-abscisic acid ( S -ABA), a natural ABA enantiomer, are effective at increasing endogenous ABA levels ( Ferrara et al., 2013 ), accelerating the coloring process ( CantÃn et al., 2007 ) and increasing the uniformity of the color of grape clusters ( Koyama et
relationship between g S and photosynthesis was different in ‘Braeburn’ and ‘Fuji’ apples, although net CO 2 assimilation rate in both cultivars was positively related to g S . ABA is rapidly catabolized in plants, principally through oxidation of the 8
Desiccation of containerized plants at retail outlets due to inadequate watering is a recurring problem. Water stress can decrease plant quality and survivability. Treatments that could reduce plant transpiration without lowering plant quality could be beneficial in maximizing the likelihood that plants would not become water stressed between waterings at retail outlets. Abscisic acid (ABA) is known to be involved in the regulation of stomatal aperatures, the major control mechanism for transpirational water loss. Containerized plants of four cultivars of hibiscus were thoroughly sprayed with S-ABA at concentrations of 0, 125, 250 or 500 mg·L–1. Plants were held under simulated retail conditions and were not watered until visible wilting occurred. Transpiration and pot weights were monitored over time. Transpiration rates and weight loss percentages were negatively correlated with S-ABA concentrations. Effects on transpiration rates lasted for at least 30 hours after treatment. For mean hours to wilt, there was interaction between S-ABA treatments and cultivars. For the most sensitive cultivar (`Double Apricot'), treatment with S-ABA at 500 mg·L–1 almost doubled the time to plant wilt (130 h) compared to the control treatment (72 hours). Hours to wilt was increased 24% for `Double Pink' treated at the highest rate. For `Double Red' and `Single Pink', hours to wilt was not affected by treatments. For some hibiscus, S-ABA treatments prior to placement of plants at retail outlets might decrease the chances that the plants would become severely water stressed.
By using the micro-volume radio-ligand binding essay, the changes in the kinetic characteristics of the abscisic acid (ABA)-binding protein(s) of the Kyhoh grapevine (Vitis vinifera × V. labrusca) fruit during the different stages of fruit development have been studied. The changes in the berry volume growth, concentration of sugar, organic acids, and ABA in fruit mesocarp have been surveyed, especially for studies of ABA-binding protein. The dissociation constant (Kd) and ABA binding maximum (Bmax) were determined by the Scatchard plots for ABA binding in microsomes of the fruit. They are Kd = 17.5, 50.0, 6.3, 13.3 nmol·L–1; Bmax = 98.6, 523.0, 41.6, 85.4 μmol·mg–1 protein, respectively, for the fruit developmental phase I, II, veraison, and phase III. The Scatchard plots showed a rectilinear function for all of the developmental phases including veraison, which suggests the sole ABA-binding site of high affinity for ABA in the fruit microsomes, but this site could either be only one kind of the same protein or consist of more kinds of different proteins for different developmental stages. The binding affinity of ABA-binding protein(s) for ABA was shown to be higher at veraison time than during other developmental phases; this binding affinity increased nearly by 10 times from phase II to veraison, while the concentration (Bmax) of the ABA-binding protein(s) decreased to the minimum at veraison. The very low concentration of ABA at veraison may be able to trigger the onset of fruit ripening due to the increase of the binding affinity of ABA-binding protein(s) for ABA at this time. The possible functions of the ABA-binding protein(s) for fruit development during the different developmental stages were discussed, and it is suggested that the protein(s) detected could be the putative ABA receptor(s) or transporter(s) for the action of this plant hormone in grapevine.
transplanting according to the commercial nursery. The formulation of ABA stock solution was VBC-30151 (Valent BioSciences) containing 10% of S-ABA, a naturally occurring active form in plants. Uniconazole was formulated as Sumagic. Test solutions were prepared
-modulating effects and phytotoxicity of ABA in muskmelon seedlings over a range of concentrations from 0.24 to 7.57 m m ( Agehara and Leskovar, 2012 ). The formulation of ABA stock solution was VBC-30151 (Valent BioSciences, Libertyville, IL) containing 10% of S-ABA
). Experiments with a new ABA formulation (s-ABA; ConTego™; Valent BioSciences Corp.) have shown that sprench (spray to runoff) applications of 125 or 250 mg·L −1 delay drought-induced wilting symptoms in seven of nine species of bedding plants that were
-induced wilting ( Goreta et al., 2007 ). A new commercial product containing s-ABA, the biologically active form of ABA, ConTego (Valent BioSciences, Libertyville, IL), delays wilting in a variety of bedding plants under severe drought stress ( Blanchard et al
treated with drench or spray applications of s-ABA. Leaf chlorosis in pansies was not directly induced by drought treatment, because symptoms were observed in both watered and drought-stressed plants that were treated with s-ABA ( Waterland et al., 2010
bermudagrass crowns is a chitinase Crop Sci. 36 712 718 10.2135/cropsci1996.0011183X003600030032x Gilmour, S.J. Thomashow, M.F. 1991 Cold acclimation and cold-regulated gene expression in ABA mutants of Arabidopsis