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International Journal of Medicinal Mushrooms
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ISSN 印刷: 1521-9437
ISSN オンライン: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.v16.i4.60
pages 355-364

Characterization of Interspecific Hybrid Dikaryons of the Oyster Mushrooms, Pleurotus florida PAU-5 and P. sajor-caju PAU-3 (Higher Basidiomycetes) from India

Ravinder Kumar Jaswal
Department of Microbiology, Punjab Agricultural University, Ludhiana, Punjab, India
Harpreet Singh Sodhi
Department of Microbiology, College of Basic Sciences and Humanities, Punjab Agricultural University, Ludhiana, Punjab, India
Shivani Sharma
Department of Microbiology, Punjab Agricultural University, Ludhiana, Punjab, India 141 004

要約

Five Pleurotus hybrid dikaryons, developed through cross-breeding of P. florida PAU-5 (PF-5) and P. sajor-caju PAU-3 (PSC-3) were characterized with respect to textural properties, color, and enzymatic and genetic variability. Texture profile revealed significant differences in springiness, resilience, cohesiveness, and chewiness between all hybrids compared to the parents. Among the hybrid cultures, maximum whiteness was reported in hybrid 37, whereas hybrid 8 had minimum whiteness. Three hybrids (16, 37, 42) showed an increased linear growth rate in relation to PF-5, whereas no hybrid showed a higher growth rate than PSC-3. Maximum endoglucanase and xylanase activity was observed in hybrid 46, whereas minimum activity occurred in hybrid 42. Laccase and protease activity was higher in hybrid 37 and 46, respectively. Four hybrids (16, 37, 42, 46) showed increased peroxidase activity in relation to PF-5, whereas hybrid 46 showed activity higher than the parent PSC-3. Comparison of isozyme patterns confirmed the hybrid nature of hybrid 16. The large variation in the intensity of bands could be a result of recombination. Sodium dodecyl sulfate polyacrylamide gel electrophoresis of extracellular enzymes revealed 60.3- and 43-KDa bands in all the hybrids. An additional 25-KDa band was reported in hybrids 37, 42, and 46 and the parent PF-5, indicating their close relatedness. Parental strains showed higher divergence in small-subunit ribosomal DNA region compared with the internal transcribed spacer region, indicating their significance in varietal discrimination. Hybrid 46 had a small-subunit ribosomal DNA region more similar to that of PSC-3 compared with PF-5, whereas the internal transcribed spacer region of hybrids 42 and 46 revealed close resemblance to that of PF-5 and PSC-3, respectively.


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