The Relationship between Leaf Water Potential and Stem Diameter in Sorghum

2001 ◽  
Vol 93 (6) ◽  
pp. 1341-1343 ◽  
Author(s):  
Kamal G. Yatapanage ◽  
Hwat Bing So
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Water ◽  
Stem Diameter ◽  
The Relationship

scholarly journals Chlorophyll fluorescence varies more across seasons than leaf water potential in drought-prone plants

2016 ◽  
Vol 88 (suppl 1) ◽  
pp. 549-563 ◽  
Author(s):  
BRUNO H.P. ROSADO ◽  
EDUARDO A. DE MATTOS
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Water Availability ◽  
Leaf Water ◽  
Tropical Species ◽  
Tropical Plants ◽  
Tropical Vegetation ◽  
Leaf Succulence ◽  
The Relationship

ABSTRACT Among the effects of environmental change, the intensification of drought events is noteworthy, and tropical vegetation is predicted to be highly vulnerable to it. However, it is not clear how tropical plants in drought-prone habitats will respond to this change. In a coastal sandy plain environment, we evaluated the response of six plant species to water deficits across seasons, the relationship between their morpho-physiological traits, and which traits would be the best descriptors of plants' response to drought. Regardless of leaf succulence and phenology, responses between seasons were most strongly related to chlorophyll fluorescence. In this study we have demonstrated that a better comprehension of how tropical species from drought-prone habitats cope with changes in water availability can be based on seasonal variation in leaf water potential and chlorophyll fluorescence. Temporal variation in leaf water potential and chlorophyll fluorescence was found useful for differentiating between groups of sandy soil species that are responsive or unresponsive to water availability. However, chlorophyll fluorescence appeared to be a more sensitive descriptor of their seasonal and short-term responses.

The relationship between steady-state transpiration rates and leaf water potential in cassava (Manihot esculenta cv. Llanera)

1978 ◽  
Vol 56 (13) ◽  
pp. 1537-1539 ◽  
Author(s):  
I. F. Ike ◽  
G. W. Thurtell ◽  
K. R. Stevenson
Keyword(s):  
Steady State ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Manihot Esculenta ◽  
Regression Line ◽  
Leaf Water ◽  
Dew Point ◽  
Manihot Esculenta Crantz ◽  
The Relationship

The relationship between leaf water potential (ψL) and transpiration rate (T) was investigated using indoor-grown cassava plants (Manihot esculenta Crantz cv. Llanera). Leaf water potentials were measured with in situ dew-point hygrometer and transpiration rates by gas exchange analysis technique.Regression analyses of the data showed that T was consistently linearly related to ψL (r2 = 0.94). This implies that the plant resistance to flow was constant and hence that an Ohm's Law analog is valid for the transpiration range studied. Extrapolated values of leaf water potential at zero transpiration were close to the osmotic potential of the nutrient solution. Calculated resistance values (slope of regression line for individual plants) varied between 2.90 and 3.05 bars dm2 h g−1 (1 bar = 100 kPa).

Water Relations of the Mistletoe, Amyema miquelii, and Its Host Eucalyptus fasciculosa

1988 ◽  
Vol 36 (3) ◽  
pp. 239 ◽  
Author(s):  
J Whittington ◽  
R Sinclair
Keyword(s):  
Water Potential ◽  
Water Flow ◽  
Water Relations ◽  
Leaf Water Potential ◽  
Transpiration Rate ◽  
Water Status ◽  
Leaf Water ◽  
Tissue Water ◽  
The Relationship ◽  
Seasonal Data

Mistletoes have frequently been found to transpire more rapidly than their hosts, and usually maintain a more negative water potential. Leaf water potential and diffusive conductance were monitored from the end of a dry summer (March) through a wet winter (to August) on the mistletoe Amyema miquelii (Lehm. ex Miq.) Tieghem and its host Eucalyptus fasciculosa F. Muell. The calculated transpiration rate of the mistletoe was greater than that of its host, but water potential data showed two unusual features. Firstly, the parasite pre-dawn water potential always remained lower than that of the host, regardless of the host's water status. Secondly, the parasite water potential during the day was on one occasion less negative than that of the host, i.e. a reverse gradient. Tissue water relations studies showed that A. miquelii leaves had more negative solute potential and a larger water capacitance than E. fasciculosa leaves. The unusual features of the seasonal data were explained in terms of a large haustorial resistance to water flow and hysteresis in the relationship between transpiration and water potential in the mistletoe leaf. This hysteresis was thought to be due to the contribution of stored leaf water to transpiration.

Soil water reserve estimation and vegetation relationships in a Mediterranean sub-humid forested catchment

2012 ◽  
Vol 43 (3) ◽  
pp. 167-178 ◽  
Author(s):  
J. Martínez-Fernández ◽  
V. Hernández-Santana
Keyword(s):  
Water Potential ◽  
Water Content ◽  
Soil Water ◽  
Leaf Water Potential ◽  
Leaf Water ◽  
Balance Model ◽  
Forested Catchment ◽  
Water Reserve ◽  
Stem Water ◽  
The Relationship

A simple water balance model was used to calculate soil water reserve in a Mediterranean forested catchment. The relationship between soil water reserve and leaf water potential and stem water content was analysed. The usefulness of these variables as plant water status indicators was tested. The analyses were developed with a seven-year-long database (2001–2007) in the case of soil water content and with a four-year long one (2004–2007) for the tree variables. The soil water reserve showed similar types of behaviour for every year, with minimum values at the end of summer (75.2 mm in September 2003) and maxima in winter (204.7 mm in January 2001). The balance model built with precipitation, runoff and ETo simulated the soil moisture content well (r2 = 0.85, p < 0.001). Seasonal variations in the tree variables followed a typical trend, maximum values (−0.18 MPa in June 2007 and 0.654 cm3 cm−3 in May 2004, respectively) being observed at the end of spring, and minimums due to summer drought (−1.5 MPa and 0.520 cm3 cm−3 in August 2005). The relationship was stronger between soil water reserve and stem water content (r2 = 0.85) than with leaf water potential (r2 = 0.67), suggesting stem water content is a more sensitive indicator of water limitation.

scholarly journals Growth evaluation and water relations of Erythrina velutina seedlings in response to drought stress

2010 ◽  
Vol 22 (4) ◽  
pp. 225-233 ◽  
Author(s):  
Elizamar Ciríaco da Silva ◽  
Marcos F. A. Silva ◽  
Rejane J. M. C. Nogueira ◽  
Manoel B. Albuquerque
Keyword(s):  
Water Potential ◽  
Leaf Area ◽  
Plant Height ◽  
Water Relations ◽  
Leaf Water Potential ◽  
Dry Matter ◽  
Leaf Water ◽  
Stem Diameter ◽  
Root:Shoot Ratio ◽  
Number Of Leaves

Erythrina velutina Willd. (common name: mulungu) is a deciduous, heliophyte found in the semi-arid region of northeastern Brazil. To evaluate the growth and water relations of mulungu seedlings in soils with different degrees of moisture content, an experiment was carried out under greenhouse conditions using four water treatments (100%, 75%, 50% and 25% of the field capacity- FC). Predawn (Ψpdw) and midday leaf water potential (Ψmdw), relative water content (RWC), plant height, number of leaves, stem diameter, leaf area (LA), specific leaf area (SLA), leaf area ratio (LAR), dry matter in different organs, biomass partitioning and root:shoot ratio were evaluated. No differences were detected between treatments for Ψpdw after 30 days; however, at midday, control plants and those under 75% FC underwent a greater reduction in Ψmdw than plants cultivated with 50% and 25% FC. After 90 days, only the plants under 50% FC exhibited a reduction in Ψmdw. RWC was reduced at midday, but there were no differences between treatments. Nearly all growth parameters were reduced due to water deficit, especially in the plants with 25% FC, as determined by the number of leaves, stem diameter, plant height, LA, SLA and dry mass in several organs. LAR and root:shoot ratio were not affected. Mulungu seedlings seem to have developed rusticity to overcome intermittent droughts with no change in the pattern of dry matter distribution. The maintenance of turgor pressure seems to be more associated to a reduction in the growth ratio than a reduction in leaf water potential.

Changes in Diffusive Conductance and Water Potential of Wheat Plants Before and After Anthesis

1977 ◽  
Vol 4 (1) ◽  
pp. 75 ◽  
Author(s):  
JM Morgan
Keyword(s):  
Water Potential ◽  
Water Deficit ◽  
Leaf Water Potential ◽  
Leaf Water ◽  
Wide Range ◽  
Before And After ◽  
Relative Water ◽  
Complete Failure ◽  
Two Phases ◽  
The Relationship

The relationships between stomatal conductance and leaf water potential, ΨL, of wheat plants during drying under controlled conditions showed three phases: (1) no apparent effect until ΨL reached about - 1.8 J g-1; (2) increasing closure as ΨL decreased to about - 3 J g-1; and (3) complete failure to open at lower ΨL values. At any given water potential in the first two phases, the stomata were always more open during the post-anthesis stage than during the pre-anthesis stage. Although the relationship between leaf water potential and relative water content differed with growth stage, this was not important in the overall plant response to a water deficit. Over a wide range of ΨL, the conductance of the adaxial surface was less variable and more sensitive than that of the abaxial surface. The ratio of these conductances was very variable and followed no discernible pattern. The water potential of spikelets was appreciably higher than that of flag leaves, especially at low values of the latter. Both organs died at about the same water potential (about -4 J g-1); hence, spikelets survived longer periods of water deficit than leaves. These responses are discussed in respect of sensitivity of grain yield to the stage of growth at which a water deficit is experienced and to the phenomenon of spikelet death. Differences between three cultivars examined were small.

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