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  • Lin E
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approved: Machteld C. Mok Cytokinins can be conjugated to N-and O-glucosides. While N-glucosylation generally leads to irretrievable loss of activity, O-glucosides are thought to play an important role in cytokinin storage and homeostasis since they can be hydrolyzed to the corresponding aglycones. The first zeatin O-glycosyltransferase genes isolated were ZOG1 and ZOX1 from beans (Martin et al., 1999a,b), and more recently cytokinin O-and N-glucosyltransferase genes were identified in Arabidopsis (Hou et al., 2005). To study the effects of cytokinin O-glucosylation in monocots, maize (Zea mays) transformants harboring the ZOG1 gene under the control of the constitutive ubiquitin (Ubi) promoter were generated. The vegetative characteristics of hemizygous and homozygous Ubi:ZOG1 plants resembled those of cytokinin deficiency, including shorter stature, thinner stems, narrower leaves, smaller meristems, and increased root mass and branching. On the other hand, chlorophyll levels were higher and senescence was delayed in transformants when grown in the spring/summer. Unexpected modifications in reproductive development occurred as well. Hemizygous transformants had reduced tassels with fewer spikelets but normal viable pollen. Homozygotes had very small tassels and feminized tassel florets, resembling the tasselseed

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  • Ernie Lin

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