The Relationship between Environmental Factors and Behaviour of Stomata in the Rice Plants : VII. The relation between nitrogen content in leaf blades and Stomatal aperture

Nitrogen nutrition and canopy temperature in field-grown spring wheat

“…This is suggested by observations on cotton, beans and rice, where nitrogen defficiency increases stomatal sensitivity to moisture stress. Stomata close at higher leaf water potentials and the plants become water 'savers' (Radin & Parker, 1979;Radin & Ackerson, 1981;Shimshi, 1970;Ishihara et al 1978). If this phenomenon also occurs in wheat, moderate diurnal moisture stress in nitrogen-deficient plots would lead to a sharp reduction in stomatal conductance, causing more of the net radiation flux to appear as sensible heat flux.…”

Early detection of N deficiency in a wheat crop using physiological and radiometric methods

“…The resulting suspension was centrifuged at 30 000 g for 20 min. Proteolytic activity was determined as described by Peterson and Huffaker [23] by incubating 0.2 mL of the supernatant and 0.3 mL azocaseine (previously heated at 100 °C for 2 min to prevent autohydrolysis) with 0.5 mL 0.1 M citrate-potassium-phosphate buffer (pH 5.6) at 40 °C for 2 h. The reaction was stopped by adding 2 mL perchloric acid (12 %) [14] and wheat [30] and root conductivity in sunflower [24] are less in Ndeficient plants than in controls. Under these conditions, lower transpiration rates would reduce the ionic concentration of the leaves, especially of nitrate and potassium ions, thereby favouring proteolytic degradation [33].…”

Rice varietal differences in responses of stomatal gas exchange to supplemental nitrogen application

“…In principle, an increase in g s , which regulates the exchange of both CO 2 and water, can allow plants to increase their CO 2 assimilation. Ishihara et al (1978) reported that high leaf N content enlarged stomatal aperture in one japonica variety. To evaluate varietal differences of the effects of supplemental N on stomatal aperture and gas exchange traits, it is necessary to determine differences during the grain-filling period and to clarify the relationship of g s to leaf N content.…”