Endochitinase and beta-1,3-glucanase genes are developmentally regulated during somatic embryogenesis in Picea glauca

aba adn arn biological development cell walls champignon chitinase cotiledones cotyledons desarrollo embrionario dna embriones vegetales embryon somatique embryonic development enzimas enzyme enzymes estres feuille fungi gene gene expression genes glicosidasas glycosidase glycosidases hojas hongos leaves leptosphaeria maculans pared celular paroi cellulaire picea glauca plant embryos plant tissues quitinasa rna somatic embryos somatische embryogenese stress tejidos vegetales