Phytophthora Root Rot of Alfalfa in Central New York

Wilkinson, H. T.; Millar, R. L.

doi:10.1094/pd-65-127

Cited by 4 publications

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“…Both soil flooding (2,3,4,11,13) and Phytophthora root rot (PRR), caused by Phytophthora megasperma f. sp. medicaginis (5,14), have been identified as important factors in this response. Soil flooding and the occurrence of PRR are known to be linked (8,9,14), but the occurrence of flooding damage before the time required for the effects of PRR to appear led Barta (2) and Thompson and Fick (13) to question, first, if PRR had a primary role in the damage syndrome and, secondly, whether the breeding program for resistance to PRR actually involved selection for tolerance to flooded soil conditions rather than for PRR resistance.…”

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Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage¹

Mueller¹,

Fick

1987

Agronomy Journal

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Alfalfa (Medicago sativa L.) growth and development is known to be adversely affected by Phytophthora megasperma Drechs. f. sp. medicaginis (Pmm), a root rotting fungus most active under waterlogged soil conditions. The response of the plant to the pathogen under low levels of flooding stress is not well-established, but that relationship is important during alfalfa establishment on soils flooded for short periods by rainfall. Our main objective was to determine if yield reductions caused by the disease occurred in the absence of yield reductions caused by flooding on seedling alfalfa plants. Controlled environment studies were conducted to quantify the effects of flooding or inoculation with Pmm, or both, on alfalfa yield and disease severity, and to examine the differential response of a susceptible ('Iroquois') and a resistant ('Oneida') cultivar. At 26°C, one or two 3-day cycles of flooding with subsequent 4-day drainage periods did not reduce dry matter yields of alfalfa shoots grown in either soil (mixed, mesic Typic Udipsamment) or vermiculite. Inoculation with Pmm significantly reduced the shoot yield of Iroquois, but not that of Oneida. The presence of an interaction between Pmm inoculation and cultivar in the absence of a flooding X cultivar interaction indicates true disease resistance and not simply increased flooding tolerance in Oneida. Oneida also showed fewer and less severe root lesions than Iroquois. Flooding increased both the incidence and severity of root lesions. The pathogen, Pmm, could be reisolated from root tissue in which disease symptoms were observed. Redox potentials indicated that anaerobic conditions developed quickly in both soil and vermiculite following flooding and that aerobic conditions were reestablished within one day in both media upon draining. Re~ sistance to Phytophthora root rot is ofvalue on new stands subjected to marginal flooding stress.·----------------

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Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage¹

Mueller¹,

Fick

1987

Agronomy Journal

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Sporangial responses do not reflect microbial suppression of Phytophthora drechsleri in composted eucalyptus bark mix

Hardy

Sivasithamparam

1991

Soil Biology and Biochemistry

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Phytophthora medicaginis (Phytophthora root rot of lucerne)

2022

CABI Compendium

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Phytophthora Root Rot of Alfalfa in Central New York

Cited by 4 publications

References 0 publications

Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage¹

Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage¹

Sporangial responses do not reflect microbial suppression of Phytophthora drechsleri in composted eucalyptus bark mix

Phytophthora medicaginis (Phytophthora root rot of lucerne)

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Phytophthora Root Rot of Alfalfa in Central New York

Cited by 4 publications

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Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage1

Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage1

Sporangial responses do not reflect microbial suppression of Phytophthora drechsleri in composted eucalyptus bark mix

Phytophthora medicaginis (Phytophthora root rot of lucerne)

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Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage¹

Response of Susceptible and Resistant Alfalfa Cultivars to Phytophthora Root Rot in the Absence of Measurable Flooding Damage¹