Mutualism effectiveness and vertical transmission of symbiotic fungal endophytes in response to host genetic background.
Mutualism effectiveness and vertical transmission of symbiotic fungal endophytes in response to host genetic background.
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DOI：
10.1111/j.1752-4571.2012.00261.x
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发表时间：
2012-12
影响因子：
4.1
通讯作者：
Ghersa CM
中科院分区：
文献类型：
--
作者：
Gundel PE;Martínez-Ghersa MA;Omacini M;Cuyeu R;Pagano E;Ríos R;Ghersa CM
某些种类的早熟禾亚科通过与垂直传播的无性真菌共生而发展出抗逆性和抗草食性。这种共生是特定的，遗传因素调节伴侣之间的相容性。虽然基因流显然是异花受精草的一个适应性特征，但因为它注入了杂种活力和进化的原料，它可能会降低相容性，从而降低互利共生的有效性。为了探讨宿主遗传背景在调节共生性能中的重要性，将多花黑麦草植株（感染和未感染Neotyphodium occultans）与从两个品种繁殖的等株系（敏感和抗禾草灵除草剂）的遗传远缘植株杂交，并暴露于胁迫下。内生菌提高了对除草剂敏感的基因型的幼苗存活率，而它对遗传抗性杂交种之一有负面影响。互利共生提供了独立的宿主基因型的草食动物的阻力，但这种影响消失的压力。虽然没有观察到内生菌对宿主繁殖成功的影响，但它通过种群间植物杂交而增加。无论是基因流还是除草剂对内生菌的传播都没有重要影响。宿主适应性的改善归因于基因流似乎不会导致与互利共生的直接冲突，而这似乎是共生体的生态和当代进化的一个重要机制。
Certain species of the Pooideae subfamily develop stress tolerance and herbivory resistance through symbiosis with vertically transmitted, asexual fungi. This symbiosis is specific, and genetic factors modulate the compatibility between partners. Although gene flow is clearly a fitness trait in allogamous grasses, because it injects hybrid vigor and raw material for evolution, it could reduce compatibility and thus mutualism effectiveness. To explore the importance of host genetic background in modulating the performance of symbiosis, Lolium multiflorum plants, infected and noninfected with Neotyphodium occultans, were crossed with genetically distant plants of isolines (susceptible and resistant to diclofop-methyl herbicide) bred from two cultivars and exposed to stress. The endophyte improved seedling survival in genotypes susceptible to herbicide, while it had a negative effect on one of the genetically resistant crosses. Mutualism provided resistance to herbivory independently of the host genotype, but this effect vanished under stress. While no endophyte effect was observed on host reproductive success, it was increased by interpopulation plant crosses. Neither gene flow nor herbicide had an important impact on endophyte transmission. Host fitness improvements attributable to gene flow do not appear to result in direct conflict with mutualism while this seems to be an important mechanism for the ecological and contemporary evolution of the symbiotum.
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影响因子：
5.7
作者：
Cheplick, Gregory P.
通讯作者：
Cheplick, Gregory P.
影响因子：
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作者：
CHRISTENSEN, MJ
通讯作者：
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影响因子：
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作者：
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作者：
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DOI：
10.1007/s10681-006-5939-3
发表时间：
2000-06-20
影响因子：
11.1
作者：
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通讯作者：
Schierenbeck, KA