scholarly journals Neotyphodium endophyte transmission to Lolium multiflorum seeds depends on the host plant fitness

2011 ◽  
Author(s):  
P.E. Gundel ◽  
L.A. Garibaldi ◽  
M.A. Martínez-Ghersa ◽  
C.M. Ghersa
Keyword(s):  
Host Plant ◽  
Lolium Multiflorum ◽  
Plant Fitness ◽  
Neotyphodium Endophyte

scholarly journals Viability of Neotyphodium endophytic fungus and endophyte-infected and noninfected Lolium multiflorum seeds

Botany ◽  
2009 ◽  
Vol 87 (1) ◽  
pp. 88-96 ◽  
Author(s):  
Pedro E. Gundel ◽  
M. Alejandra Martínez-Ghersa ◽  
Lucas A. Garibaldi ◽  
Claudio M. Ghersa
Keyword(s):  
High Temperature ◽  
Water Content ◽  
Lolium Multiflorum ◽  
Seed Viability ◽  
Cool Season ◽  
Differential Survival ◽  
Factors Affecting ◽  
Neotyphodium Endophyte ◽  
Endophyte Fungi ◽  
Seed Water Content

Neotyphodium endophyte fungi are vertically transmitted symbionts of cool-season grasses. The seed phase of the grass’ life cycle appears to be critical for the persistence of the fungus. Endophyte viability decreases faster than seed viability, but little is known of the effects of this endophyte on seed viability. The endophyte could affect seed viability through changes in water content. Here, we assessed the effects of the endophyte on seed viability, the differential survival of endophyte and seed, and the effects of infection on seed water content. Viability of endophyte-infected and noninfected seeds and endophyte were evaluated over a period of 729 d under 12 controlled environmental conditions. Seed viability was reduced by the infection at high temperature and high relative humidity, but not under other conditions. Moreover, endophyte viability decreased faster than seed viability only under high humidity or high temperature. Seed water content was not affected by endophyte presence. The proportion of viable infected seeds was mainly affected by the loss in endophyte viability and secondly by the differential survival of infected and noninfected seeds. Knowledge on the relative importance of these processes is critical to understand the factors affecting the efficiency of endophyte vertical transmission and the frequency of endophyte-infected plants.

scholarly journals Importance of Host Plant Species, Neotyphodium Endophyte Isolate, and Alkaloids on Feeding by Spodoptera frugiperda (Lepidoptera: Noctuidae) Larvae

2006 ◽  
Vol 99 (4) ◽  
pp. 1462-1473 ◽  
Author(s):  
Olivier J.-P. Ball ◽  
Thomas A. Coudron ◽  
Brian A. Tapper ◽  
Elizabeth Davies ◽  
David Trently ◽  
...  
Keyword(s):  
Host Plant ◽  
Plant Species ◽  
Spodoptera Frugiperda ◽  
Host Plant Species ◽  
Neotyphodium Endophyte ◽  
Lepidoptera Noctuidae

scholarly journals Effects of Neotyphodium endophyte infection on seed viability and germination vigour in Lolium multiflorum under accelerated ageing conditions

2007 ◽  
Vol 13 ◽  
pp. 277-280
Author(s):  
P.E. Gundel ◽  
J.B. Landesmann ◽  
M.A. Martínez-Ghersa ◽  
C.M. Ghersa
Keyword(s):  
Indirect Effects ◽  
Genetic Background ◽  
Population Genetic ◽  
Seed Quality ◽  
Lolium Multiflorum ◽  
Seed Viability ◽  
Accelerated Ageing ◽  
Pasture Grasses ◽  
Endophyte Infection ◽  
Neotyphodium Endophyte

Neotyphodium endophytes are obligate vertically-transmitted endo-symbionts of Lolium multiflorum grass. Thus, the success of endophyte is tied with the success of the seed. Here we present results from experiments aiming to test the effect of endophyte infection on seed viability and germination vigour. Endophyteinfected and non-infected seeds of three L. multiflorum accessions were compared under accelerated ageing conditions (40ºC and ≈15% moisture content). Endophyte negatively affected seed viability and seed germination vigour in only one of the evaluated accessions. The effect of endophyte presence on seed quality in pasture grasses could depend on the population genetic background, and be related to direct or indirect effects of fungal infection on seed morphological or physiological characteristics. Keywords: Lolium multiflorum, Neotyphodium endophyte, seed quality, accelerated ageing

Identification and host range assessment of Paratylenchus nanus (Tylenchida: Tylenchulidae) and Paratrichodorus minor (Triplonchida: Trichodoridae)

Nematology ◽  
2001 ◽  
Vol 3 (6) ◽  
pp. 483-490 ◽  
Author(s):  
Nigel Bell ◽  
Richard Watson
Keyword(s):  
New Zealand ◽  
Festuca Arundinacea ◽  
Trifolium Pratense ◽  
Lolium Multiflorum ◽  
Dactylis Glomerata ◽  
Initial Population ◽  
New Host ◽  
Neotyphodium Endophyte ◽  
Pasture Plants ◽  
New Host Records

AbstractAdult and juvenile characters were used to identify Paratylenchus nanus Cobb, 1923 and Paratrichodorus minor (Colbran, 1956) Siddiqi, 1974 from soils under pasture in New Zealand. In glasshouse tests of 15 pasture plants, common in New Zealand, all good hosts (ratio of final to initial population >1) of P. nanus were grasses, namely Dactylis glomerata , Lolium multiflorum and L. perenne (Neotyphodium endophyte-infected and-free), all new host records for this species. Good hosts of P.minor included those listed for P.nanus and Festuca arundinacea (endophyte-free) , Poa annua , Trifolium pratense , T. repens and T. subterraneum. Except for T. repens, these are all new host records for P.minor in New Zealand.

Effects of the Neotyphodium endophyte fungus on dormancy and germination rate of Lolium multiflorum seeds

2006 ◽  
Vol 31 (6) ◽  
pp. 767-775 ◽  
Author(s):  
PEDRO E. GUNDEL ◽  
PABLO H. MASEDA ◽  
CLAUDIO M. GHERSA ◽  
ROBERTO L. BENECH-ARNOLD
Keyword(s):  
Germination Rate ◽  
Lolium Multiflorum ◽  
Neotyphodium Endophyte

scholarly journals Constitutive expression of transgenes encoding derivatives of the synthetic antimicrobial peptide BP100: impact on rice host plant fitness

2012 ◽  
Vol 12 (1) ◽  
pp. 159 ◽  
Author(s):  
Anna Nadal ◽  
Maria Montero ◽  
Nuri Company ◽  
Esther Badosa ◽  
Joaquima Messeguer ◽  
...  
Keyword(s):  
Antimicrobial Peptide ◽  
Host Plant ◽  
Constitutive Expression ◽  
Plant Fitness ◽  
Derivatives Of

scholarly journals Variable performance of bird cherry-oat aphid on Neotyphodium-infected tall fescue from Tunisia

2007 ◽  
Vol 13 ◽  
pp. 337-340
Author(s):  
S.L. Clement ◽  
L.R. Elberson ◽  
B.L. Waldron ◽  
S.S. Quisenberry
Keyword(s):  
Host Plant ◽  
Plant Resistance ◽  
Tall Fescue ◽  
Host Plant Resistance ◽  
Rhopalosiphum Padi ◽  
Host Genotype ◽  
Neotyphodium Endophyte ◽  
Variable Performance

The extent of Neotyphodium based resistance in wild fescue to bird cherry-oat aphid (Rhopalosiphum padi) was determined by quantifying densities of this aphid on a series of Neotyphodiuminfected (E+) and uninfected (E-) tall fescue entries. Little or no aphid survival was observed on E+ 'Kentucky 31' tall fescue and three E+ wild tall fescue accessions (16079, 15978, 16075) from Tunisia; however, three E+ Tunisia accessions (16036, 16044, 16085) supported populations of R. padi. These results suggest that wild tall fescue from Tunisia harbour diverse Neotyphodium endophytes. They also support earlier observations by entomologists that the magnitude of insect (including aphids) resistance in E+ grasses varies with the host genotype and Neotyphodium strain involved in the interaction. Keywords: Neotyphodium endophyte, tall fescue, Rhopalosiphum padi, host plant resistance

Sign in / Sign up

Export Citation Format

Share Document