Author:
Dyer David R.,Newman Molli,Lawrence Kathy S.
Abstract
This study assess the population diversity and temporal variability of caused by Fusarium oxysporum f. sp. vasinfectum (FOV) races/genotypes infecting cotton cultivars with either FOV or Meloidogyne incognita resistance. All plants sampled demonstrated typical symptoms of FOV including wilting, chlorosis and necrosis of the leaves, and discoloration of the vascular tissue in the stem. A diverse population of FOV was characterized. Eight races/genotypes of FOV were collected throughout the three site years. FOV race 1 was the most predominant in all tests (AUDPC=101.1); statistically higher numbers of isolates from LA-108 (AUDPC=59.9), race 8 (AUDPC=47.5), and race 2 (AUDPC=38.6) were also found compared to other races and genotypes collected. FOV race 1, race 2, race 8, and 108 were the most virulent races identified. The genotypes MDS-12, LA-110, and LA-127/140 were found in all tests but at a low incidence, and LA-112 was only found in trace amounts. MDS-12, LA-110, LA-112, and LA-127/140 produced less disease pressure. FOV race 4 which is highly virulent and present in California and Texas was not found in Alabama. A positive correlation was observed between the accumulation of growing degree days and FOV race 1, race 2, race 8, LA-108, and LA-110. Later symptom expression influenced by seasonal heat partially mitigates damage allowing cotton to produce bolls though they may be reduced in number and lint quality. Plant resistance to the FOV as expressed in these cultivars appears to provide better protection than M. incognita resistance. PhytoGen 72, which is resistant to FOV races/genotypes had low levels of FOV infection even though it sustained a high level of M. incognita root population density. The M. incognita resistant cultivars Deltapine 1558NR B2RF and PhytoGen 480 W3FE supported a lower nematode population density, however, FOV disease incidence was not reduced. FOV races/genotypes did not vary significantly between the nematode resistant and nematode susceptible cultivars.
Subject
General Earth and Planetary Sciences,General Environmental Science
Reference70 articles.
1. A race of the cotton-wilt Fusarium causing wilt on yelredo soybean and flue-cured tobacco;Armstrong;Plant Dis. Rep.,1958
2. Some diseases of cotton;Atkinson;Agric. Experiment. Station Bull. Agric. Mechanical. Coll.,1982
3. Detection and characterization of fusarium oxysporum f. sp. vasinfectum VCG0114 (Race 4) isolates of diverse geographic origins;Bell;Plant Dis.,2019
4. Genetic diversity, virulence, and Meloidogyne incognita interactions of Fusarium oxysporum isolates causing wilt in Georgia;Bell;Plant Dis.,2017
5. Sequence characterization of race 4-like isolates of Fusarium oxysporum from Alabama and Mississippi;Bennett;J. Cotton. Sci.,2013
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