Abstract
Three field trials were conducted over a 2-year period to determine the capacity of plant growth-promoting rhizobacteria (PGPR) to induce systemic resistance against cucumber diseases, which was previously observed in the greenhouse. PGPR were applied as seed treatments alone or as seed treatments plus a soil drench at transplanting. Induced systemic resistance (ISR) activity, measured by significant reductions in the severity of angular leaf spot challenge-inoculated with Pseudomonas syringae pv. lachrymans on cucumber, occurred with three of three PGPR strains in 1992, with three of four strains in the first trial in 1993, and with four of four strains in the second trial in 1993. Most PGPR treatments also resulted in significant protection from naturally occurring anthracnose (Colletotrichum orbiculare), while ISR controls (plants previously inoculated with C. orbiculare) had a significantly greater incidence of anthracnose compared with nontreated controls. In all three trials, most PGPR strains (with the exception of one strain) significantly promoted early-season plant growth, as measured by length of the main runner and number of leaves per plant. Yield (cumulative fruit weight) was significantly increased by two of three PGPR strains in 1992, two of four strains in the first 1993 trial, and three of four strains in the second 1993 trial compared with nontreated controls. In contrast, the ISR control had no significant effect on promotion of early-season plant growth or yield compared with nontreated controls. These results demonstrated that PGPR-mediated ISR was operative under field conditions with consistent effects against challenge-inoculated angular leaf spot and naturally occurring anthracnose, along with significant effects on early-season plant growth promotion and yield enhancement.
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Claims 6
Claim · model-written summary
PGPR reduced angular leaf spot severity in all three trials, with three of three, three of four, and four of four strains active.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- PGPRe1
- Interactor
- Pseudomonas syringae pv. lachrymansPseudomonas amygdali pv. lachrymanse0pathogen
- Outcome
- severity of angular leaf spote0
- Direction
- reductionse0
- Qualifier
- three of three PGPR strains in 1992, with three of four strains in the first trial in 1993, and with four of four strains in the second trial in 1993e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant reductions in the severity of angular leaf spot challenge-inoculated with Pseudomonas syringae pv. lachrymans on cucumber, occurred with three of three PGPR strains in 1992, with three of four strains in the first trial in 1993, and with four of four strains in the second trial in 1993”
e1“PGPR were applied as seed treatments alone or as seed treatments plus a soil drench at transplanting”
Claim · model-written summary
Most PGPR treatments significantly protected cucumber against naturally occurring anthracnose.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- PGPR treatmentse0
- Interactor
- Colletotrichum orbiculare
Colletotrichum orbicularee0pathogen - Outcome
- naturally occurring anthracnosee0
- Direction
- protectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most PGPR treatments also resulted in significant protection from naturally occurring anthracnose (Colletotrichum orbiculare)”
e1“on cucumber”
Claim · model-written summary
ISR controls had significantly greater anthracnose incidence than nontreated controls.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- plants previously inoculated with C. orbicularee0
- Interactor
- C. orbiculareColletotrichum orbicularee0pathogen
- Outcome
- incidence of anthracnosee0
- Direction
- greatere0
- Comparator
- nontreated controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ISR controls (plants previously inoculated with C. orbiculare) had a significantly greater incidence of anthracnose compared with nontreated controls”
e1“on cucumber”
Claim · model-written summary
Most PGPR strains significantly increased early-season cucumber growth measured by runner length and leaf number.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- PGPR strainse0
- Outcome
- length of the main runner and number of leaves per plante0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most PGPR strains (with the exception of one strain) significantly promoted early-season plant growth, as measured by length of the main runner and number of leaves per plant”
e1“on cucumber”
Claim · model-written summary
PGPR increased cucumber cumulative fruit weight in two of three strains in 1992, two of four in the first 1993 trial, and three of four in the second.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- PGPR strainse0
- Outcome
- cumulative fruit weighte0
- Direction
- increasede0
- Qualifier
- two of three PGPR strains in 1992, two of four strains in the first 1993 trial, and three of four strains in the second 1993 triale0
- Comparator
- nontreated controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield (cumulative fruit weight) was significantly increased by two of three PGPR strains in 1992, two of four strains in the first 1993 trial, and three of four strains in the second 1993 trial compared with nontreated controls”
e1“on cucumber”
Claim · model-written summary
ISR control did not significantly change early-season cucumber growth or yield.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- ISR controle0
- Outcome
- early-season plant growth or yielde0
- Comparator
- nontreated controlse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ISR control had no significant effect on promotion of early-season plant growth or yield compared with nontreated controls”
e1“on cucumber”
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