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The Effect Of An Altered Cytokinin Metabolism On Plant Development And C Ell Aging In Crop Plants, Ian Mcevoy

Doctoral

Isopentenyl transferase (IPT) is an enzyme encoded by a bacterial gene that catalyzes the rate-limiting step in cytokinin biosynthesis. Under the control of senescence-associated promoter (pSAG12), isolated from Arabidopsis thaliana, it has been shown to delay senescence in several herbaceous species. Cytokinin synthesis begins at the onset of senescence and is then stopped when senescence ceases. This auto regulatory control of the transgene ensures normal development and morphology of the transformed plant, which may be affected in plants constitutively expressing ipt. In this study, it was investigated if an altered cytokinin metabolism, as a result of transformation by pSAG12: ipt, …