caa a22 4500 477053254 CHVBK 20180405111343.0 cr unu---uuuuu 170330e19960501xx s 000 0 eng 10.1007/BF02221398 doi (NATIONALLICENCE)springer-10.1007/BF02221398 Fertilization and rejection of spermatozoids by egg cells in artificially pollinated ovules of Encephalartos (Zamiaceae) [Elektronische Daten] [Elsie Steyn, W. Strydom, Antoinette Botha] The structure and behaviour of free female, male and proembryonal nuclei ofEncephalartos villosus Lem. were studied during a light-microscopical investigation of serially sectioned archegonia in successfully pollinated ovules. Before spermatozoids were released from the pollen tubes into the archegonial chamber, the ventral canal nucleus had disintegrated in the neck region of the egg cell among minute, amoeboid bodies with PAS-positive granules. In archegonia containing multiple spermatozoids, the egg nucleus was unobtrusive and syngamy followed by proembryo formation regularly resulted. The egg cell usually reacted violently in archegonia penetrated by a single spermatozoid. These reactions were regarded as rejection phenomena and considered as indicators that the egg cell can differentiate between compatible and incompatible male gametes. Springer-Verlag, 1996 Cycads nationallicence Encephalartos nationallicence Female choice nationallicence Fertilization nationallicence Prezygotic recognition nationallicence Steyn Elsie National Botanical Institute, Private Bag X101, 0001, Pretoria, Republic of South Africa aut Strydom W. National Botanical Institute, Private Bag X101, 0001, Pretoria, Republic of South Africa aut Botha Antoinette National Botanical Institute, Private Bag X101, 0001, Pretoria, Republic of South Africa aut Sexual Plant Reproduction Springer-Verlag 9/3(1996-05-01), 175-185 0934-0882 9:3<175 1996 9 497 https://doi.org/10.1007/BF02221398 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02221398 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Steyn Elsie National Botanical Institute, Private Bag X101, 0001, Pretoria, Republic of South Africa aut NATIONALLICENCE 700 1- Strydom W. National Botanical Institute, Private Bag X101, 0001, Pretoria, Republic of South Africa aut NATIONALLICENCE 700 1- Botha Antoinette National Botanical Institute, Private Bag X101, 0001, Pretoria, Republic of South Africa aut NATIONALLICENCE 773 0- Sexual Plant Reproduction Springer-Verlag 9/3(1996-05-01), 175-185 0934-0882 9:3<175 1996 9 497 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer