Abstract
Bacterial leaf blight (BLB) of rice caused by Xanthomonas oryzae pv. oryzae (Xoo) is a major disease in rice and Pseudomonas fluorescens is known as a successful bioagent against the pathogen. The present investigation was carried out to study the effect of micronutrients, viz. boron (B), iron (Fe), zinc (Zn), and molybdenum (Mo) on the efficacy of the bioagent and induction of defense mechanism in rice. The study revealed that P. fluorescens strain PfAs1 enriched with 50 ppm Zn could suppress the blight pathogen by 45.92% compared to control and other micronutrients under in-vitro condition. The results also demonstrated a reduction of 82.99% disease intensity in rice due to application of Zn enriched PfAs1. Further study was made to understand whether the Zn enriched PfAs1 (Zn PfAs1) induces defense response in rice. The levels of expression of defense related genes, viz. OSPR1a, OSPR1b, OSPR10a, Xa1 and Xa26 against Xoo was quantified by quantitative PCR (qPCR). During the interaction of rice with Zn PfAs1, a 20 fold increase in the expression of rice BLB resistance gene Xa26 and pathogenesis related (PR) gene OsPR1b, was observed when compared with controls. Similarly, 14 and 10 fold increase in levels of expression of OsPR1a and OsPR10a genes was recorded, respectively. An 8 fold increase in the level of expression of Xa1 gene was also recorded in the study. This is the first report on enhanced defense response in rice due to the antagonistic potential of Zn enriched P. fluorescens strain against BLB pathogen.
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Claims 6
Claim · model-written summary
P. fluorescens PfAs1 enriched with 50 ppm Zn suppressed the blight pathogen by 45.92% in vitro.
- Taxon
- rice
Oryza sativat0 - Treatment
- P. fluorescens strain PfAs1 enriched with 50 ppm Zne1
- Interactor
- Xanthomonas oryzae pv. oryzae
Xanthomonas oryzae pv. oryzaee0pathogen - Second interactor
- P. fluorescens strain PfAs1
.JPG?width=60)
Pseudomonas fluorescense1biocontrol_agent - Outcome
- suppress the blight pathogene1
- Direction
- suppresse1
- Value
- 45.92%e1
- Comparator
- control and other micronutrientse1
- Setting
- in-vitro conditione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
t0“triggered defense response in rice against bacterial leaf blight”
e0“caused by Xanthomonas oryzae pv. oryzae (Xoo)”
e1“The study revealed that P. fluorescens strain PfAs1 enriched with 50 ppm Zn could suppress the blight pathogen by 45.92% compared to control and other micronutrients under in-vitro condition”
Claim · model-written summary
Zn-enriched PfAs1 reduced rice bacterial leaf blight disease intensity by 82.99%.
- Taxon
- riceOryza sativae2
- Treatment
- application of Zn enriched PfAs1e2
- Interactor
- Xanthomonas oryzae pv. oryzaeXanthomonas oryzae pv. oryzaee0pathogen
- Second interactor
- PfAs1e2biocontrol_agent
- Outcome
- disease intensitye2
- Direction
- reductione2
- Value
- 82.99%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused by Xanthomonas oryzae pv. oryzae (Xoo)”
e2“The results also demonstrated a reduction of 82.99% disease intensity in rice due to application of Zn enriched PfAs1”
Claim · model-written summary
Zn PfAs1 increased expression of the rice resistance gene Xa26 20-fold.
- Taxon
- riceOryza sativae3
- Treatment
- Zn PfAs1e3
- Gene
- Xa26e3
- Outcome
- expression of rice BLB resistance gene Xa26e3
- Direction
- increasee3
- Value
- 20 folde3
- Comparator
- controlse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused by Xanthomonas oryzae pv. oryzae (Xoo)”
e3“During the interaction of rice with Zn PfAs1, a 20 fold increase in the expression of rice BLB resistance gene Xa26 and pathogenesis related (PR) gene OsPR1b, was observed when compared with controls”
Claim · model-written summary
Zn PfAs1 increased expression of the pathogenesis-related gene OsPR1b 20-fold in rice.
- Taxon
- riceOryza sativae3
- Treatment
- Zn PfAs1e3
- Gene
- OsPR1be3
- Outcome
- pathogenesis related (PR) gene OsPR1be3
- Direction
- increasee3
- Value
- 20 folde3
- Comparator
- controlse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused by Xanthomonas oryzae pv. oryzae (Xoo)”
e3“During the interaction of rice with Zn PfAs1, a 20 fold increase in the expression of rice BLB resistance gene Xa26 and pathogenesis related (PR) gene OsPR1b, was observed when compared with controls”
Claim · model-written summary
Zn PfAs1 increased expression of OsPR1a and OsPR10a in rice, 14 and 10 fold respectively.
- Taxon
- riceOryza sativae3
- Treatment
- Zn PfAs1e3
- Gene
- OsPR1a and OsPR10ae5
- Outcome
- levels of expression of OsPR1a and OsPR10a genese5
- Direction
- increasee5
- Value
- 14 and 10 folde5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused by Xanthomonas oryzae pv. oryzae (Xoo)”
e3“During the interaction of rice with Zn PfAs1, a 20 fold increase in the expression of rice BLB resistance gene Xa26 and pathogenesis related (PR) gene OsPR1b, was observed when compared with controls”
e5“Similarly, 14 and 10 fold increase in levels of expression of OsPR1a and OsPR10a genes was recorded, respectively”
Claim · model-written summary
Zn PfAs1 increased expression of Xa1 in rice 8-fold.
- Taxon
- riceOryza sativae3
- Treatment
- Zn PfAs1e3
- Gene
- Xa1e6
- Outcome
- level of expression of Xa1 genee6
- Direction
- increasee6
- Value
- 8 folde6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused by Xanthomonas oryzae pv. oryzae (Xoo)”
e3“During the interaction of rice with Zn PfAs1, a 20 fold increase in the expression of rice BLB resistance gene Xa26 and pathogenesis related (PR) gene OsPR1b, was observed when compared with controls”
e6“An 8 fold increase in the level of expression of Xa1 gene was also recorded in the study”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.