1965
DOI: 10.1111/j.1469-8137.1965.tb07550.x
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Controlled Environment Studies of the Nature and Origins of Water Deficits in Plants

Abstract: SUMMARYDepression of water potential. All '(d.p.d.), in the leaves, transpiration and stomatal aperture were measured on Ricinus cornmunis plants subjected to controlled levels of atmospheric evaporation m a climatological wind tunnel.It was found that the leaf All' of transpiring plants rooted in water took up a value of about 5 atm and remained unaffected by large changes in transpirational flux. When water was replaced by an osmoticum round the roots, leaf tJV merely rose to approach the AW'' of the medium.… Show more

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Cited by 69 publications
(37 citation statements)
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“…They also showed that transpiration rates at similar VPD were twice as high in plants rooted in water, compared with those rooted in soil, and that, unlike plants rooted in water, plants rooted in soil experienced a significant decrease in leaf water potential following an increase in transpiration rate. Macklon & Weatherley (1965) concluded from this that soil hydraulic resistance was the primary cause, in these plants, of water deficits in the leaf at high VPD. This could explain why herbaceous crop plants grown at high VPD exhibit reduced yields, even when well supplied with water (Woodward & Begg 1976;Sinclair,Tanner & Bennett 1984).…”
Section: Figurementioning
confidence: 91%
See 1 more Smart Citation
“…They also showed that transpiration rates at similar VPD were twice as high in plants rooted in water, compared with those rooted in soil, and that, unlike plants rooted in water, plants rooted in soil experienced a significant decrease in leaf water potential following an increase in transpiration rate. Macklon & Weatherley (1965) concluded from this that soil hydraulic resistance was the primary cause, in these plants, of water deficits in the leaf at high VPD. This could explain why herbaceous crop plants grown at high VPD exhibit reduced yields, even when well supplied with water (Woodward & Begg 1976;Sinclair,Tanner & Bennett 1984).…”
Section: Figurementioning
confidence: 91%
“…In experiments with castor bean (Ricinus communis) Macklon & Weatherley (1965) found that the leaf water potential of transpiring plants rooted in water changed little when transpirational flux was more than doubled. They also showed that transpiration rates at similar VPD were twice as high in plants rooted in water, compared with those rooted in soil, and that, unlike plants rooted in water, plants rooted in soil experienced a significant decrease in leaf water potential following an increase in transpiration rate.…”
Section: Figurementioning
confidence: 99%
“…Polyethylene glycol does not appear to be metabolized by plants, although there is evidence that it may be absorbed hy tomato (Janes, 1961;Macklon and Weatherley, 1965) and pea seedlings (Manohar, 1966a). Jackson (1962) observed that PEG caused a cessation of growth in Avena coleoptiles at higher osmotic potentials than did sucrose or mannitol, suggesting that PEG penetrated the tissues more slowly than the other two osmotica.…”
Section: Materi-\ls and Methodsmentioning
confidence: 99%
“…The calculation of i, from freezing point depression is unsatisfactory (9). Thermocouple psychrometry (9,11,13,(19)(20)(21) and vapor pressure osmometry (7,12,17) have been employed; however concentrations used to achieve f, values frequently have not been given (7,(11)(12)(13)(14)17) or were reported graphically (4,9,(19)(20)(21) …”
Section: Introductionmentioning
confidence: 99%