Acetolactate Synthase Inhibitors Increase Ethylene Production and Cause Fruit Drop in Citrus

Fruit Respiration and Ethylene Production.

Characterization of abscisic Acid-induced ethylene production in citrus leaf and tomato fruit tissues.

Abscisic acid (ABA) significantly stimulated ethylene production in citrus (Citrus sinensis [L.] Osbeck, cv Shamouti orange) leaf discs. The extent of stimulation was dependent upon the concentration of ABA (0.1-1 milimolar) and the duration of treatment (15-300 minutes). Aging the discs before applying ABA increased ABA-induced ethylene production due to enhancement of both ethylene-forming en...

Wound-induced Ethylene Formation in Albedo Tissue of Citrus Fruit.

Excised albedo tissue of citrus fruit (Citrus unshiu and Citrus hassaku) produced ethylene at an increasing rate in response to wounding and aging. The application of 1-aminocyclopropane-1-carboxylic acid (ACC) enhanced ethylene production in both the fresh and aged tissues, but this increase was greater in the aged tissue than in the fresh tissue. ACC content was very low in fresh tissue but i...

Safeners as Corn Seedling Protectants against Acetolactate Synthase Inhibitors*

Zea mays L., cv. Potro, shoots had a higher level o f resistance to imazaquin (IQ) and metsul­ furon methyl (M SM ) than roots. Shoot lengths were increased by pretreating the seeds with commercial 1,8 -naphthalic anhydride (N A ) at 1% (w/w) or oxabetrinil at 0.2% (w/w). The growth o f shoots o f safened seeds was unaffected by 400 nM IQ and by 40 nM MSM. The in vivo activity o f acetolactate ...

Ethylene Production by Albedo Tissue of Satsuma Mandarin (Citrus unshiu Marc.) Fruit.

Isolated albedo tissue of Satsuma mandarin (Citrus unshiu Marcovitch, cv. Owari) fruit produced a large quantity of ethylene during incubation at 26 C in the dark. When sliced, albedo tissue began producing ethylene at an increasing rate until a maximum was reached after incubation for about 30 hours. Aged albedo discs which were capable of producing ethylene, actively converted l-[U-(14)C]meth...