The Involvement of Hydrogen Peroxide in the Differentiation of Secondary Walls in Cotton Fibers¹

Tamara S. Potikha, Cheryl C. Collins, Douglas I. Johnson, Deborah P. Delmer, and Alex Levine^*

Department of Plant Sciences, Hebrew University of Jerusalem, Jerusalem, Givat-Ram 91904, Israel (T.S.P., A.L.); Department of Microbiology and Molecular Genetics, University of Vermont, 202 Stafford Hall, Burlington, Vermont 05405 (C.C.C., D.I.J.); and Section of Plant Biology, University of California, One Shields Avenue, Davis, California 95616-8537 (D.P.D.)

H₂O₂ is a widespread molecule in many biological systems. It is created enzymatically in living cells during various oxidation reactions and by leakage of electrons from the electron transport chains. Depending on the concentration H₂O₂ can induce cell protective responses, programmed cell death, or necrosis. Here we provide evidence that H₂O₂ may function as a developmental signal in the differentiation of secondary walls in cotton (Gossypium hirsutum) fibers. Three lines of evidence support this conclusion: (a) the period of H₂O₂ generation coincided with the onset of secondary wall deposition, (b) inhibition of H₂O₂ production or scavenging the available H₂O₂ from the system prevented the wall differentiation process, and (c) exogenous addition of H₂O₂ prematurely promoted secondary wall formation in young fibers. Furthermore, we provide support for the concept that H₂O₂ generation could be mediated by the expression of the small GTPase Rac, the accumulation of which was shown previously to be strongly induced during the onset of secondary wall differentiation. In support of Rac's role in the activation of NADPH oxidase and the generation of reactive oxygen species, we transformed soybean (Glycine max) and Arabidopsis cells with mutated Rac genes. Transformation with a dominantly activated cotton Rac13 gene resulted in constitutively higher levels of H₂O₂, whereas transformation with the antisense and especially with dominant-negative Rac constructs decreased the levels of H₂O₂.

Plant Physiol. (1999) 119: 849-858
Copyright Clearance Center:   0032-0889/99/119//10
© 1999 American Society of Plant Physiologists

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