MCD BIO C141 Lecture Notes - Lecture 9: Arabidopsis Thaliana, Microrna, Meristem
15 May 2020
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Recall the difference between simple and compound leaves. Recognize why tomatoes make a good model system for compound leaf development. Discuss the pathways and characteristics of adaxial/abaxial determination. There is a lot of variety between leaf shape and size. The shape of the leaf is determined by combination of longitudinal and mediolateral growth. Parts of the leaves wrap around tendrils to help it grow. Maybe not the best model to understand compound leaf development. Kn1 semi-dominant alleles in maize and weak overexpression of knox genes in arabidopsis gave clues to a possible role for knox genes in leaf lobing. Moved from maize to ab and over expression leads to less meristem. But can turn a simple leaf into a compound leaf. Arabidopsis thaliana produces simple leaves but other closely related brassica produce compound leaves. Closely related species get a little more complex. Found that stm expression in leaf primordia was causing this complexity.
