L-System model for the growth of arbuscular mycorrhizal fungi, both within and outside of their host roots
L-System model for the growth of arbuscular mycorrhizal fungi, both within and outside of their host roots
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用于丛枝菌根真菌在宿主根内部和外部生长的 L 系统模型
DOI：
10.1098/rsif.2016.0129
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发表时间：
2016
影响因子：
3.9
通讯作者：
J. Jansa
中科院分区：
文献类型：
--
作者：
A. Schnepf;D. Leitner;P. Schweiger;P. Scholl;J. Jansa
丛枝菌根真菌在根系和周围土壤中的定殖是菌根共生的中心过程，对于生态系统功能和商业接种物应用是重要的。为了提高这一高度空间和暂时的动态过程的机械理解，我们开发了一个三维模型，考虑到根和菌丝的生长。这是第一次，根系内的感染是动态模拟，并在空间上解决的方式。标定实验中的测量数据和模拟结果之间的比较表明，良好的拟合。我们的模拟表明，真菌接种物的位置影响菌丝生长参数的敏感性。二次感染的速度和菌丝寿命的变化有不同的影响根感染和菌丝长度，分别取决于接种物是集中或分散。对于其他参数（分支率、入口点之间的距离），相对效应相同，与接种物放置无关。该模型还表明，最大根定植水平远低于100%，经常观察到的实验，可能是由于差异蔓延的根和菌丝，除了内在的植物控制，特别是在局部放置接种物和缓慢的二次感染。
Development of arbuscular mycorrhizal fungal colonization of roots and the surrounding soil is the central process of mycorrhizal symbiosis, important for ecosystem functioning and commercial inoculum applications. To improve mechanistic understanding of this highly spatially and temporarily dynamic process, we developed a three-dimensional model taking into account growth of the roots and hyphae. It is for the first time that infection within the root system is simulated dynamically and in a spatially resolved way. Comparison between data measured in a calibration experiment and simulated results showed a good fit. Our simulations showed that the position of the fungal inoculum affects the sensitivity of hyphal growth parameters. Variation in speed of secondary infection and hyphal lifetime had a different effect on root infection and hyphal length, respectively, depending on whether the inoculum was concentrated or dispersed. For other parameters (branching rate, distance between entry points), the relative effect was the same independent of inoculum placement. The model also indicated that maximum root colonization levels well below 100%, often observed experimentally, may be a result of differential spread of roots and hyphae, besides intrinsic plant control, particularly upon localized placement of inoculum and slow secondary infection.