ABSTRACT
Agrocybe cylandracea es un hongo que se consume en el municipio de Técpan Guatemala, Chimaltennago, San Juan Ostuncalco, Quetzaltenango y las aldeas Escuachil y Vista Hermosa de San Antonio Sacatepéquez, San Marcos. En la presente investigación se utilizaron cinco cepas guatemaltecas de A. cylindracea determinándose la morfología colonial y el crecimiento micelial en diferentes medios de cultivo y pH, para obtener la mejor condición en su cultivo a nivel de laboratorio como paso previo a la obtención de biomasa fúngica, producción de inóculo y cuerpos fructíferos. Se determinó que todas las colonias de las cepas evaluadas mostraron las características morfológicas reportadas en la literatura para A. cylandracea (con excepción de la cantidad de micelio aéreo el cual fue abundante) en todos los medios y pH estudiados...
Subject(s)
Agrocybe , Hydrogen-Ion Concentration , MyceliumABSTRACT
This study evaluated the optimal vegetative growth conditions and molecular phylogenetic relationships of eleven strains of Agrocybe cylindracea collected from different ecological regions of Korea, China and Taiwan. The optimal temperature and pH for mycelial growth were observed at 25degrees C and 6. Potato dextrose agar and Hennerberg were the favorable media for vegetative growth, whereas glucose tryptone was unfavorable. Dextrin, maltose, and fructose were the most effective carbon sources. The most suitable nitrogen sources were arginine and glycine, whereas methionine, alanine, histidine, and urea were least effective for the mycelial propagation of A. cylindracea. The internal transcribed spacer (ITS) regions of rDNA were amplified using PCR. The sequence of ITS2 was more variable than that of ITS1, while the 5.8S sequences were identical. The reciprocal homologies of the ITS sequences ranged from 98 to 100%. The strains were also analyzed by random amplification of polymorphic DNA (RAPD) using 20 arbitrary primers. Fifteen primers efficiently amplified the genomic DNA. The average number of polymorphic bands observed per primer was 3.8. The numbers of amplified bands varied based on the primers and strains, with polymorphic fragments ranging from 0.1 to 2.9 kb. The results of RAPD analysis were similar to the ITS region sequences. The results revealed that RAPD and ITS techniques were well suited for detecting the genetic diversity of all A. cylindracea strains tested.
Subject(s)
Agar , Agrocybe , Alanine , Arginine , Carbon , China , DNA , DNA, Ribosomal , Fructose , Genetic Variation , Glucose , Glycine , Histidine , Hydrogen-Ion Concentration , Korea , Maltose , Methionine , Nitrogen , Polymerase Chain Reaction , Solanum tuberosum , Taiwan , UreaABSTRACT
Agrocybe cylindracea, an edible mushroom belonging to Bolbitiaceae, Agaricales, is widely used as invaluable medicinal material in the oriental countries. This study was initiated to find the genes expressed during the fruiting body formation of A. cylindracea. The cDNAs expressed differentially during fruiting body morphogenesis of A. cylindracea were isolated through subtractive hybridization between vegetative mycelia and fruiting bodies. The cDNAs expressed in the fruiting body morphogenesis of A. cylindracea were cloned and twenty genes were identified. Eleven were homologous to genes of known functions, three were homologous to genes in other organism without any function known. Six were completely novel genes specific to A. cylindracea so far examined. Some genes with known functions were a pleurotolysin, a self-assembling poreforming cytolysins; Aa-Pri1 and Pir2p, specifically induced genes during fruiting initiation of other mushroom, Agrocybe aegerita; an amino acid permease; a cytochrome P450; a MADS-box gene; a peptidylprolyl isomerase; and a serine proteinase. For other clones, no clear function was annotated so far. We believe the first report of the differentially expressed genes in fruiting process of A. cylindracea will be great helps for further research.
Subject(s)
Agaricales , Agrocybe , Amino Acid Transport Systems , Clone Cells , Cytochrome P-450 Enzyme System , Cytotoxins , DNA, Complementary , Fruit , Gene Expression , Morphogenesis , Peptidylprolyl Isomerase , Perforin , Serine ProteasesABSTRACT
[Objective] To measure the nitrogen content in Agrocybe cylindracea R.Maire,compare the advantages of Kai's Nitrogen-testing method and Spectrophotometric method.[Method]Take Kai's Nitrogen-testing method and Spectrophotometric method.[Result]The two methods were almost the same in the measurement of nitrogen,i.e.30.70mg/g,which had no marked difference by t test.[Conclusion]Spectrophotometric method is simple and convenient for operation,quickly and correctly,and can be used for measurement of total nitrogen.