We measured the rate of growth, osmotic pressure, hydraulic conductance, longitudinal and transverse extensibility of barley (Hordeum vulgare L.) roots in Knop solution with nitrate and at substitution of NO 3 − with Cl−. During the first three days after NO 3 − removal, root growth acceleration was related to the increase in their longitudinal extensibility. It was shown that root exposure to buffer with pH 4.5 and also activation of H+ pump with naphthyl acetate imitated changes in extensibility induced by NO 3 − deficit. Earlier, we have demonstrated medium acidification near root surface and calculated its expected level (pH 4.5). This permits a supposition that the cause for changes in extensibility and root growth acceleration at NO 3 − deficit was apoplast acidification, evidently related to the ceasing of NO 3 − symport with H+ and activation of the plasmalemmal H+ pump. ABA did not affect root extensibility at pH 4.5; however, at pH 6.0, it was similar to the action of diethylstilbestrol, an inhibitor of H+ pump, and opposite to the action of NO 3 − deficit. Thus, the absence of ABA effects on root growth, in spite of its accumulation at NO 3 − deficit, could be explained by apoplast acidification as well.
Russian Journal of Plant Physiology – Springer Journals
Published: Jul 7, 2010
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