Abstract
Fine-tuning of morphology and length of leaf blade and petiole is quite important for efficient photosynthesis of plants under a variety of environments they live. Plant hormones and light signaling play key roles in the control of the shape of leaves. We have found that circadian clock also has some effects on the control of leaf shape and length. Mutations in two clock genes LHY and CCA1 (lhy;cca1) change flowering time and lengths of hypocotyls and petioles. Under continuous light (LL), the lhy;cca1 plants have late flowering and semi-dwarf phenotypes (Fujiwara et al., Plant Cell 2008). To understand molecular mechanisms underlying these phenotypes, we have isolated 7 enhancers (petanko 1-7; pta1-7) and 4 suppressors of the phenotypes of lhy;cca1 under LL. The pta5 was mapped to the lower side of Ch3. We will discuss possible roles of PTA5 in the control of flowering time and organ elongation with LHY/CCA1.
