Environmental factors modify carbon nutritional patterns and niche overlap between Aspergillus flavus and Fusarium verticillioides strains from maize
Environmental factors modify carbon nutritional patterns and niche overlap between Aspergillus flavus and Fusarium verticillioides strains from maize
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DOI：
10.1016/j.ijfoodmicro.2009.01.032
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发表时间：
2009-04-15
影响因子：
5.4
通讯作者：
Battilani, Paola
中科院分区：
文献类型：
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作者：
Giorni, Paola;Magan, Naresh;Battilani, Paola
本研究研究了不同水分活度(a（w), 0.87-0.98 a(w)）和温度（20-35℃）下黄曲霉和黄萎病镰刀菌对玉米关键碳源（CS， 24：包括关键糖、氨基酸和脂肪酸）的利用模式，并比较了生态位重叠指数（NO1）对体外碳源利用情况的估计[Wilson， M., Lindow， S.E,1994]。通过营养资源分配介导的附生细菌种群共存。应用与环境微生物学[j]., 2016, 44(4): 668 - 677。研究了这些关键CS在最小培养基中的生长能力，分12个步骤培养120h。计算了种间（F verticillioides-A）的NO1。A. flavus)和种内(A. flavus-A.；有利于在相互作用的环境条件范围内使用CS利用模式。研究发现，在整个温度范围内，30℃对褐霉的最大CS数量的利用是最优的。相反，对于F. verticillioides，这在20℃时更为明显；25c允许两个物种对CS的次优使用。NOls证实了30℃条件下蚕豆芽孢杆菌（a. favus）的营养优势，特别是在较低水平；20℃条件下黄萎病芽孢杆菌（F. verticillioides）的营养优势，主要在0.95 a(w)。在其他生境条件下，基于CS利用模式的数据表明，黄花拟南芥和黄花拟南芥占据不同的生态位。不同菌株对营养源利用的差异与它们产生黄曲霉毒素的能力无关。这类数据有助于解释真菌种类和菌株在不同环境条件下的营养优势。这可能有助于寻找合适的天然生物防治微生物来与这些产生真菌毒素的物种竞争。(C) 2009 Elsevier B.V.版权所有
This study examined the utilization patterns of key carbon sources (CS, 24: including key sugars, amino acids and fatty acids) in maize by strains of Aspergillus flavus and Fusarium verticillioides under different water activity (a(w), 0.87-0.98 a(w)) and temperature (20-35 degrees C) values and compared the niche overlap indices (NO1) that estimate the in vitro CS utilization profiles [Wilson, M., Lindow, S.E.,1994. Coexistence among epiphytic bacterial populations mediated through nutritional resource partitioning. Applied and Environmental Microbiology 60, 4468-4477.]. The ability to grow in these key CS in minimal media was studied for 120h in 12 h steps. The NO1 was calculated for inter-species (F verticillioides-A. flavus) and for intra-species (A. flavus-A. favus) using CS utilization patterns over the range of interacting environmental conditions. 30 C, over the whole aw range examined, was found to be optimal for utilization of the maximum number of CS by A. favus. In contrast, for F. verticillioides this was more so at 20 C; 25 C allowed a suboptimal usage of CS for both species. NOls confirmed the nutritional dominance of A. favus at 30 C, especially at lower a. levels and that of F. verticillioides at 20 degrees C, mainly at 0.95 a(w). In other conditions of a(w) based on CS utilization patterns, the data indicated that A. favus and F. verticillioides occupied different ecological niches. The variability in nutritional sources utilization between A. favus strains was not related to their ability to produce aflatoxins (AFs). This type of data helps to explain the nutritional dominance of fungal species and strains under different environmental conditions. This could be useful in trying to find appropriate natural biocontrol microorganisms to compete with these mycotoxigenic species. (C) 2009 Elsevier B.V. All rights reserved.