Britz H, Wingfield MJ, Coutinho TA, Marasas WFO, Leslie JF
Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein 9300, South Africa.
Appl Environ Microbiol. 1998 Jun;64(6):2094-5. doi: 10.1128/AEM.64.6.2094-2095.1998.
Fusarium subglutinans f. sp. pini is the causal agent of pitch canker disease of pines. The initial occurrence of F. subglutinans f. sp. pini in South Africa was limited to a single nursery, and isolates from this population are capable of reproducing sexually. We determined the effective population number, Ne, of this population by using mating type and male/hermaphrodite polymorphisms as indicators. The effective population number for mating type, Ne(mt), is 99% of the count (total population), and that for male/hermaphrodite status, Ne(f), is 42 to 46% of the count (total population). The number of strains that can function as the female parent limits the effective population number of this population. If this population is stable, then, depending upon assumptions about mutation and selection, sexual reproduction need occur only once per 26 to 153 asexual generations to maintain this level of sexual fertility.
亚粘团镰孢松专化型是松树树脂溃疡病的病原菌。亚粘团镰孢松专化型在南非最初仅出现在一个苗圃中，且该群体的分离株能够进行有性繁殖。我们以交配型和雄性/雌雄同体多态性为指标，确定了该群体的有效种群数量Ne。交配型的有效种群数量Ne(mt)为计数（种群总数）的99%，而雄性/雌雄同体状态的有效种群数量Ne(f)为计数（种群总数）的42%至46%。能够作为母本的菌株数量限制了该群体的有效种群数量。如果该群体稳定，那么，根据关于突变和选择的假设，有性繁殖仅需每26至153个无性世代发生一次，就能维持这种有性繁殖力水平。
