Incomplete Infection of Secondarily Infected Potato Plants – an Environment Dependent Underestimated Mechanism in Plant Virology
| Autor: | Lukas Bertschinger, Brion Duffy, Urs Scheidegger, Lukas Bühler, Brice Dupuis, Ernst R. Keller, Gregory A. Forbes, Paul C. Struik, Cesare Gessler |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Gene-silencing Crop Physiology Secondary infection Autoinfection autoinfection Luteovirus seed degeneration Plant Science 01 natural sciences Virus Seed potato systems 03 medical and health sciences Pathosystem Plant virus Hypothesis and Theory Climate change Plant breeding plant viruses seed potato systems food security climate change epigenetics gene-silencing biology Seed degeneration fungi Potyvirus Plant viruses food and beverages Food security biology.organism_classification Potexvirus PE&RC Virology 030104 developmental biology Epigenetics 010606 plant biology & botany |
| Zdroj: | Frontiers in Plant Science Frontiers in Plant Science, 8(FEBRUARY) Frontiers in Plant Science, 8 Frontiers in Plant Science 8 (2017) FEBRUARY |
| ISSN: | 1664-462X |
| DOI: | 10.3389/fpls.2017.00074 |
| Popis: | The common assumption in potato virus epidemiology is that all daughter tubers produced by plants coming from infected mother tubers (secondary infection) will become infected via systemic translocation of the virus during growth. We hypothesize that depending on the prevalent environmental conditions, only a portion of the daughter tubers of a plant that is secondarily infected by viruses may become infected. To test this hypothesis experimental data from standardized field experiments were produced in three contrasting environments at 112, 3280, and 4000 m a.s.l. in Peru during two growing seasons. In these experiments, the percentage of infected daughter tubers produced by seed tubers that were infected with either potato potexvirus X (PVX), potato Andean mottle comovirus (APMoV), potato potyvirus Y (PVY) (jointly infected with PVX) or potato leafroll luteovirus (PLRV) was determined. Incomplete autoinfection was found in all cases, as the percentage of virus infected daughter tubers harvested from secondarily infected plants was invariably less than 100%, with the lowest percentage of infection being 30%. Changing the growing site to higher altitudes decreased autoinfection for all viruses. Therefore, the assumption of complete autoinfection of secondarily infected plants were rejected, while the hypothesis of environmentally dependent incomplete autoinfection was accepted. The findings help explain the occurrence of traditional seed management practices in the Andes and may help to develop locally adapted seed systems in environments of the world that have no steady access to healthy seed tubers coming from a formally certified seed system. The results obtained almost three decades ago are discussed in light of most recent knowledge on epigenetic regulation of host plant – virus interactions which allow for speculating about the underlying biological principles of the incomplete autoinfection. A research roadmap is proposed for achieving explicit experimental proof for the epigenetic regulation of incomplete autoinfection in the pathosystem under study. Frontiers in Plant Science, 8 ISSN:1664-462X |
| Databáze: | OpenAIRE |
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