Delayed Leaf Senescence by Upregulation of Cytokinin Biosynthesis Specifically in Tomato Roots.

ABSTRACT: Cytokinins (CKs) regulate numerous plant developmental processes, including photosynthesis and leaf senescence. Isopentenyltransferase (IPT) is a rate-limiting enzyme in the CK-biosynthesis pathway. We overexpressed ipt under tissue-specific promoters to study the long-range effect of CK on the functioning of tomato source leaves. Photosynthetic activity over time provided the measure for leaf aging. Significantly delayed leaf senescence was observed in plants expressing ipt under a root-specific promoter, but not in those expressing the gene under a source leaf-specific promoter. The root-derived influence on leaf aging was further confirmed by grafting experiments. CK concentration in source leaves of both transgenic lines increased significantly, with different proportions of its variou

SUBMITTER: Glanz-Idan N 

PROVIDER: S-EPMC9298850 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature