Mineral Nutrition Laboratory, USDA, ARS, SWCRD, Beltsville, Maryland.
Plant Physiol. 1969 Sep;44(9):1233-40. doi: 10.1104/pp.44.9.1233.
The uptake of Na(+) and K(+) by barley seedlings grown on aerated or non-aerated solutions was studied. Plants growing in culture solution took up K(+) with high selectivity whether the solution was aerated or not. Roots of plants grown on aerated CaSO(4) and transferred to a solution of KCl and NaCl had a lower preference for K(+) than roots of plants grown on non-aerated CaSO(4). Both kinds of low-salt roots were much less able to discriminate between K(+) and Na(+) than high-salt roots grown on a culture solution. The different levels of K(+) selectivity are suggested to be related to H(+) release from the tissue.
研究了在充气和非充气溶液中生长的大麦幼苗对 Na(+) 和 K(+) 的吸收。无论溶液是否充气，在培养溶液中生长的植物对 K(+) 的选择性吸收很高。在充气的 CaSO(4)中生长并转移到 KCl 和 NaCl 溶液中的植物的根对 K(+)的偏好低于在非充气的 CaSO(4)中生长的植物的根。与在培养液中生长的高盐根相比，这两种低盐根在区分 K(+)和 Na(+)方面的能力要差得多。不同水平的 K(+)选择性被认为与组织中 H(+)的释放有关。
