Neotyphodium endophyte transmission to Lolium multiflorum seeds depends on the host plant fitness
Frequency and distribution of symbiosis in nature depend both on the direct symbiont effect on the host fitness and on its efficiency to spread within host populations [transmission]. For vertically transmitted Neotyphodium fungi, the attention has been centered on the endophyte effect on host grass...
| Otros Autores: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2011Gundel.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 245 | 1 | 0 | |a Neotyphodium endophyte transmission to Lolium multiflorum seeds depends on the host plant fitness |
| 520 | |a Frequency and distribution of symbiosis in nature depend both on the direct symbiont effect on the host fitness and on its efficiency to spread within host populations [transmission]. For vertically transmitted Neotyphodium fungi, the attention has been centered on the endophyte effect on host grass plants but little is known about the controls of transmission. Environmental and genetic factors have been suggested as important controls of transmission efficiency. We studied the effect of these two factors on the transmission efficiency of the Neotyphodium endophyte in Lolium multiflorum plants. Plant genotype of a host population naturally endophyte-infected [95 percent] was manipulated by conducting controlled crosses with genetically distant plant populations. The resulting progeny was subjected to two types of factors, resource shortage and oxidative stress induced by an herbicide. Irrespective of plant genotype, high resource level increased seed yield per plant by 26-fold, spike-to-seed transmission by 12 percent, and plant-to-seed transmission by 10 percent [not significant]. Although herbicide effects could be mediated indirectly by changes in plant density or directly by oxidative stress, neither plant fitness nor transmission efficiency was affected. An interesting pattern between transmission efficiency and seed yield per plant was revealed when plants [from both experiments] were plotted together. Low yielding plants, that is plants that grew under low resource level at high plant density, showed high transmission failures whereas high yielding plants, that is plants growing at low density with and without herbicide treatment, showed high transmission rates. Transmission failures may be a consequence of the endophyte cost for host plants growing under restrictive conditions, suggesting that lower transmission efficiency may partially explain previous evidence showing lower endophyte infection frequency for grasses under stressful conditions. Host plants could be penalizing the endophyte through a competition-like mechanism, instead of depressing their own fitness. | ||
| 653 | 0 | |a GRASS-ENDOPHYTE SYMBIOSIS | |
| 653 | 0 | |a HERBICIDE | |
| 653 | 0 | |a MUTUALISM | |
| 653 | 0 | |a PLANT GENOTYPE | |
| 653 | 0 | |a RESOURCE AVAILABILITY | |
| 653 | 0 | |a TRANSMISSION EFFICIENCY | |
| 653 | 0 | |a VERTICAL TRANSMISSION | |
| 653 | 0 | |a ENDOPHYTE | |
| 653 | 0 | |a FITNESS | |
| 653 | 0 | |a FUNGUS | |
| 653 | 0 | |a GRASS | |
| 653 | 0 | |a HOST PLANT | |
| 653 | 0 | |a SEED | |
| 653 | 0 | |a FUNGI | |
| 653 | 0 | |a LOLIUM | |
| 653 | 0 | |a LOLIUM MULTIFLORUM | |
| 653 | 0 | |a NEOTYPHODIUM | |
| 653 | 0 | |a POACEAE | |
| 700 | 1 | |9 28667 |a Gundel, Pedro Emilio | |
| 700 | 1 | |9 31177 |a Garibaldi, Lucas Alejandro | |
| 700 | 1 | |9 7113 |a Martínez Ghersa, María Alejandra | |
| 700 | 1 | |9 7549 |a Ghersa, Claudio Marco | |
| 773 | |t Environmental and Experimental Botany |g Vol.71, no.3 (2011), p.359-366 | ||
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| 900 | |a ^tNeotyphodium endophyte transmission to Lolium multiflorum seeds depends on the host plant fitness | ||
| 900 | |a ^aGundel^bP.E. | ||
| 900 | |a ^aGaribaldi^bL.A. | ||
| 900 | |a ^aMartínez-Ghersa^bM.A. | ||
| 900 | |a ^aGhersa^bC.M. | ||
| 900 | |a ^aGundel^bP. E. | ||
| 900 | |a ^aGaribaldi^bL. A. | ||
| 900 | |a ^aMartínez Ghersa^bM. A. | ||
| 900 | |a ^aGhersa^bC. M. | ||
| 900 | |a ^aGundel^bP.E.^tIFEVA-Facultad de AgronomÃa [UBA]/CONICET, Cátedra de EcologÃa, Av. San MartÃn 4453, C1417DSE, Buenos Aires, Argentina | ||
| 900 | |a ^aGaribaldi^bL.A.^tIFEVA-Facultad de AgronomÃa [UBA]/CONICET, Cátedra de EcologÃa and Cátedra de Métodos Cuantitativos Aplicados, Av. San MartÃn 4453, C1417DSE, Buenos Aires, Argentina | ||
| 900 | |a ^aMartÃnez-Ghersa^bM.A.^tLaboratorio Ecotono, INIBIOMA-CONICET and Centro Regional Universitario Bariloche, Universidad Nacional del Comahue, Quintral 1250, 8400, S.C. de Bariloche, RÃo Negro, Argentina | ||
| 900 | |a ^aGhersa^bC.M. | ||
| 900 | |a ^tEnvironmental and Experimental Botany^cEnviron. Exp. Bot. | ||
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| 900 | |a Vol. 71, no. 3 | ||
| 900 | |a 366 | ||
| 900 | |a GRASS-ENDOPHYTE SYMBIOSIS | ||
| 900 | |a HERBICIDE | ||
| 900 | |a MUTUALISM | ||
| 900 | |a PLANT GENOTYPE | ||
| 900 | |a RESOURCE AVAILABILITY | ||
| 900 | |a TRANSMISSION EFFICIENCY | ||
| 900 | |a VERTICAL TRANSMISSION | ||
| 900 | |a ENDOPHYTE | ||
| 900 | |a FITNESS | ||
| 900 | |a FUNGUS | ||
| 900 | |a GRASS | ||
| 900 | |a HOST PLANT | ||
| 900 | |a SEED | ||
| 900 | |a FUNGI | ||
| 900 | |a LOLIUM | ||
| 900 | |a LOLIUM MULTIFLORUM | ||
| 900 | |a NEOTYPHODIUM | ||
| 900 | |a POACEAE | ||
| 900 | |a Frequency and distribution of symbiosis in nature depend both on the direct symbiont effect on the host fitness and on its efficiency to spread within host populations [transmission]. For vertically transmitted Neotyphodium fungi, the attention has been centered on the endophyte effect on host grass plants but little is known about the controls of transmission. Environmental and genetic factors have been suggested as important controls of transmission efficiency. We studied the effect of these two factors on the transmission efficiency of the Neotyphodium endophyte in Lolium multiflorum plants. Plant genotype of a host population naturally endophyte-infected [95 percent] was manipulated by conducting controlled crosses with genetically distant plant populations. The resulting progeny was subjected to two types of factors, resource shortage and oxidative stress induced by an herbicide. Irrespective of plant genotype, high resource level increased seed yield per plant by 26-fold, spike-to-seed transmission by 12 percent, and plant-to-seed transmission by 10 percent [not significant]. Although herbicide effects could be mediated indirectly by changes in plant density or directly by oxidative stress, neither plant fitness nor transmission efficiency was affected. An interesting pattern between transmission efficiency and seed yield per plant was revealed when plants [from both experiments] were plotted together. Low yielding plants, that is plants that grew under low resource level at high plant density, showed high transmission failures whereas high yielding plants, that is plants growing at low density with and without herbicide treatment, showed high transmission rates. Transmission failures may be a consequence of the endophyte cost for host plants growing under restrictive conditions, suggesting that lower transmission efficiency may partially explain previous evidence showing lower endophyte infection frequency for grasses under stressful conditions. Host plants could be penalizing the endophyte through a competition-like mechanism, instead of depressing their own fitness. | ||
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