with physiological changes in nitrogen- and water-limited sunflower leaves☆ , 1994 .

[3]  J. Peñuelas,et al.  Changes in leaf osmotic and elastic properties and canopy structure of strawberries under mild water stress , 1993 .

[4]  Tsuyoshi Akiyama,et al.  Canopy water deficit detection in paddy rice using a high resolution field spectroradiometer , 1993 .

[5]  J. Peñuelas,et al.  The reflectance at the 950–970 nm region as an indicator of plant water status , 1993 .

[6]  Josep Peñuelas,et al.  Remotely measured canopy temperature of greenhouse strawberries as indicator of water status and yield under mild and very mild water stress conditions , 1992 .

[7]  Warren B. Cohen,et al.  Temporal versus spatial variation in leaf reflectance under changing water stress conditions , 1991 .

[8]  C. R. Bull,et al.  Wavelength selection for near-infrared reflectance moisture meters , 1991 .

[9]  William D. Bowman,et al.  The relationship between leaf water status, gas exchange, and spectral reflectance in cotton leaves , 1989 .

[10]  R. Reginato,et al.  Winter wheat response to water and nitrogen in the North American Great Plains , 1988 .

[11]  J. Morgan.  Interaction of water supply and N in wheat. , 1984, Plant physiology.

[12]  G. C. Green,et al.  Evaluation of the infrared thermometer as a crop stress detector , 1984 .

[13]  R. D. Jackson,et al.  Directional reflectance factor distributions of a cotton row crop , 1984 .

[14]  B. Holben,et al.  Leaf water stress detection utilizing thematic mapper bands 3, 4 and 5 in soybean plants , 1983 .

[15]  F. Stuart Chapin,et al.  Carbon/nutrient balance of boreal plants in relation to vertebrate herbivory , 1983 .

[16]  J. Boyer.  Plant Productivity and Environment , 1982, Science.

[17]  M. Tyree,et al.  Alternate methods of analysing water potential isotherms:some cautions and clarifications.II.Curvilinearity in water potential isotherms , 1982 .

[18]  M. Tyree,et al.  Alternative Methods of Analysing Water Potential Isotherms: Some Cautions and Clarifications I. THE IMPACT OF NON-IDEALITY AND OF SOME EXPERIMENTAL ERRORS , 1981 .

[19]  Melvin T. Tyree,et al.  The Measurement of the Turgor Pressure and the Water Relations of Plants by the Pressure-bomb Technique , 1972 .

[20]  K Raschke,et al.  Heat Transfer Between the Plant and the Environment , 1960 .

[21]  C. Olivella,et al.  Seasonal patterns of water relationships, photosynthetic pigments and morphology of Actinidia deliciosa plants of the Hayward and Tomuri cultivars , 1994 .

[22]  Steven W. Running,et al.  Detection of canopy water stress in conifers using the airborne imaging spectrometer , 1991 .

[23]  R. Jackson.  Remote sensing of biotic and abiotic plant stress , 1986 .

[24]  J. Morgan.  The Effects of N Nutrition on the Water Relations and Gas Exchange Characteristics of Wheat (Triticum aestivum L.). , 1986, Plant physiology.

[25]  R. D. Jackson,et al.  Spectral response of cotton to suddenly induced water stress , 1985 .

[26]  Park S. Nobel,et al.  Biophysical plant physiology and ecology , 1983 .

[27]  R. Jackson.  Canopy Temperature and Crop Water Stress , 1982 .

[28]  J. Radin.  Water Relations of Cotton Plants under Nitrogen Deficiency: III. STOMATAL CONDUCTANCE, PHOTOSYNTHESIS, AND ABSCISIC ACID ACCUMULATION DURING DROUGHT. , 1981, Plant physiology.