Involvement of ethylene in the potassium nitrate-induced flowering of mango
2003
Serrano, E.P. | Marquez, I.B. (Philippines Univ. Los Banos, College, Laguna (Philippines). Postharvest Horticulture and Training Center) Protacio, C.M.
In an effort to determine the involvement of ethylene in the KNO3-induced flowering of 13-year old `Carabao' mango, 1 mM amino-oxyacetic acid (AOA) and 1 mM silver thiosulfate (STS), which are ethylene biosynthesis and ethylene action inhibitors respectively, were applied before spraying KNO3. With KNO3, flowering was 82%, respectively. When applied alone, AOA treatment of the shoots resulted in 36% flowering while STS spray resulted in 35% flowering. These were not significantly different from the untreated shoots which showed 43% flowering. This indicates that these compounds have no inhibitory influence on flowering nor any nonspecific effects. Application of KNO3 did not result in increased ethylene (0.34 nL/g-hr as compared to 0.24 nL/g-hr determined from the control) or 1-aminocyclopropane-1-carboxylic acid (ACC) production in the shoots (0.10 nmol/g as compared to 0.08 nmol/g for the control). However, application of AOA alone significantly increased ACC content (0.26 nmol/g) and ethylene production (1.35 L/g-hr). With KN03 plus AOA, ACC level of ethylene production in the shoots also increased to 0.23 nmol/g and 1.95 nL/g-hr, respectively. These data indicate that AOA does not exert any inhibitory action on ACC synthase of mango at the present concentration used. Presumably, KNO3 does not act at the ethylene biosynthetic pathway but at the level of ethylene action
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