Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 64, Issue 50, Pages 9506-9514Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b04056
Keywords
light; Monascus ruber; citrinin; pigment; biomass
Funding
- Major Program of National Natural Science Foundation of China [31330059]
- National Natural Science Foundation of China [31271834, 31171649, 31371824, 31401631]
- Fundamental Research Funds for the Central Universities [2662014PY034, 2662014BQ051, 2662015QC003, 2662016PY130]
- Tarim University [TDHNLH201602]
- Huazhong Agricultural University [TDHNLH201602]
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Light is a crucial environmental signal for fungi. In this work, the effects of different light intensities and colors on biomass, Monascus pigments (MPs) and citrinin production of Monascus ruber M7 were investigated. We have demonstrated that low intensity of blue light (500 lx) decreased Monascus biomass, increased MPs accumulation via upregulation of MpigA, MpigB, and MpigJ genes expression, but had no significant influence on citrinin production. High intensity of blue light (1500 lx) decreased citrinin accumulation but had no significant influence on biomass and MPs production after 14 days cultivation. Low intensity of green light (500 lx) stimulated citrinin production via upregulation of pksCT, mrl1, mrl2, and ctnA genes expression. One putative red light photoreceptor and two putative green light photoreceptors were identified in M. ruber M7. These observations will not only guide the practical production of Monascus but also contribute to our understanding light effects on Monascus.
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