The Interrelations of Stomatal Aperture, Leaf Water-content, and Transpiration Rate

Knight, Rob

doi:10.1093/oxfordjournals.aob.a089642

Cited by 16 publications

(5 citation statements)

References 8 publications

(15 reference statements)

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“…Darwin (7) considered that the stomata play a predominating part in the control of transpiration, whilst Lloyd (23) thought that their importance was small. The question has been dealt with more fully elsewhere by the present writer (12).…”

Section: R Esearches On Transpiration In Recent Years Have Resultedmentioning

confidence: 96%

Recent Work on Transpiration

Knight

1917

New Phytologist

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Section: R Esearches On Transpiration In Recent Years Have Resultedmentioning

confidence: 96%

Recent Work on Transpiration

Knight

1917

New Phytologist

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“…In aU the experiments the leaves used were still joined to the parent plant. The reciprocals of roots of intervals between bubbles were taken as being proportional to stomatal aperture (Darwin, 1916;Knight, 1917).…”

Section: Sectionmentioning

confidence: 99%

The Effect of Potassium Supply on the Water Relations of Foliage Leaves

Warne

1936

New Phytologist

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With 4 figures in the text)T HE complexity of the relation between potassium supply and the water content of foliage leaves is well illustrated by the conflicting results which have, from time to time, been reported. With a variety of fruit plants Wallace (1931) finds that potassium deficiency is accompanied by a lowered water content in the foliage. Mann (1924) reports essentially similar results, also for fruit trees. With the potato James (1930) finds an agreement between the spatial distribution of potash and of water within the plant, but obtains an increased water content in the foliage with an increased potash supply only when the additional potash is supplied as chloride, and ascribes the effect to the chloride ion. Gregory & Richards (1929), in water culture experiments with barley, obtained with increased potash supply a decreased water content in the foliage. Manifestly, however, when the results are expressed on either the conventional fresh-weight or dry-weight basis, apparent variations in water content may be due as much to variations in dry matter as to real variation in water content. Certainly, a deficiency of potash is with a wide variety of plants reflected in the withering and scorching of the foliage (Wallace, 1934), and the assumption has been that the withering is the result of unfavourable conditions of water supply within the plant (Summers, 1922;Wallace, 1928).The results which will be described here were obtained from an experiment set up in 1933, in order to attempt an elucidation of the nature of the relation between potash supply and the water balance in foliage leaves. EXPERIMENTAL MaterialEoliage of seakale beet [Beta cicla) constituted the bulk of the material utilized, but water cultures of buckwheat were also used. Three sets of seakale beet were available which may conveniently be designated {a) garden plots, {b) soil pots, and (c) sand pots respectively.

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“…More than a century ago, Francis Darwin () combined two key observations that shape current understanding of the role of leaf water status in stomatal control: that ‘the guard cells share in the general turgor of the leaf’, and that ‘guard cells may lose turgor spontaneously, … in response to a stimulus [that] may be the slight flaccidity of the rest of the leaf’. The principle of this dual action was rejected by others at the time but is evident in the data of Knight () (Fig. ), and the two components later became known respectively as ‘hydropassive’ and ‘hydroactive’ stomatal responses to leaf water deficit (Stålfelt, , ; Raschke, ; Cowan, ).…”

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“…One of the first experiments to capture the complex response of stomata to leaf water deficit, prompting the ‘theory of the action of incipient drying’(data plotted from Knight, ). Stomatal aperture in Helianthus tuberosus , an angiosperm, initially increased and then decreased in response to increasing leaf water deficit.…”

mentioning

confidence: 99%

Passive and active stomatal control: either or both?

Franks

2013

New Phytologist

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The Interrelations of Stomatal Aperture, Leaf Water-content, and Transpiration Rate

Cited by 16 publications

References 8 publications

Recent Work on Transpiration

Recent Work on Transpiration

The Effect of Potassium Supply on the Water Relations of Foliage Leaves

Passive and active stomatal control: either or both?

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