Fig. 2
From: An optimized histological proceeding to study the female gametophyte development in grapevine
Longitudinal sections of Sangiovese ovules at stage E-L 15. Magnifications: 400Ă— in A, C and D, 1000Ă— in B. In A and B the empty space in the archeospore (a) in the central part of the nucellus (Nu) shows the process during metaphase of mitotic division of the archeospore (a) which will produce an outer primary parietal cell and an inner primary megasporogenous cell. In C the archeospore (a), in the central part of the nucellus (Nu), is the largest cell with a little darker area. Initiation of the inner integument (black arrow), dividing cells (^) indicating signs of initiation of the outer integument formation (dotted arrow)