Droopy: a wilty mutant of potato deficient in abscisic acid

Abstract

Droopy tnutant of potato {Solanum tuberosutn L,, group Phurefa) wilts because of excessive stomatal opening (Waggoner & Simmonds, 1966), Progeny of the cross between potato clones CP.C, 4461 and C,P,C, 4463 showed eharactet istics sitnilar to those of the original droopy potato. These plants wilted at high vapour pressure deficit and their stotnatal conductances in the light and the dark were higher than those of nortnal plants. Conductances were reduced by applied abscisic acid (ABA), but stotnata remained partially open even when guard cells were plastnolysed. Leaves of droopy plants accutnulated very little ABA when water-stressed.

Regulation in Rhizome Transition to Storage Organ in Lotus (Nelumbo nucifera Gaertn.) with Exogenous Gibberellin, Gibberellin Biosynthesis Inhibitors or Abscisic Acid

“…Tuberization was promoted when ABA was applied to the leaves of potato plants growing under LD (El-Antably et al, 1967). Similar effects of ABA on tuberization under tuber non-inducing conditions (1% sucrose) were confirmed using an in vitro system, in which tuber formation was controlled by sucrose concentration; culture with medium including 1% sucrose induces stolon elongation (Xu et al, 1998); however, an ABA-deficient mutant of potato, Droopy, was able to tuberize normally (Quarrie, 1982). It is therefore concluded that ABA synthesis is not required for tuber induction (Jackson, 1999;Rodriguez-Falcon et al, 2006), and the stimulatory effects of exogenous ABA were proposed to be due to an antagonistic effect between ABA and GA (Xu et al, 1998).…”

Multiple Signaling Pathways Control Tuber Induction in Potato

“…ABA levels in shoots and roots of potato have also been shown to be affected by nitrogen levels (Krauss, 1985). However, as an ABAdeficient mutant of potato, Droopy is able to tuberize (Quarrie, 1982), and it is clear that ABA is not an essential component of the tuberization stimulus. The promotive effects of ABA on tuberization, both in soil-grown plants and in vitro, appear to be due to the antagonistic effects of ABA and GA (Xu et al, 1998).…”

General roles of abscisic and jasmonic acids in gene activation as a result of mechanical wounding.

“…This allowed us to examine the expression of the different genes in the ABA-deficient background corresponding to the potato droopy mutants (Quarrie, 1982). As shown in Figure 3, transcript levels attained upon wounding, for all four genes, were much lower in the ABA-deficient mutant than they were in the wild-type plants, with the mutant being clearly impaired in wound response.…”

“…Potato plants Solanum tuberosum cv Désiree; the diploid relative S. phureja, and the corresponding abscisic'acid (ABA)-deficient'droopy mutant (Quarrie, 1982) were used as experimental material. Seeds of both S. phureja and droopy potato plants were kindly provided by S. A. Quarrie, and plants were thereafter vegetatively propagated from cuttings.…”