Vol. 71 No: 5

Title:
Ultrastructural Changes in the Apical Meristem of Liatris Spicata cv. Callilepis During Dormancy Breaking

Authors:
S. BAÑÓN, J.A. FERNÁNDEZ, A. ORTUÑO and J.A. DEL RÍO

pp: 777-784

Abstract:
Electron-microscopic studies of the apical meristem in corms of liatris (Liatris spicata(L.) Willd.) aimed to ascertain whether any structural changes were initiated during the breaking of dormancy. The ultrastructure of the cells examined in dormant corms shows many vacuoles with abundant dispersed electron-dense material. Different types of plastids are observed: eoplasts, amyloplasts and etioplasts. These organelles proliferate at the beginning of dormancy release (after five weeks at a low temperatures) and the vacuolar contents tend to unite to form large lipid-protein bodies. Soon after the breaking of dormancy (after nine weeks of low temperatures) the plastids cease to proliferate and they appear homogeneous. These results suggest that the sequence of reactions involved in dormancy breaking may be closely related to plastid proliferation.

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