Abstract
Onion white rot disease ( Sclerotium cepivorum ) is a serious production problem throughout the world. Very low pathogen level in the soil can cause significant loss. Generic integrated pest management programs include clean seed, site selection, sanitation, crop rotation, biological and chemical controls, crop resistance to the pest, and other components. Onion white rot disease management currently does not have crop resistance as a component. The lack of resistant germplasm and/or the inability to identify and screen potentially resistant germplasm are primary reasons. Research was conducted to determine if field screening for resistance is feasible, to define field screening methodology, and to identify and/or quantify resistance. Disease incidence was inconsistent from year to year. In some years, disease expression was high; in others, disease was low. Uniform pathogen level and disease expression throughout the experimental field were required for successful screening. Results provide evidence that “resistant” or “tolerant” germplasm does exist, and that disease “resistance”, “tolerance”, or “susceptibility” can vary from slight to strong, suggesting multigenic involvement. “Resistance”/”tolerance” was identified in long-day yellow hybrids and inbreds. `Southport White Globe' selections and derivatives had much higher disease susceptibility than yellow or brown skin lines screened.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Onion white rot incidence varied across years.
- Taxon
- Onion
Allium cepat0 - Outcome
- Disease incidencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease incidence was inconsistent from year to year.”
t0“Onion”
Claim · model-written summary
Uniform pathogen level and disease expression were required for successful onion screening.
- Taxon
- OnionAllium cepat0
- Outcome
- successful screeninge0
- Qualifier
- Uniform pathogen level and disease expressione0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uniform pathogen level and disease expression throughout the experimental field were required for successful screening.”
t0“Onion”
Claim · model-written summary
Field screening found resistant or tolerant onion germplasm.
- Taxon
- OnionAllium cepat0
- Outcome
- “resistant” or “tolerant” germplasme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0““resistant” or “tolerant” germplasm does exist”
t0“Onion”
Claim · model-written summary
Onion disease resistance, tolerance, and susceptibility ranged from slight to strong.
- Taxon
- OnionAllium cepat0
- Outcome
- disease “resistance”, “tolerance”, or “susceptibility”e0
- Qualifier
- slight to stronge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disease “resistance”, “tolerance”, or “susceptibility” can vary from slight to strong”
t0“Onion”
Claim · model-written summary
The variation in onion white rot response suggested multigenic involvement.
- Taxon
- OnionAllium cepat0
- Outcome
- White Rot Resistancet0
- Qualifier
- multigenic involvemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting multigenic involvement”
t0“Onion White Rot Resistance”
Claim · model-written summary
Resistance or tolerance was found in long-day yellow onion hybrids.
- Taxon
- OnionAllium cepat0
- Material
- long-day yellow hybridse0
- Outcome
- “Resistance”/”tolerance”e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0““Resistance”/”tolerance” was identified in long-day yellow hybrids and inbreds.”
t0“Onion”
Claim · model-written summary
Resistance or tolerance was found in long-day yellow onion inbreds.
- Taxon
- OnionAllium cepat0
- Material
- inbredse0
- Outcome
- “Resistance”/”tolerance”e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0““Resistance”/”tolerance” was identified in long-day yellow hybrids and inbreds.”
t0“Onion”
Claim · model-written summary
Southport White Globe selections and derivatives had much higher onion disease susceptibility than yellow or brown skin lines.
- Taxon
- OnionAllium cepat0
- Material
- `Southport White Globe' selections and derivativese0
- Outcome
- disease susceptibilitye0
- Direction
- much highere0
- Comparator
- yellow or brown skin linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“`Southport White Globe' selections and derivatives had much higher disease susceptibility than yellow or brown skin lines screened.”
t0“Onion”