This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Poovaiah, B. W. Articles by Rasmussen, H. P. Search for Related Content PubMed PubMed Citation Articles by Poovaiah, B. W. Articles by Rasmussen, H. P. Agricola Articles by Poovaiah, B. W. Articles by Rasmussen, H. P.

Articles

Calcium Distribution in the Abscission Zone of Bean Leaves

Electron Microprobe X-Ray Analysis ¹

H. P. Rasmussen^b

^a Department of Horticulture, Purdue University, Lafayette, Indiana 47907, Department of Horticulture, Michigan State University, East Lansing, Michigan 48823

The calcium content and distribution across the abscission zones of (2-chloroethyl) phosphonic acid-treated bean (Phaseolus vulgaris L. var. Contender) leaves were lower and not uniformly distributed as compared to the control. Calcium chloride-treated bean leaves had a higher calcium content, with more calcium localized in the potential abscission layer. Ethephon treatment promoted abscission in both debladed and nondebladed plants; there was a corresponding decrease in calcium in the abscission zone just prior to separation. Deblading of bean leaves under a calcium solution increased the calcium level in the abscission zone and delayed abscission.