菜豆根系的脱落酸运输系数
Abscisic Acid transport coefficients of phaseolus root systems.
作者信息
Fiscus E L, Stermitz F R, Amoros L G
机构信息
United States Department of Agriculture-Agricultural Research Service, Crops Research Laboratory, Colorado State University, Fort Collins, Colorado 80523.
出版信息
Plant Physiol. 1982 Jun;69(6):1353-5. doi: 10.1104/pp.69.6.1353.
Diffusive and convective transport coefficients of Phaseolus vulgaris L. cv. Ouray root systems for abscisic acid for (ABA) were measured. The convective coefficient (reflection coefficient or osmotic efficiency factor) sigma was determined to be 0.96 for ABA while the diffusive coefficient, omega, was found to be 1.44 x 10(-11) mole per square centimeter per second per bar. Steady-state concentrations of ABA in the root system exudates were not achieved until at least three hours after the applications suggesting either a slow saturation of binding sites or equilibration with tissues surrounding the xylem.
对菜豆品种Ouray根系中脱落酸（ABA）的扩散和对流运输系数进行了测量。ABA的对流系数（反射系数或渗透效率因子）σ测定为0.96，而扩散系数ω为1.44×10⁻¹¹摩尔每平方厘米每秒每巴。在施用ABA后至少三小时才达到根系分泌物中ABA的稳态浓度，这表明要么是结合位点缓慢饱和，要么是与木质部周围组织达到平衡。
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