Photostimulation of Hypocrea atroviridis growth occurs due to a cross-talk of carbon metabolism, blue light receptors and response to oxidative stress
Photostimulation of Hypocrea atroviridis growth occurs due to a cross-talk of carbon metabolism, blue light receptors and response to oxidative stress
复制标题
DOI：
10.1099/mic.0.2007/014175-0
复制
发表时间：
2008-04-01
期刊：
影响因子：
2.8
通讯作者：
Druzhinina, Irina S.
中科院分区：
文献类型：
--
作者：
Friedl, Martina A.;Schmoll, Monika;Druzhinina, Irina S.
光是一种基本的非生物因素，它刺激大多数生物体的生长和发育。在土壤腐养真菌中，光主要影响形态发生，特别是有性和无性孢子的形成。在这里，我们提出了一个新的功能，光，菌丝生长的增强。光刺激的菌丝生长的土壤真菌肉座菌atroviridis检测17（95个测试碳源）碳水化合物和多元醇，这是代谢相关的纤维素和半纤维素，主要是在上层土壤凋落物层。这种刺激分别取决于两种蓝光受体蛋白BLIR-1和BLR-2的功能，BLR-1负责碳源选择性和对持久光的响应。在黑暗中引起的氧化应激反应模仿这些碳源的光刺激，这种效果是完全依赖于BLR-1的功能。我们的结论是，光与特定的碳源的可用性相结合，作为一个信号的真菌在地面上，从而刺激快速增长，以产生最大的繁殖体在最短的时间。我们进一步推断，这一过程涉及氧化应激反应和两个蓝光受体蛋白BLR-1和BLR-2，前者发挥主要作用。
Light is a fundamental abiotic factor which stimulates growth and development of the majority of living organisms. In soil saprotrophic fungi, light is primarily known to influence morphogenesis, particularly sexual and asexual spore formation. Here we present a new function of light, the enhancement of mycelial growth. The photostimulated mycelial growth of the soil fungus Hypocrea atroviridis was detected on 17 (out of 95 tested carbon sources) carbohydrates and polyols, which are metabolically related to cellulose and hemicelluloses, and which are mainly available in the upper soil litter layer. This stimulation depends differently on the function of the two blue light receptor proteins BLIR-1 and BLR-2, respectively, BLR-1 being responsible for carbon source selectivity and response to permanent light. Evocation of oxidative stress response in darkness imitates the photostimulation on nine of these carbon sources, and this effect was fully dependent on the function of BLR-1. We conclude that light in combination with the availability of litter-specific carbon sources serves as a signal for the fungus to be above ground, thereby stimulating fast growth in order to produce a maximum of propagules in the shortest time. We further deduce that this process involves oxidative stress response and the two blue light receptor proteins BLR-1 and BLR-2, the former playing the major role.