Host genotype overrides fungal endophyte infection in influencing tiller and spike production of Lolium perenne (Poaceae) in a common garden experiment

2008 ◽  
Vol 95 (9) ◽  
pp. 1063-1071 ◽  
Author(s):  
G. P. Cheplick
Keyword(s):  
Lolium Perenne ◽  
Common Garden ◽  
Fungal Endophyte ◽  
Common Garden Experiment ◽  
Host Genotype ◽  
Endophyte Infection

scholarly journals Host Genotype and Precipitation Influence of Fungal Endophyte Symbiosis and Mycotoxin Abundance in a Locoweed

2019 ◽  
Vol 20 (21) ◽  
pp. 5285
Author(s):  
Wei He ◽  
Linwei Guo ◽  
Lei Wang ◽  
Qianqian Zhao ◽  
Lizhu Guo ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Geographical Location ◽  
Population Level ◽  
Fungal Endophyte ◽  
Host Population ◽  
Host Genotype ◽  
Symbiotic Interactions ◽  
Naturally Occurring ◽  
Endophyte Infection ◽  
Host Genetic

Many plant endophytes produce mycotoxins, but how host genetic variation influences endophyte colonization and mycotoxin production under natural conditions is poorly understood. This interaction has not been fully considered in many previous studies which used controlled experiments with agronomic or model plant species. Here, we investigated this interaction in a naturally occurring forb (a locoweed species) Oxytropis ochrocephala, its symbiotic endophyte Alternaria oxytropis, and the mycotoxin swainsonine. Host genetic variation was characterized by microsatellite markers. Endophyte infection rate and swainsonine levels were determined by PCR and HPLC, respectively. Genetic markers defined two distinct host populations and revealed that host genetics were significantly correlated with geographical location, elevation, and precipitation. As the host diverged, symbiotic interactions were reduced or failed to produce detectable swainsonine in one host population. Host genotype and precipitation had a significant impact in shaping swainsonine production at the population level. This study highlights the effect of host genotype in influencing this interaction in locoweeds.

scholarly journals Host genotype structures the microbiome of a globally dispersed marine phytoplankton

2021 ◽  
Vol 118 (48) ◽  
pp. e2105207118
Author(s):  
Olivia M. Ahern ◽  
Kerry A. Whittaker ◽  
Tiffany C. Williams ◽  
Dana E. Hunt ◽  
Tatiana A. Rynearson
Keyword(s):  
Microbial Community Composition ◽  
Algal Growth ◽  
Common Garden ◽  
Marine Phytoplankton ◽  
Common Garden Experiment ◽  
Host Genotype ◽  
Genetic Population ◽  
Core Microbiome ◽  
Host Genetic ◽  
The Impact

Phytoplankton support complex bacterial microbiomes that rely on phytoplankton-derived extracellular compounds and perform functions necessary for algal growth. Recent work has revealed sophisticated interactions and exchanges of molecules between specific phytoplankton–bacteria pairs, but the role of host genotype in regulating those interactions is unknown. Here, we show how phytoplankton microbiomes are shaped by intraspecific genetic variation in the host using global environmental isolates of the model phytoplankton host Thalassiosira rotula and a laboratory common garden experiment. A set of 81 environmental T. rotula genotypes from three ocean basins and eight genetically distinct populations did not reveal a core microbiome. While no single bacterial phylotype was shared across all genotypes, we found strong genotypic influence of T. rotula, with microbiomes associating more strongly with host genetic population than with environmental factors. The microbiome association with host genetic population persisted across different ocean basins, suggesting that microbiomes may be associated with host populations for decades. To isolate the impact of host genotype on microbiomes, a common garden experiment using eight genotypes from three distinct host populations again found that host genotype influenced microbial community composition, suggesting that a process we describe as genotypic filtering, analogous to environmental filtering, shapes phytoplankton microbiomes. In both the environmental and laboratory studies, microbiome variation between genotypes suggests that other factors influenced microbiome composition but did not swamp the dominant signal of host genetic background. The long-term association of microbiomes with specific host genotypes reveals a possible mechanism explaining the evolution and maintenance of complex phytoplankton–bacteria chemical exchanges.

scholarly journals Metabolic Profiles of Lolium perenne Are Differentially Affected by Nitrogen Supply, Carbohydrate Content, and Fungal Endophyte Infection

2008 ◽  
Vol 146 (3) ◽  
pp. 1440-1453 ◽  
Author(s):  
Susanne Rasmussen ◽  
Anthony J. Parsons ◽  
Karl Fraser ◽  
Hong Xue ◽  
Jonathan A. Newman
Keyword(s):  
Lolium Perenne ◽  
Fungal Endophyte ◽  
Nitrogen Supply ◽  
Carbohydrate Content ◽  
Metabolic Profiles ◽  
Endophyte Infection

scholarly journals Endophytic fungus decreases plant virus infections in meadow ryegrass ( Lolium pratense )

2006 ◽  
Vol 2 (4) ◽  
pp. 620-623 ◽  
Author(s):  
Päivi T Lehtonen ◽  
Marjo Helander ◽  
Shahid A Siddiqui ◽  
Kirsi Lehto ◽  
Kari Saikkonen
Keyword(s):  
Barley Yellow Dwarf Virus ◽  
Common Garden ◽  
Fungal Endophyte ◽  
Virus Infections ◽  
Barley Yellow Dwarf ◽  
Viruliferous Aphid ◽  
Endophyte Infection ◽  
Aphid Vectors ◽  
Yellow Dwarf Virus ◽  
Lolium Pratense

We studied the effects of fungal endophyte infection of meadow ryegrass ( Lolium pratense = Festuca pratensis ) on the frequency of the barley yellow dwarf virus (BYDV). The virus is transferred by aphids, which may be deterred by endophyte-origin alkaloids within the plant. In our experiment, we released viruliferous aphid vectors on endophyte-infected and endophyte-free plants in a common garden. The number of aphids and the percentage of BYDV infections were lower in endophyte-infected plants compared to endophyte-free plants, indicating that endophyte infection may protect meadow ryegrass from BYDV infections.

scholarly journals Ryegrass production in Wairarapa, New Zealand: is biological control of Argentine stem weevil important?

2007 ◽  
Vol 13 ◽  
pp. 301-306
Author(s):  
M.R. Mcneill ◽  
D.E. Hume ◽  
R. Ashby ◽  
M. Ashby ◽  
P. Brandon ◽  
...  
Keyword(s):  
Lolium Perenne ◽  
Dry Matter ◽  
Fungal Endophyte ◽  
Wild Type ◽  
Neotyphodium Lolii ◽  
Endophyte Infection ◽  
Plant Persistence ◽  
Listronotus Bonariensis ◽  
Microctonus Hyperodae ◽  
Over Time

To investigate the interaction between Argentine stem weevil (Listronotus bonariensis), its parasitoid Microctonus hyperodae, fungal endophyte (Neotyphodium lolii) and its grass host, four endophyte-ryegrass (Lolium perenne) treatments were established on four farms in Wairarapa in autumn 2003. A diploid ryegrass contained either wild-type or AR1 endophyte or was endophytefree, while a tetraploid ryegrass contained AR1 endophyte. Wild-type, AR1 and endophyte-free ryegrasses average 52%, 91% and 2% endophyte-infected tillers for the 3 years of measurement. Moderate increases over time in the proportion of wild-type infected tillers indicated selection pressures favoured endophyte-infected tillers. Endophyte-free tiller populations were 11% lower than AR1 or wild-type but not significantly so. L. bonariensis populations were highest in endophyte-free and wild-type pastures and 80% lower in AR1 pastures. Mean rates of parasitism in L. bonariensis were lower in spring (9%) than autumn (35%), tended to be higher in wild-type than in AR1 diploid ryegrass, and only had a weak relationship with percent endophyte-infection. Keywords: endophyte, Neotyphodium lolii, Lolium perenne, dry matter yields, plant persistence, Listronotus bonariensis, Microctonus hyperodae

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