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Genes Involved in Osmoregulation during Turgor-Driven Cell Expansion of Developing Cotton Fibers Are Differentially Regulated1

Lawrence B. Smart2, 3, Fakrieh Vojdani3, Masayoshi Maeshima, and Thea A. Wilkins*

Department of Vegetable Crops (L.B.S.), and Department of Agronomy and Range Science (F.V., T.A.W.), University of California, Davis, California 95616; and University of California, Davis, California 95616Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan (M.M.)

Cotton (Gossypium hirsutum L.) fibers are single-celled trichomes that synchronously undergo a phase of rapid cell expansion, then a phase including secondary cell wall deposition, and finally maturation. To determine if there is coordinated regulation of gene expression during fiber expansion, we analyzed the expression of components involved in turgor regulation and a cytoskeletal protein by measuring levels of mRNA and protein accumulation and enzyme activity. Fragments of the genes for the plasma membrane proton-translocating ATPase, vacuole-ATPase, proton-translocating pyrophosphatase (PPase), phosphoenolpyruvate carboxylase, major intrinsic protein, and alpha -tubulin were amplified by polymerase chain reaction and used as probes in ribonuclease protection assays of RNA from a fiber developmental series, revealing two discrete patterns of mRNA accumulation. Transcripts of all but the PPase accumulated to highest levels during the period of peak expansion (+12-15 d postanthesis [dpa]), then declined with the onset of secondary cell wall synthesis. The PPase was constitutively expressed through fiber development. Activity of the two proton-translocating-ATPases peaked at +15 dpa, whereas PPase activity peaked at +20 dpa, suggesting that all are involved in the process of cell expansion but with varying roles. Patterns of protein accumulation and enzyme activity for some of the proteins examined suggest posttranslational regulation through fiber development.

1   This work was supported by funding from Cotton Incorporated and the U.S. Department of Energy. L.B.S. was supported by a National Science Foundation postdoctoral fellowship in plant biology (no. BIR-9203665).
2   Present address: State University of New York (SUNY) College of Environmental Science and Forestry, Faculty of Environmental and Forest Biology, One Forestry Drive, 302 Illick Hall, Syracuse, NY 13210.
3   These authors contributed equally to the paper.
*   Corresponding author; e-mail tawilkins{at}ucdavis.edu; fax 1-916-752-4361.

Plant Physiol. (1998) 116: 1539-1549
Copyright Clearance Center:   0032-0889/98/116/1539/11
© 1998 American Society of Plant Physiologists




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