QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

Help viewing high resolution images Return to article

Fig. 7. Partial isolation of the site of incipient leaf formation (I₁), or of the youngest primordium (P₁), from the meristem by a superficial incision leads to defects in dorsoventral patterning of the isolated primordium. (A) Tomato apex immediately after isolation of I₁ by an ablation of the superficial L₁ layer (black arrowheads). (B) Semi-thin section of a tomato apex immediately after isolation of P₁ by an ablation as in A (black arrowhead). (C) Tomato apex 8 days after isolation of P₁ as described in A. P₁ lacks any sign of leaflets or of a developing leaf blade. The trichomes exhibit only abaxial features (compare with Fig. 5A). (D-I) Tomato apices 8 days after operation as in A. (D) P₁ lacks leaflets but has developed a leaf blade (white arrowheads). (E) Close up view of D. Note the lack of leaflets in P₁, compared with I₁ (white arrowheads). (F) P₁ exhibits only one pair of leaflets, compared with I₁, which has already formed two pairs of leaflets (white arrowheads). (G) I₁ is retarded and lacks any sign of dorsoventral patterning. (H) Completely radialized I₁ of approximately normal size. (I) Initiation of an accessory meristem (white arrowhead) above the operated I₁ position. P₄, P₃ and P₂ indicate the bases of pre-existing leaf primordia that were removed at the beginning of the experiment, and P₁ represents the youngest primordium; I₁ indicates the first primordium formed after the ablation. Scale bar: 200 µm.

Return to article