Induction of responsiveness to octopine and lysopine in crown-gall tumors.
نویسندگان
چکیده
Bean leaf tumors induced by Agrobacterium tumefaciens strain 181 show enhanced growth in response to octopine or lysopine only if one of these compounds is present during the period of tumor induction. Either compound applied during this period results in tumors which subsequently respond to both. The combined action of the bacterium plus octopine or lysopine at induction is proposed to induce transcription of plant genes coding for enzymes involved in the degradation and/or biosynthesis of octopine and lysopine.
منابع مشابه
Promotion of crown-gall tumor growth by lysopine, octopine, nopaline, and carnosine.
The growth of crown-gall tumors on primary bean leaves (Phaseolus vulgaris L. cv. "Pinto") was promoted by the addition of d-lysopine, d-octopine, l-carnosine, or nopaline. Assayed on tumors induced by Agrobacterium tumefaciens strain B6, the relative activity was octopine = carnosine > lysopine >> nopaline; assayed on tumors induced by A. tumefaciens strain T-37, which induces tumors which for...
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Fragment EcoRI 7 from Ti-plasmid pTi Ach5, a part of the T-DNA in octopine tumors, was cloned in both orientations into pACYC184 and expressed in E. coli minicells. The cells synthesized four proteins from four different coding regions on EcoRI 7. Two of the proteins (Mr 25.000 and 26.000) were expressed with promoters from the Ti-plasmid fragment, while transcription for the two other proteins...
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ورودعنوان ژورنال:
- Plant physiology
دوره 56 2 شماره
صفحات -
تاریخ انتشار 1975