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PLANT PHYSIOLOGY , Vol 110, Issue 2 377-385, Copyright © 1996 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Mutants in Arabidopsis thaliana Altered in Epicuticular Wax and Leaf Morphology
M. A. Jenks, A. M. Rashotte, H. A. Tuttle and K. A. Feldmann
Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721
We report eight new mutants in Arabidopsis thaliana possessing altered leaf
morphology and epicuticular wax. These were isolated from a
T-DNA-mutagenized population using a visual screen for altered leaf
reflectance, i.e. increased glaucousness or glossiness. The mutants were
placed into three distinct classes based on alterations in overall plant
morphology: knobhead (knb), bicentifolia (bcf), and wax. The four knb
mutants formed callus-like growths in the axillary region of the rosette
leaves and apical meristem, the two bcf mutants produced hundreds of narrow
leaves, and the two wax mutants had leaves and stems that were more glossy
than wild type and organs that fused during early development. Leaves of
knb and bcf were more glaucous and abnormally shaped than wild type.
Epicuticular wax crystals over knb and bcf leaf surfaces (where none were
present on wild type) likely contributed to their more glaucous appearance.
In contrast, the glossy appearance of the wax mutants was associated with a
reduced epicuticular wax load on both leaves and stems. One representative
from each phenotypic class was selected for detailed analyses of
epicuticular wax chemistry. All three lines, knb1, bcf1, and wax1, had
dramatic alterations in the total amounts and relative proportions of their
leaf epicuticular wax constituents.
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