Genetic Diversity Among Strains of Pleurotus species (oyster mushroom) Using Morphometric Traits Under Varied Temperature and pH

E. Adebayo, M. A. Azeez, O. N. Majolagbe, J. Oloke
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Abstract

Abstract Genetic diversity in nineteen strains of Pleurotus was studied using morphometric traits and growth factors. Ability of the isolates of these strains to tolerate different ranges of temperature and pH were evaluated. Highest mycelial growth rates were obtained at 25 °C (mutants and hybrids) and 30 °C (wild type), while LAU 90 (mutant) performed satisfactorily at all evaluated temperature ranges (15-35 °C). Highest mycelial yields (dry weight) were produced by LAU 90 at different pH regimes (4.0 - 9.0), while hybrids LN 97 and LN 98 maximally produced mycelial yield at pH 5.0 and 7.0, respectively. Analysis od Principal component (PC) revealed that components of these strains accounted for 86.1% of total variations among the strains with first PC recording 44.6%. The dendrogram discriminated nineteen Pleurotus genotypes into two major genetic groups with mutants and hybrid strains in Cluster A, separated distinctly from wild parents in Cluster B, indicating genetic diversity. The expression of heterosis can be maximized by information obtained among the hybrid strains and mutant (LAU90) strain. The hybrid (LN98) strain with superior performance may be selected for adoption in commercial mushroom production.
不同温度和pH下平菇种(平菇)形态特征的遗传多样性
摘要采用形态计量学和生长因子对19个侧耳菇品系的遗传多样性进行了研究。对这些菌株的分离株对不同温度和pH值的耐受能力进行了评价。在25°C(突变体和杂交种)和30°C(野生型)下获得最高的菌丝生长速率,而LAU 90(突变体)在所有评估的温度范围(15-35°C)下均表现令人满意。不同pH(4.0 ~ 9.0)条件下,la90菌丝产量(干重)最高,而l97和l98在pH 5.0和7.0条件下菌丝产量最高。主成分分析表明,这些菌株的主成分占总变异的86.1%,其中首株主成分占44.6%。树形图将19个侧耳菇基因型区分为突变株和杂交株两大遗传群,与野生亲本在B群中有明显的分离,表明遗传多样性。杂交株系与突变株系(LAU90)之间获得的信息可以最大限度地发挥杂种优势的表达。该杂种菌株LN98具有优良的生产性能,可用于商业化生产。
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