Abstract
A plastochron index (PI) based on a 3‐mm leaf reference length was established for the Columbia‐1 (Col‐1) ecotype and the se (serrate) mutant of Arabidopsis thaliana for quantitative analysis of leaf development. The three underlying assumptions for PI establishment—early exponential leaf growth rate, similar relative growth rates (RGRs), and plastochrons between successive leaves—were tested. Under a 10‐h day length, the three assumptions held for leaves 11–37 of Col‐1 and for leaves 7–37 of se. The mean plastochron of se was about 1.5 times longer than that of Col‐1, and the mean RGR of Col‐1 was about 1.25 times greater than that of se.
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