The role of ethylene in phosphorus-induced fruit and leaf abscission in satsuma mandarin [Citrus unshiu]
2002
"Yamada, H. (Ehime Univ., Matsuyama (Japan). Coll. of Agriculture) | Kanno, S. | Amano, S. | Kadoya, K. "
"When phosphorus was applied as a foliar spray to satsuma mandarin (Citrus u.nsll.iu Marc. var. praecox Tanaka cv. Okitsuwase) bearing shoots, Ieaf abscission was markedly promoted regardless of application timing, although fruitiet abscission was negligible. Ethylene evolution from the explants sprayed with ethephon (ETP), phosphoric acid (PA), or sodium phosphate (SP) was higher than the water-sprayed control duringa the first few days after spray. Fruit and/or leaf abscission were induced after 3 days after spray. Ethylene biosynthetic inhibitors, aminooxyacetic acid (AOA) and aminoethoxyvinylglycine (AVG), that were stem-fed with PA and SP inhibited ethylene production and fruit and leaf abscission induced by phosphorus. Vegetative spring shoots excised in autLtmn and stem-fed with PA and SP drastically increased ethylene evolution immediately after the beginning of the treatment, followed by leaf abscission after 2 days of treatment. No marked increase of 1-amino-cyclopropane-1-carboxylic acid (ACC) content was obs+D1164erved up to 2 days of the treatment. These results suggest that phosphorus induces fruit and leaf abscission via increased ethylene production in satsuma mandarin."
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