Abstract:
:We present four examples of attenuation of the transformed phenotype caused by the root-inducing, left-hand, transferred DNA from Agrobacterium rhizogenes in tobacco (Nicotiana tabacum). The first was associated with a genetic variable (homozygosity for the T-DNA), and the second was induced at the physiological level by putrescine and tyramine, suggesting that the transformed phenotype depends on defective polyamine metabolism. Physiological attenuation is further illustrated in the third example, in which the inhibition of flowering caused by P35S-rolA, a gene from the root-inducing, left-hand, transferred DNA driven by a strong viral promoter, was attenuated by grafting the transformed shoot onto non-transformed rootstock that had been induced to flower. Infertility in the resulting flowers was corrected by a mixture of putrescine and tyramine, indicating that P35S-rolA inhibited flowering through interference with polyamine conjugation and that tyramine was essential to fertility. A fourth example of attenuation of the transformed phenotype occurred in lateral branches of plants expressing rolA under the control of its native promoter. In these branches, reduction in the accumulation of rolA transcripts was correlated with the methylation of a site 3[prime] to the rolA coding sequence; thus, the transformed plant seems capable of recognizing and repressing a gene that interferes with flowering.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Martin-Tanguy J,Sun LY,Burtin D,Vernoy R,Rossin N,Tepfer Ddoi
10.1104/pp.111.1.259subject
Has Abstractpub_date
1996-05-01 00:00:00pages
259-267issue
1eissn
0032-0889issn
1532-2548pii
111/1/259journal_volume
111pub_type
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