Mathematical model studies of the comprehensive generation of major and minor phyllotactic patterns in plants with a predominant focus on orixate phyllotaxis
Fig 4
Orixate phyllotaxis in the apical winter buds of Orixa japonica.
(A) Transverse section. O points to the summit of the SAM, and leaf primordia are designated as P1, P2, P3, etc., with P1 being the youngest visible primordium. Black lines represent orthostichies drawn by joining the gravity centers of leaf primorida and O. The four orthostichy lines can be roughly approximated by two orthogonal lines (pale gray broad lines). (B) Longitudinal section. I1 indicates the incipient primordium. (C) Scanning electron microscopic image. (D) Divergence angles measured using the transverse sections. Divergence angles close to 180° show opposite positioning of the successive primordia (blue), while angles near 90° or 270° show adjacent positioning (yellow). (E) The natural logs of plastochron ratios OP2/OP1 and OP3/OP2 are plotted based on whether the two primordia are located in an adjacent or opposite position. In (D) and (E), points linked by a line represent data from the same sample, and red points indicate data obtained from the section of (A).