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You searched for: Journal name Phytopathology Remove constraint Journal name: Phytopathology Publication year rev 8003-1997 Remove constraint Publication year rev: 8003-1997 Source 1997 v.87 no.9 Remove constraint Source: 1997 v.87 no.9
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1. Characterization of Colletotrichum acutatum isolates causing anthracnose of almond and peach in California

Author:
Adaskaveg, J.E.; Hartin, R.J.
Source:
Phytopathology 1997 v.87 no.9 pp. 979-987
ISSN:
0031-949X
Subject:
Glomerella cingulata; diagnostic techniques; plant diseases and disorders; conidia; DNA; pathotypes; genetic variation; disease control; Colletotrichum acutatum; Prunus persica; plant pathogenic fungi; pathogenicity; benomyl; genetic techniques and protocols; captan; nucleotide sequences; Prunus dulcis
Abstract:
... The causal organism responsible for the recent outbreak of almond and peach anthracnose in California was identified and characterized as Colletotrichum acutatum. Isolates of C. acutatum from almond were found to be similar to California strawberry isolates and South Carolina peach and apple isolates of C. acutatum based on conidial morphology, temperature relationships, fungicide sensitivity, and ...
DOI:
10.1094/PHYTO.1997.87.9.979
PubMed:
18945071

2. Effects of leaf wetness duration and temperature on infection efficiency, latent period, and rate of pustule appearance of rust in alfalfa

Author:
Webb, D.H.; Nutter, F.W. Jr.
Source:
Phytopathology 1997 v.87 no.9 pp. 946-950
ISSN:
0031-949X
Subject:
Medicago sativa; pathogenicity; plant pathogenic fungi; water content; temperature; leaves; Iowa
Abstract:
... Dew and growth chamber tests were conducted on the alfalfa cultivar Ranger to determine the effect of duration of leaf wetness and temperature on several components of the alfalfa rust (Uromyces striatus) monocycle. Duration of leaf wetness and temperature both had significant effects on pustule development. Infection efficiency (number of alfalfa rust pustules per leaf) increased linearly as dura ...
DOI:
10.1094/PHYTO.1997.87.9.946
PubMed:
18945066

3. Mutation in the arvBs1 avirulence gene of Xanthomonas campestris pv. vesicatoria influences survival of the bacterium in soil and detached leaf tissue

Author:
O'Garro, L.W.; Gibbs, H.; Newton, A.
Source:
Phytopathology 1997 v.87 no.9 pp. 960-966
ISSN:
0031-949X
Subject:
Capsicum annuum; Xanthomonas vesicatoria; mutation; inoculum; genes; virulence; mortality; leaves
Abstract:
... The role of the avrBs1 avirulence gene of Xanthomonas campestris pv. vesicatoria in survival of the bacterium was investigated by testing two strains that differ in the structure and function of the gene in 37 different soil types of Barbados and detached leaf tissue of four pepper genotypes. One strain carried a mutation in the avrBs1 gene and lacked avirulence activity, while the other expressed ...
DOI:
10.1094/PHYTO.1997.87.9.960

4. Pathway for phloem-dependent movement of pepper mottle potyvirus in the stem of Capsicum annuum

Author:
Andrianifahanana, M.; Lovins, K.; Dute, R.; Sikora, E.; Murphy, J.F.
Source:
Phytopathology 1997 v.87 no.9 pp. 892-898
ISSN:
0031-949X
Subject:
Pepper mottle virus; stems; Capsicum annuum; developmental stages; disease transmission; pathogenicity; phloem; leaves
Abstract:
... Phloem-dependent movement of pepper mottle potyvirus (PepMoV) through Capsicum annuum occurs in a defined pattern through the stem and into uninoculated leaves. The route of movement of PepMoV through the stem of C. annuum 'Early Calwonder' was tracked using immuno-tissue blot analysis and immunomicroscopy. Virus was shown to move from the inoculated leaf down the stem toward the roots via the ext ...
DOI:
10.1094/PHYTO.1997.87.9.892
PubMed:
18945059

5. Purification, elicitor activity, and cell wall localization of a glycoprotein from Phytophthora parasitica var. nicotianae a fungal pathogen of tobacco

Author:
Sejalon-Delmas, N.; Villalba Mateos, F.; Bottin, A.; Rickauer, M.; Dargent, R.; Esquerre-Tugaye, M.T.
Source:
Phytopathology 1997 v.87 no.9 pp. 899-909
ISSN:
0031-949X
Subject:
cell wall components; host-parasite relationships; pathogenicity; Nicotiana tabacum; plant pathogenic fungi; Phytophthora nicotianae var. parasitica; disease resistance; genetic variation; cell lines; glycoproteins; protein composition
Abstract:
... A glycoprotein of 34 kDa (GP 34) was solubilized at acidic pH from the mycelium of Phytophthora parasitica var. nicotianae and was purified by ion exchange and gel permeation chromatography. Whole tobacco plants treated with GP 34 through their roots showed an enhanced lipoxygenase activity as well as hydroxyproline-rich glycoprotein accumulation, indicating that this molecule had elicitor propert ...
DOI:
10.1094/PHYTO.1997.87.9.899
PubMed:
18945060

6. Rhizosphere competence of Pythrium oligandrum

Author:
Al-Rawahi, A.K.; Hancock, J.G.
Source:
Phytopathology 1997 v.87 no.9 pp. 951-959
ISSN:
0031-949X
Subject:
Lactuca sativa; inoculum density; Phaseolus vulgaris; plant pathogenic fungi; roots; plant diseases and disorders; rhizosphere; Capsicum annuum; Triticum aestivum; Sclerotinia sclerotiorum; Pythium aphanidermatum; Cucumis sativus; Cucumis melo; disease control; pathogenicity; Pythium sylvaticum; Brassica oleracea; Pythium ultimum; Beta vulgaris; Solanum lycopersicum var. lycopersicum; biological control; soil fungi; Pythium oligandrum; Medicago sativa; Pythium irregulare; Raphanus sativus; California
Abstract:
... The associations of Pythium oligandrum with the root cortex, rhizoplane, and rhizosphere were measured with 11 crop species. This work was expedited by the use of a semiselective technique for isolation of P. oligandrum from soil and plant material. Cortical colonization of roots by P. oligandrum was not detected, and the rhizoplanes of the roots of most crops were free of the fungus. However, P. ...
DOI:
10.1094/PHYTO.1997.87.9.951

7. Seed transmission of cucumber mosaic virus in spinach

Author:
Yang, Y.; Kim, K.S.; Anderson, E.J.
Source:
Phytopathology 1997 v.87 no.9 pp. 924-931
ISSN:
0031-949X
Subject:
Spinacia oleracea; Cucumber mosaic virus; pathogenicity; disease transmission; seeds; inoculum; genetic techniques and protocols; coat proteins; genes; nucleotide sequences
Abstract:
... Spinach (Spinacia oleracea) seed from a commercial breeding line suspected of harboring cucumber mosaic virus (CMV) was analyzed for seed transmission of the virus. Initial seed grow-out tests and enzyme-linked immunosorbent assay studies indicated that CMV was present in this seed lot at a level of nearly 15%. To verify these results and gain insight into the mechanism of seed transmission, four ...
DOI:
10.1094/PHYTO.1997.87.9.924
PubMed:
18945063

8. Sensitivity to protectant fungicides and pathogenic fitness of clonal lineages of Phytophthora infestans in the United States

Author:
Kato, M.; Mizubuti, E.S.; Goodwin, S.B.; Fry, W.E.
Source:
Phytopathology 1997 v.87 no.9 pp. 973-978
ISSN:
0031-949X
Subject:
Solanum tuberosum; Phytophthora infestans; plant pathogenic fungi; pathogenicity; chlorothalonil; mancozeb; fungicide resistance; clones; pathotypes; genetic variation; strain differences; disease control; plant diseases and disorders; United States
Abstract:
... Since 1991, dramatic changes have occurred in the genetic composition of populations of Phytophthora infestans in the United States. Clonal lineages recently introduced into the United States (US-7 and US-8) are more common now than the previously dominant lineage (US-1). To help determine why these changes occurred, four clonal lineages of P. infestans common during the early 1990s in the United ...
DOI:
10.1094/PHYTO.1997.87.9.973
PubMed:
18945070

9. Sequence and relationships of sugarcane mosaic and sorghum mosaic virus strains and development of RT-PCR-based RFLPs for strain discrimination

Author:
Yang, Z.N.; Mirkov, T.E.
Source:
Phytopathology 1997 v.87 no.9 pp. 932-939
ISSN:
0031-949X
Subject:
coat proteins; diagnostic techniques; complementary DNA; Saccharum; strain differences; phylogeny; reverse transcriptase polymerase chain reaction; clones; genes; nucleotide sequences; Sorghum bicolor; Sugarcane mosaic virus
Abstract:
... Sugarcane mosaic is the most widespread virus disease affecting sugarcane production. We have established a collection of seven prominent sugarcane mosaic potyvirus (SCMV) strains currently causing disease in sugarcane throughout the world and originally found in sugarcane in the United States. This collection includes SCMV strains A, B, D, and E, and the sorghum mosaic virus (SrMV) strains SCH, S ...
DOI:
10.1094/PHYTO.1997.87.9.932
PubMed:
18945064

10. Where are all the undescribed fungi?

Author:
Hawksworth, D.L.; Rossman, A.Y.
Source:
Phytopathology 1997 v.87 no.9 pp. 888-891
ISSN:
0031-949X
Subject:
species diversity; new species; habitats; fungi
Abstract:
... The hypothesis that there are 1.5 million fungal species on Earth, of which only about 70,000 are described, implies that 1.43 million remain undescribed. The recognition that many new species have yet to be found is of fundamental importance to plant pathologists, agronomists, and plant regulatory officials, among others, who continue to encounter diseases caused by previously unknown or understu ...
DOI:
10.1094/PHYTO.1997.87.9.888
PubMed:
18945058

11. AAL-toxin-deficient mutants of Alternaria alternata tomato pathotype by restriction enzyme-mediated integration

Author:
Akamatsu, H.; Itoh, Y.; Kodama, M.; Otani, H.; Kohmoto, K.
Source:
Phytopathology 1997 v.87 no.9 pp. 967-972
ISSN:
0031-949X
Subject:
Solanum lycopersicum var. lycopersicum; Alternaria alternata; plant pathogenic fungi; pathotypes; genetic transformation; transgenic plants; mutants; genetic techniques and protocols; mycotoxins; pathogenicity; host specificity; genetic variation; protein composition; enzymes
Abstract:
... Host-specific toxins are produced by three pathotypes of Alternaria alternata: AM-toxin, which affects apple; AK-toxin, which affects Japanese pear; and AAL-toxin, which affects tomato. Each toxin has a role in pathogenesis. To facilitate molecular genetic analysis of toxin production, isolation of toxin-deficient mutants utilizing ectopic integration of plasmid DNA has been attempted. However, th ...
DOI:
10.1094/PHYTO.1997.87.9.967
PubMed:
18945069

12. Comparison of virulence and isozyme phenotypes of Pgt-QCCJ and Great Plains races of Puccinia graminis f.sp. tritici

Author:
Roelfs, A.P.; McCallum, B.; McVey, D.V.; Groth, J.V.
Source:
Phytopathology 1997 v.87 no.9 pp. 910-914
ISSN:
0031-949X
Subject:
phenotype; Hordeum vulgare; Puccinia graminis; Triticum aestivum; plant pathogenic fungi; genetic techniques and protocols; genes; genetic variation; pathotypes; isozymes; virulence; protein composition
Abstract:
... Stem rust race Pgt-QCCJ was first found in the Great Plains of the United States in 1989, collected primarily from barley. This race became a major part of the Puccinia graminis f. sp. tritici population, even though it is virulent to only a few hard red winter wheat cultivars in the central Great Plains and to barley in the northern Great Plains. It threatens barley production in the northern Gre ...
DOI:
10.1094/PHYTO.1997.87.9.910
PubMed:
18945061

13. Formation of Sclerotia and aflatoxins in developing cotton bolls infected by the S strain of Aspergillus flavus and potential for biocontrol with an atoxigenic strain

Author:
Garber, R.K.; Cotty, P.J.
Source:
Phytopathology 1997 v.87 no.9 pp. 940-945
ISSN:
0031-949X
Subject:
plant diseases and disorders; biosynthesis; Gossypium hirsutum; sclerotia; developmental stages; strain differences; aflatoxins; disease control; plant morphology; virulence; bolls; Aspergillus flavus; biological control
Abstract:
... Aspergillus flavus can be divided into the S and L strains on the basis of sclerotial morphology. On average, S strain isolates produce greater quantities of aflatoxins than do L strain isolates. Sclerotia of the S strain were observed in commercial seed cotton from western Arizona. Greenhouse tests were performed to better define sclerotial formation in developing bolls. Eight S strain isolates w ...
DOI:
10.1094/PHYTO.1997.87.9.940
PubMed:
18945065

14. Fusarium oxysporum f.sp. cubense consists of a small number of divergent and globally distributed clonal lineages

Author:
Koenig, R.L.; Ploetz, R.C.; Kistler, H.C.
Source:
Phytopathology 1997 v.87 no.9 pp. 915-923
ISSN:
0031-949X
Subject:
restriction fragment length polymorphism; Fusarium oxysporum f. sp. cubense; cultivars; alleles; loci; haplotypes; geographical variation; asexual reproduction; phylogeny; Musa; clones; pathogenicity; plant pathogenic fungi; genetic techniques and protocols; pathotypes
Abstract:
... A worldwide collection of Fusarium oxysporum f. sp. cubense was analyzed using anonymous, single-copy, restriction fragment length polymorphism (RFLP) loci. Several lines of evidence indicated that this pathogen has a clonal population structure. Of the 165 isolates examined, only 72 RFLP haplotypes were identified, and nearly half the isolates were represented by the five most common haplotypes. ...
DOI:
10.1094/PHYTO.1997.87.9.915
PubMed:
18945062