..................................................
Fig. 1. Shoot apical meristem organization and leaf development. (A) Drawing of an Arabidopsis thaliana median longitudinal histological section of the SAM with the different zones (FLM, flank meristem; CIZ, central initiation zone; CLZ, cambium-like zone; FIM, file meristem) (according to Vaughan, 1952). (B) Microsurgical incisions, represented by the white lines, in the potato SAM (top view) have an effect on the symmetry of the next leaf primordium (I1) to be formed (according to Sussex, 1955). (C) Paradermal section through an expanding Arabidopsis thaliana leaf lamina showing gradients of cell division at the basal zone and cell expansion at the tip (according to Pyke et al., 1991).
..................................................
Fig. 2. Developmental phenotypes of the drl1-2 mutant affected in the DRL1 gene that is a putative regulator of the plant Elongator histone acetyltransferase complex. (A,B) Full grown rosettes of wild type, resp. drl1-2. (C) Primary root growth kinetics. (D,E) Inflorescence architecture of wild type, resp. drl1-2. (F,G) Scanning electron micrograph of a wild type, resp. drl1-2 SAM. (H,I) Longitudinal section through a 6-day-old shoot apex of wild type, resp. drl1-2. (J,K) Transverse section through 12-dayold shoot apices of wild type, resp. drl1-2 (according to Nelissen et al., 2003). Asterisks indicate the SAM. c, cotelydon; DAG, days after germination; hy, hypocotyls; p, leaf primordium; p1 to p4, first to fourth leaf primordium; Bar in F,G = 25 μm; in H to K, 50 μm.
..................................................
Fig. 3. Homeotic flower mutants. (A) Wild-type Arabidopsis thaliana flower. (B) Arabidopsis agamous c- mutant (according to Yanofsky et al., 1991). (C) Arabidopsis a-b-c- triple mutant (according to Weigel and Meyerowitz, 1994).
..................................................
Source: Int. J. Dev. Biol. 49: 453-465 (2005)
Answers to all your Biology Questions
