Kang, Hui , Sims, Thomas .
JOINTLESS is a pleiotropic regulator of tomato development
--- --- A MADS-box gene that might regulate auxin production or perception.
JOINTLESS is a MADS-box gene and it has been proven to play a key role in tomato flower pedicel abscission zone development. In jointless plants, some inflorescence meristems also revert to vegetative growth, their flowering time is delayed, and the sympodial identity in inflorescence meristems of the jointless plants is suppressed. However, we still don't know how JOINTLESS causes the pleiotropic effects. Here we report more evidence that JOINTLESS is a pleiotropic regulator of tomato development. Jointless seedlings have thicker and longer hypocotyls than that of wild type seedlings. Dark-grown jointless seedlings have shorter hypocotyls than seedlings grown in the light. The hypocotyls cells of jointless seedlings are longer than those of wild type seedlings. Jointless seedlings have more root hairs than wild type seedlings and more lateral roots than wild type seedlings. In preliminary assays, jointless seedlings appear to have the same sensitivity to ethylene as wild type in terms of seedling root growth. However, jointless hypocotyls appear less sensitive to ethylene than wild type seedlings. Adult jointless plants grow faster and have longer internodes than wild type plants. Wild type seeds are smaller than jointless seeds and the germination rate of jointless seeds is also lower than that of wild type seeds. We propose that JOINTLESS might affect the perception or production of auxin, leading to the pleiotropic effects on tomato development.
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1 - Northern Illinois University, Biological Sciences Department and Plant Molecular Biology Center, DeKalb, IL, 60115, USA
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM