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GrainGenes Reference Report: PPS-124-813

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Reference	PPS-124-813
Title	Gibberellin-induced changes in growth anisotropy precede gibberellin-dependent changes in cortical microtubule orientation in developing epidermal cells of barley leaves. Kinematic and cytological studies on a gibberellin-responsive dwarf mutant, M489
Journal	Plant Physiology
Year	2000
Volume	124
Pages	813-822
Author	Wenzel CL Williamson RE Wasteneys GO
Abstract	Summary: We conducted kinematic and cytological studies on 'between vein' epidermal cells of the gibberellin (GA)-deficient M489 dwarf mutant of barley (Hordeum vulgare L. Himalaya). GAs affect radial and axial components of cell expansion and cortical microtubule orientation. Adaxial cells in particular expand radially after leaving the elongation zone (EZ), probably as part of leaf unrolling. Exogenous gibberellic acid corrects the mutant's short, wide blades, short EZ, and slow elongation rate. Cell production rates increase more on the adaxial than on the abaxial surface. Cells spend equal periods of time elongating in dwarf and tall plants, but relative elemental growth rates start to decline sooner in the dwarf. GA increased the rate at which longitudinal wall area increased because the increased axial growth more than compensated for reduced radial growth. In dwarf leaves, increased radial expansion was detected in basal parts of the EZ before cortical microtubules lost transverse orientation in the distal elongation zone. We conclude that loss of microtubule orientation is not required for low GA levels to reduce growth anisotropy
External Databases	Pubmed: 11027729
Keyword	[ Hide all but 1 of 25 ] azuki bean epicotyls barley barley leaves cell cortical microtubules cyclic reorientation elongation elongation zone epidermal cells expansion gibberellic acid gibberellin growth growth anisotropy growth rate hordeum vulgare leaf sheath-cells lycopersicon esculentum maize roots microtubules mutant orientation spatial distribution wall microfibrils wheat leaves

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