Abstract
Late blight of potato (Solanum tuberosum L.) caused by the oomycete Phytophthora infestans (Mont.) de Bary was studied in respect to the disease resistance induced by Bacillus subtilis Cohn (strains 26D and 11VM) and B. thuringiensis Berliner (strains B-5351 and B-6066) bacteria. The content of hydrogen peroxide, activities of antioxidant (catalases and peroxidases) and hydrolytic (proteases and amylases) enzymes, together with the gene expression of inhibitors of hydrolases, as the parameters related to the resistance, were assessed. The 15-day-old plants of a cv. Rannyaya Rosa susceptible to late blight were derived from microtubers. The plants were sprayed with bacterial suspension (108 cells/mL) of one of the mentioned strains of B. subtilis or B. thuringiensis. After 5 days, part of the plants was inoculated with P. infestans zoospores (105 spores/mL). After 6, 24, or 48 h postinoculation, the plants were fixed for biochemical analyses. It was found that either B. subtilis or B. thuringiensis reduced the late blight severity on the potato leaves; the effect depended on the particular bacterial strain applied. This was apparently a consequence of H2O2 accumulation and increased expression of the genes encoding protease and amylase inhibitors. The transcriptional activity of the genes of hydrolase inhibitors was stimulated by B. subtilis and B. thuringiensis to different extents. This suggests the existence of different strain-dependent pathways of establishment of bacteria-induced potato resistance to P. infestans.
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Claims 7
Claim · model-written summary
B. subtilis reduced late blight severity in potato leaves with strain dependent effect.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- B. subtilise0
- Interactor
- Phytophthora infestans
Phytophthora infestanse1pathogen - Second interactor
- B. subtilis
Bacillus subtilise0biocontrol_agent - Outcome
- late blight severity on the potato leavese0
- Direction
- reducede0
- Qualifier
- effect depended on the particular bacterial strain appliede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“either B. subtilis or B. thuringiensis reduced the late blight severity on the potato leaves; the effect depended on the particular bacterial strain applied.”
e1“Late blight of potato (Solanum tuberosum L.) caused by the oomycete Phytophthora infestans (Mont.) de Bary”
Claim · model-written summary
B. thuringiensis reduced late blight severity in potato leaves with strain dependent effect.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- B. thuringiensise0
- Interactor
- Phytophthora infestansPhytophthora infestanse1pathogen
- Second interactor
- B. thuringiensis
Bacillus thuringiensise0biocontrol_agent - Outcome
- late blight severity on the potato leavese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“either B. subtilis or B. thuringiensis reduced the late blight severity on the potato leaves; the effect depended on the particular bacterial strain applied.”
e1“Late blight of potato (Solanum tuberosum L.) caused by the oomycete Phytophthora infestans (Mont.) de Bary”
Claim · model-written summary
The bacteria induced H2O2 accumulation, apparently contributing to resistance.
- Taxon
- potatoSolanum tuberosume1
- Compound
- H2O2e0
- Outcome
- late blight severity on the potato leavese1
- Qualifier
- apparentlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was apparently a consequence of H2O2 accumulation and increased expression of the genes encoding protease and amylase inhibitors.”
e1“late blight severity on the potato leaves”
Claim · model-written summary
Increased expression of protease and amylase inhibitor genes apparently contributed to resistance.
- Taxon
- potatoSolanum tuberosume1
- Gene
- genes encoding protease and amylase inhibitorse0
- Outcome
- late blight severity on the potato leavese1
- Qualifier
- apparentlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was apparently a consequence of H2O2 accumulation and increased expression of the genes encoding protease and amylase inhibitors.”
e1“late blight severity on the potato leaves”
Claim · model-written summary
B. subtilis stimulated transcriptional activity of hydrolase inhibitor genes.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- B. subtilise0
- Interactor
- B. subtilisBacillus subtilise0biocontrol_agent
- Gene
- genes of hydrolase inhibitorse0
- Outcome
- transcriptional activity of the genes of hydrolase inhibitorse0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transcriptional activity of the genes of hydrolase inhibitors was stimulated by B. subtilis and B. thuringiensis to different extents.”
e1“potato leaves”
Claim · model-written summary
B. thuringiensis stimulated transcriptional activity of hydrolase inhibitor genes.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- B. thuringiensise0
- Interactor
- B. thuringiensisBacillus thuringiensise0biocontrol_agent
- Gene
- genes of hydrolase inhibitorse0
- Outcome
- transcriptional activity of the genes of hydrolase inhibitorse0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transcriptional activity of the genes of hydrolase inhibitors was stimulated by B. subtilis and B. thuringiensis to different extents.”
e1“potato leaves”
Claim · model-written summary
The authors inferred strain dependent pathways of bacteria induced potato resistance.
- Taxon
- potatoSolanum tuberosume0
- Interactor
- P. infestansPhytophthora infestanse0pathogen
- Outcome
- potato resistance to P. infestanse0
- Qualifier
- different strain-dependent pathwayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This suggests the existence of different strain-dependent pathways of establishment of bacteria-induced potato resistance to P. infestans.”
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