光质对灵芝菌丝体生长及内源IAA代谢调控的研究

采用新型LED冷光源设置不同光质条件,动态观测灵芝菌丝体生长、内源IAA含量和其相关酶活性变化及多糖积累情况,研究光质对灵芝菌丝体生长、内源IAA水平及活性成分积累的影响,揭示光质作用于灵芝的效应及机制,为灵芝菌丝体培养提供科学的理论依据.研究发现,蓝光处理菌丝体生长稳定,多糖含量明显高于其他处理,综合优势明显;红光处理在灵芝菌丝体生长前期能显著提高其内源IAA水平,加快其生长;绿光处理菌丝体生长缓慢,鲜重少,但其折干率大.不同光质对灵芝菌丝体IAA代谢相关酶活性有显著影响:蓝光处理灵芝菌丝体IAA含量始终处于较低水平,其吲哚乙酸氧化酶(IAAO)、过氧化物酶(POD)以及色氨酸合成酶活性变化均为前期高而中后期低;黄光处理菌丝体IAA含量居中,但其IAAO、色氨酸合成酶活性最大.结果表明不同光质影响灵芝菌丝体生长,同时对其内源IAA水平也有显著影响.

Light quality regulation of growth and endogenous IAA metabolism of Ganoderma lucidum mycelium

To study the effect and mechanism of the light quality acting on Ganoderma lucidum, and provide a theoretical basis for G. lucidum mycelium cultivation, we focused on growth and endogenous IAA metabolism of G. lucidum mycelium under different light-emitting diode (LED) condition. The growth index, endogenous levels of IAA and Enzymes related to IAA metabolism and Polysaccharides content were investigated in different growth periods. Results showed that blue light irradiation was the best from the viewpoint of steady growth and polysaccharides accumulation,red light irradiation improved endogenous IAA level and promoted growth of mycelium in early stage of cultivation, green light irradiation decreased growth rate and fresh weight of mycelium, but increased drying rate. Enzymes related to IAA metabolism also significantly influenced by light quality. The activity of indole acetic acid oxidase (IAAO), peroxidase (POD) and tryptophan synthetase with blue light irradiation were showed high level in early time, but decreased later, and the IAA content was consistently at lower level than that in other treatments, while mycelium irradiated with yellow light showed the highest activity of both IAAO and tryptophan synthetase,and medium level of IAA content. In conclusion, the light quality affects growth and regulation of the level of endogenous IAA of G. lucidum mycelium.