HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Endress, A. G. Articles by Taylor, O. C. Search for Related Content PubMed Articles by Endress, A. G. Articles by Taylor, O. C. Agricola Articles by Endress, A. G. Articles by Taylor, O. C.

Age-dependent Growth and Injury Responses of Pinto Bean Leaves to Gaseous Hydrogen Chloride¹

ABSTRACT

Susceptibility of unifoliate leaves of Phaseolus vulgaris L. to visible injury following acute exposures to anhydrous hydrogen chloride gas (HCl) and the relationship of susceptibility to leaf age and subsequent growth were examined. Plants varying in age from 6 to 12 days postseeding were treated with 25.6 ± 3.3 mg HCl m^–3 for 20 min. Foliar injury consisted primarily of abaxial glazing and bifacial interveinal necrosis. Plants that were 6 days old at the time of exposure were uninjured; the percent of injured unifoliate leaves increased with tissue age at the time of HCl treatment. The relationship was sigmoidal and probit analysis indicated that the estimated stage of maturity at which 50% of the unifoliate leaves became injured (EM₉₀) was 9 days. The rate of leaf expansion between control and fumigated leaves did not differ significantly, but expansion of the fumigated leaves was significantly delayed. The delay was apparently not directly related to visible foliar injury, nor were any differences in the relationship of leaf fresh weight to dry weight noted between control and HCl-treated leaves.

Key Words: age-dependent sensitivity • leaf area increase • fresh weight-dry weight ratio • probit analysis

¹ This work was supported by Grant no. AFOSR-76-3069 A,B from the U.S. Air Force Office of Sci. Res.

² Assistant Research Biologist and Associate Director, respectively, Statewide Air Pollut. Res. Center, Univ. of California, Riverside, CA 92521.

³ Plant Pathologist, California Dep. of Food and Agric.

Received for publication December 5, 1977.