Hartung Wolfram
Botanisches Institut der Universität, Mittlerer Dallenbergweg 64, D-8700, Würzburg, Germany.
Oecologia. 1976 Jun;26(2):177-183. doi: 10.1007/BF00582895.
Eight- to 10-day-old plants ofPhaseolus coccineus, which grow on vermiculite with a water content of 12-17% of the water-holding capacity, stop growing completely, whereas water potential and relative water content are almost unaffected. [2-C]Abscisic acid, which is applied to the midrib of a primary leaf, is transported especially to the roots and the apical bud, but not to the second primary leaf and the cotyledons. Water-stressed plants, however, export only negligible amounts of ABA from the donor leaf to the plant. Thus an accumulation of ABA occurs in the donor leaf. Consequently water stress can increase ABA concentration in leaves not only by stimulating ABA synthesis but also by inhibiting ABA transport. Recovery of growth and ABA transport after reirrigation is very weak. Water stress has no effect on ABA metabolism in bean plants.
生长在蛭石上、含水量为持水量12 - 17%的8至10日龄红花菜豆植株会完全停止生长，而水势和相对含水量几乎不受影响。[2 - C]脱落酸施用于初生叶的中脉后，尤其会运输到根部和顶芽，但不会运输到第二片初生叶和子叶。然而，水分胁迫的植株从供体叶向植株输出的脱落酸量微乎其微。因此，脱落酸在供体叶中积累。所以，水分胁迫不仅可以通过刺激脱落酸合成，还可以通过抑制脱落酸运输来提高叶片中的脱落酸浓度。再灌溉后生长和脱落酸运输的恢复非常微弱。水分胁迫对菜豆植株中的脱落酸代谢没有影响。
