Agrobacterium tumefaciens Site Attachment as a Necessary Prerequisite for Crown Gall Tumor Formation on Potato Discs

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Abstract
Treatment of mature citrus fruit (Citrus sinensis) with ethylene induced rapid chlorophyll destruction, a rise in respiration, a release of free amino acids, an accumulation of reducing sugars, and an appearance of phenylalanine ammonia lyase activity. Gibberellin A3 (GA3) and N6-benzyladenine (BA) opposed the effects of ethylene on chlorophyll, amino acids, and to a lesser extent, reducing sugar levels. The ethylene-induced respiratory rise was only slightly modified by GA3 and BA. Phenylalanine ammonia lyase activity was not affected by GA3.