Association of seed‐borne Fusarium species on Pinus ponderosa with germination and seedling viability in Argentina

Salerno, M.; Lori, Gladys Albina

doi:10.1111/j.1439-0329.2007.00505.x

Cited by 10 publications

(7 citation statements)

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“…En la Figura 1c se muestra la germinación (Summerell & Leslie, 2011). The pathogenicity of F. equiseti has been reported in previous studies on Pinus ponderosa Douglas ex C. Lawson seeds, and it has been demonstrated to cause damping-off and root rot on seedlings (Salerno & Lori, 2007). Additionally, F. equiseti is prevalent in ginseng (Panax quinquefolius L.) soil causing the discoloration of the root surface (Punja et al, 2008).…”

Section: Prueba De Patogenicidad E Identificación De Aislados Fúngicosmentioning

confidence: 96%

“…Fusarium es uno de los géneros más importantes que causan enfermedades en las plantas, producen micotoxinas y afectan la salud humana (Summerell & Leslie, 2011). La patogenicidad de F. equiseti ha sido reportada en estudios previos sobre semillas de Pinus ponderosa Douglas ex C. Lawson y se ha demostrado que causa caída de almácigos y pudrición de raíz en plántulas (Salerno & Lori, 2007). Además, F. equiseti es frecuente en suelo de ginseng (Panax quinquefolius L.), provocando la decoloración de la superficie de la raíz (Punja et al, 2008).…”

Section: Effects Of Chitosan On Mycelial Growth Of F Equiseti and Cunclassified

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Efectos del quitosano en hongos fitopátogenos y en la germinación de semillas de Jatropha curcas L.

Pabón-Baquero

Valle

Evangelista‐Lozano

et al. 2015

Rev Cha Se Cie For y del Amb

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Efectos del quitosano en hongos fitopátogenos y en la germinación de semillas de Jatropha curcas L. AbstractJ atropha curcas is a plant with great agricultural and industrial potential. In this study, two fungal species were isolated from ungerminated seeds. The fungal isolates were morphologically and molecularly identified as Fusarium equiseti and Curvularia lunata. Effects of chitosan on mycelial growth, sporulation and spore germination of F. equiseti and C. lunata were evaluated. In addition, its effect on seed germination of J. curcas was studied.The results showed that all tested chitosan concentrations (0.5, 1.0, 2.0 and 4.0 mg·mL -1 ) inhibited the mycelial growth of the fungi. Sporulation and spore germination responses differed depending on the fungal species. Chitosan completely inhibited sporulation of C. lunata and spore germination of F. equiseti. Inoculation with F. equiseti and C. lunata reduced seed germination of J. curcas by 20 and 26.6 %, respectively. However, application of chitosan before inoculation inhibited pathogenic activity. Therefore, chitosan did not affect seed germination and caused inhibitory effects on F. equiseti and C. lunata. This is the first report on the effect of chitosan on J. curcas. ResumenJ atropha curcas es una planta con gran potencial agrícola e industrial. En este estudio se aislaron dos hongos de semillas no germinadas. Los aislamientos fúngicos se identificaron morfológica y molecularmente como Fusarium equiseti y Curvularia lunata. Los efectos del quitosano se evaluaron sobre el crecimiento micelial, esporulación y germinación de esporas de F. equiseti y C. lunata. Además, se estudió el efecto sobre la germinación de las semillas de J. curcas. Los resultados demostraron que todas las concentraciones probadas de quitosano (0.5, 1.0, 2.0 y 4.0 mg·mL -1 ) inhibieron el crecimiento micelial de los hongos. Las respuestas de esporulación y germinación de esporas fueron diferentes dependiendo de la especie fúngica; el quitosano inhibió completamente la esporulación C. lunata y la germinación de esporas de F. equiseti. La inoculación con F. equiseti y C. lunata redujo la germinación de semillas de J. curcas 20 y 26.6 %, respectivamente; sin embargo, la aplicación de quitosano antes de la inoculación inhibió la actividad patogénica. En conclusión, el quitosano no afectó la germinación de las semillas y causó efectos inhibitorios en F. equiseti y C. lunata. Este es el primer reporte del efecto del quitosano en J. curcas.

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Section: Prueba De Patogenicidad E Identificación De Aislados Fúngicosmentioning

confidence: 96%

Section: Effects Of Chitosan On Mycelial Growth Of F Equiseti and Cunclassified

Efectos del quitosano en hongos fitopátogenos y en la germinación de semillas de Jatropha curcas L.

Pabón-Baquero

Valle

Evangelista‐Lozano

et al. 2015

Rev Cha Se Cie For y del Amb

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“…Most fungi associated with seeds are harmless or nuisance pathogens, but a number of species are known to reduce the viability and germinability of conifer seeds or cause diseases in seedlings (Mittal et al 1990, Sutherland et al 2002, Salerno & Lori 2007. Species for example in genera Penicillium, Aspergillus and Cladosporium are mostly saprophytic and invade dead or damaged seeds.…”

Section: Seed-borne Microbes and Their Control During Seed Handling Amentioning

confidence: 99%

“…Another typical disease caused by seed-borne fungi is damping-off, in which germinants are infected and die before emergence, or necrosis appears in small seedlings near the ground line (Sutherland et al 2002). Fungi in genera such as Fusarium, Alternaria and Phoma are known to cause damping-off in numerous plant species (Mittal & Wang 1993, Lilja et al 1995, Salerno & Lori 2007. Root rot is often caused by similar fungi, but in the last decade it has seldom caused problems in Finnish nurseries due to changes is seedling production practices and nursery hygiene.…”

Section: Seed-borne Microbes and Their Control During Seed Handling Amentioning

confidence: 99%

Seed quality attributes in seedling production of Norway spruce (Picea abies (L.) Karst.)

Himanen¹

2018

Diss. For.

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The artificial regeneration of Norway spruce (Picea abies (L.) Karst.) in the Nordic countries relies on planting containerized seedlings originating from seeds collected from either seed orchards or forest stands. The aim of this thesis is to investigate the effect of seed quality attributes on seedling production and to study whether it is possible to enhance germinability and seedling health through seed soaking treatments. The variation in seed quality among individual trees and clones and the components of seed weight variance are also studied. Commercial seed lots were screened for microbes and the effect of soaking treatment on microbial abundance was analyzed. The three seed lots contained some pathogenic fungi, but most fungi found were saprophytic. The seed lots differed in their likelihood to suffer from damping-off when germinated in water agar medium but not in peat. With current production methods seed-borne fungi do not have a great impact for seedling health, but altering for example the growing media may increase their importance. Seedling quality declined with increasing emergence time in an experiment on 1-yearold seedlings in the nursery, thus emphasizing the importance of fast germination. Seed soak-sorting hastened the emergence and increased seedling size more in 1.5-year-old containerized seedlings compared to the 1-year-old seedling crop in addition of decreasing the proportion of cull seedlings. The proportion of full seeds varied between individual trees and clones in cones collected from a forest stand and from a seed orchard. The average seed weights differed between trees or clones, but intracone variation was the greatest source of seed weight variance. This indicates that weight-based seed sorting may have a smaller impact on the genetic diversity of seed lots than previously thought. Seed and seedling producers as well as society have different preferences for seed quality attributes and different tools for quality management.

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“…Pathogenic fungi attacking tusam seedling was isolated according to a procedure developed by Salerno and Lory (2007).…”

Section: Identification Of Fungal Pathogenmentioning

confidence: 99%

THE INFECTION PROCESS OF Fusarium subglutinans IN Pinus merkusii SEEDLINGS

et al. 2014

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Pinus merkusii or tusam is an original Indonesian plant and it is naturally distributed in Aceh and North Sumatra. Damping-off disease is the main problem in its nurseries. Fusarium subglutinans is one of the leading causes of damping-off disease. The knowledge of fungal infections process of tusam seedlings is essential to control dampingoff disease effectively.The aim of this research is to understand (1) infection process of F. subglutinans in tusam seedlings and the defence response of seedlings against the infection of F. subglutinans. The methods used in this research were (1) identification of fungal pathogens that causing the disease, (2) pathogenicity test of F. subglutinans, (3) detection the accumulation of lignin, accumulation of callose and hypersensitive reactions by staining of seedling tissue using phloroglucinol, aniline blue and lactophenol trypan blue.The results of this study revealed that spores germination occurred in two days after inoculation. Direct penetration through cell wall and stomata was observed on the third day after inoculation. There was hypersensitive reaction in stomata. Accumulation of callose and lignin appeared on the third day after inoculation. However, defence response of seedlings was not effective, as F. subglutinans is a necrotroph fungus.

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Association of seed‐borne Fusarium species on Pinus ponderosa with germination and seedling viability in Argentina

Cited by 10 publications

References 10 publications

Efectos del quitosano en hongos fitopátogenos y en la germinación de semillas de Jatropha curcas L.

Efectos del quitosano en hongos fitopátogenos y en la germinación de semillas de Jatropha curcas L.

Seed quality attributes in seedling production of Norway spruce (<i>Picea abies</i> (L.) Karst.)

THE INFECTION PROCESS OF Fusarium subglutinans IN Pinus merkusii SEEDLINGS

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