The ultrastructure of polymorphic pollen grains of Canna indica L. |
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Authors: | F. Chen F. Ciampolini A. Tiezzi M. Cresti |
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Affiliation: | (1) Dipartimento di Biologia Ambientale, Sezione Botanica, Università di Siena, Via P.A. Mattioli, 4, I-53100 Siena, Italy;(2) Present address: Biology Department, Sichuan University, Chengdu, People's Republic of China |
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Abstract: | Summary Our investigations on Canna indica L. indicate that the pollen of this species is polymorphic: there are two types of pollen — a larger type and a comparatively smaller type. Transmission electron microscopy (TEM) revealed the presence of small vacuoles containing tannic substances in the generative cell (GC) of the larger grains: the GC of the mature grain contained a higher quantity of tannins than the GC of the immature grain. Mitochondria, lipid bodies, rough endoplasmic reticulum (RER) and microtubular bundles were present in the cytoplasm of the GC. Numerous mitochondria, lipid bodies and plastids were also present in the vegetative cell (VC), with the mitochondria clustered around the vegetative nucleus. The plastids were observed to be associated with the RER cisterns. During the maturation process, the number of starch grains contained in the plastids decreased. |
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Keywords: | Polymorphism Ultrastructure Pollen grains Canna indica L Tannin |
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