The Ozone Sensitivity of Petunia hybrida Vilm. as Related to Physiological Age1

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George P. Hanson Los Angeles State and County Arboretum, Arcadia, California

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Linda Thorne Los Angeles State and County Arboretum, Arcadia, California

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Daniel H. Addis Los Angeles State and County Arboretum, Arcadia, California

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George P. Hanson Los Angeles State and County Arboretum, Arcadia, California

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Linda Thorne Los Angeles State and County Arboretum, Arcadia, California

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Daniel H. Addis Los Angeles State and County Arboretum, Arcadia, California

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Contributor Notes

Received for publication June 19, 1974.

Financial support from the U.S. Environmental Protection Agency (Grant #R-801428) is gratefully acknowledged. We also thank John Mondry formerly of Bodger Seeds, Ltd., El Monte, CA, and John M. Barna of Joseph Harris Company, Inc., Rochester, NY for seed stocks used in this study.

Maksymowch (7) has defined a plastochron as the time interval between initiation of two successive leaves.

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