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Effects of low temperature (3°C for 48h) on microspores (n) and on parenchymatous somatic tissue (2n) of anthers of D. metel have been studied. The general pattern of ultrastructural changes in microspores and parenchymatous cells differ despite some similarity in the initial sites of low temperature action on vacuolization of the cytoplasm. The cold stress modifications are more marked in somatic tissues than in the microspores. The general cold-stress responses are: vacuolization and loss of cytoplasmic structure, disorganisation of organelles, darkening of cell wall and apparent loss of turgor pressure. The starch grains in the plastids begin to disappear or to reduce in size when the chilling stress is applied. Periodic structures appear in the vacuole and the first intine of the androgenic microspores. Apparent modifications are also observed in plastids, mitochondria, nuclei and plasma membrane. The significance of these structural changes in relation to androgenesis is discussed.

Cold-treatment related structural modifications in the embryogenic anthers of Datura.