The effect of nitrogen supply on some indices of plantâwater relations of beans (phaseolus vulgaris l.)
1970
SHIMSHI, DANIEL
The effect of nitrogen supply on some indices of plantâwater relations was studied on potted bean plants. When soil moisture was relatively high, the leaves of Nâdeficient plants transpired less than those of Nâsupplied plants, the transpiration rate being closely associated with the chlorophyll content of the leaves of various ages. In detached leaves which were saturated by floating over distilled water, stomatal width was markedly wider in Nâsupplied than in Nâdeficient plants. Throughout the available moisture range, the water saturation deficit was higher in Nâsupplied leaves. In the dry range of soil moisture, chlorotic leaves transpired more than normal green leaves; Nâdeficient plants failed to exhibit a sharp rise in the content of soluble metabolites in the sap, when approaching the wilting range. The content of ‘cell wall materials’ was higher in Nâdeficient plants. The relationships between these indices is discussed; it is tentatively concluded that nitrogen deficiency impairs the ability of the plants to adjust their water status to changes in soil moisture by regulation of stomatal transpiration and of sapâsolute concentration.
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