1989
DOI: 10.1016/s0953-7562(89)80192-3
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Nuclear changes in Phytophthora during oospore maturation and germination

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Cited by 13 publications
(11 citation statements)
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“…Fusion of nuclei and achievement of a definitive structure, together with germination capability, are particular characteristics of type II oospores. Sporangium formation by type II oospores supports the hypothesis of Jiang et al (1989) that the presence of a single nucleus in oospores of Phytophthora spp. is an indispensable prerequisite for germination and that the fusion of gametangial nuclei is a useful criterion to distinguish mature oospores.…”
Section: Discussionsupporting
confidence: 80%
See 1 more Smart Citation
“…Fusion of nuclei and achievement of a definitive structure, together with germination capability, are particular characteristics of type II oospores. Sporangium formation by type II oospores supports the hypothesis of Jiang et al (1989) that the presence of a single nucleus in oospores of Phytophthora spp. is an indispensable prerequisite for germination and that the fusion of gametangial nuclei is a useful criterion to distinguish mature oospores.…”
Section: Discussionsupporting
confidence: 80%
“…Abnormal oospore structure and no discernible nuclei have already been associated, respectively, with scarce viability and absence of germination (Beakes et al, 1986 ;Jiang et al, 1989). It can, therefore, be assumed that type III oospores represent dead or degenerating P. viticola overwintering structures.…”
Section: Discussionmentioning
confidence: 99%
“…Gametangial pre-meiotic or post-zygotic nuclei are mostly diploid although partial polyploids and polyploids have been identified in Phytophthora (Brasier & Sansome, 1975 ;Sansome, 1987 ;Shaw, 1991 ;Brasier, 1992). Oospores with more than two pre-zygotic nuclei appear unable to germinate and therefore are non-functional propagules (Jiang et al, 1989). In our study, entry of other nuclei once fertilization had occurred appeared to be prevented by some mechanism possibly controlled by the fertilized oosphere or oogonium.…”
Section: Discussionmentioning
confidence: 48%
“…Oospore ontogeny indicated that one antheridial and one oogonial nucleus were involved in oospore development although, more than one nucleus was present in some fertilization tubes and more than one fertilization tube penetrated some oogonia. Other investigations of oospore development in Phytophthora also have indicated that two nuclei capable of fusion are required for functional oospore development (Brasier & Sansome, 1975 ;Brasier & Brasier, 1978 ;Jiang et al, 1989). Pre-zygotic nuclei are usually haploid but this needs to be confirmed by unequivocal genetic analysis (Shaw, 1991 ;Brasier, 1992).…”
Section: Discussionmentioning
confidence: 99%
“…The difference observed between the number of presumed viable oospores (MTT and morphology) and the effective number of P. ramorum viable progenies might be the result of 'nucleus incompatibility' during nuclear fusion in the oospore leading to abortion. Indeed, as previously demonstrated for different Phytophthora species, haploid nucleus from antheridia and oogonia are separated during the dormancy and their fusion occurs during the first steps prior the germination (Jiang et al 1989). This 'nucleus incompatibility' could be the result of chromosomal aberrations during meiosis in gametangia or expression of lethal mutations during the germination (Brasier & Sansome 1975).…”
Section: Discussionmentioning
confidence: 57%