Abstract
The pentose phosphate pathway (PPP) plays an important role in plant growth and development, and plant responses to biotic and abiotic stresses. Yet, whether the PPP regulates plant defenses against herbivorous insects remains unclear. In this study, we cloned a rice cytosolic 6-phosphogluconate dehydrogenase gene, Os6PGDH1, which encodes the key enzyme catalyzing the third step in the reaction involving the oxidative phase of the PPP, and explored its role in rice defenses induced by brown planthopper (BPH) Nilaparvata lugens. Levels of Os6PGDH1 transcripts were detected in all five examined tissues, with the highest in outer leaf sheaths and lowest in inner leaf sheaths. Os6PGDH1 expression was strongly induced by mechanical wounding, infestation of gravid BPH females, and jasmonic acid (JA) treatment. Overexpressing Os6PGDH1 (oe6PGDH) decreased the height of rice plants and the mass of the aboveground part of plants, but slightly increased the length of plant roots. In addition, the overexpression of Os6PGDH1 enhanced levels of BPH-induced JA, jasmonoyl-isoleucine (JA-Ile), and H2O2, but decreased BPH-induced levels of ethylene. Bioassays revealed that gravid BPH females preferred to feed and lay eggs on wild-type (WT) plants over oe6PGDH plants; moreover, the hatching rate of BPH eggs raised on oe6PGDH plants and the fecundity of BPH females fed on these were significantly lower than the eggs and the females raised and fed on WT plants. Taken together, these results indicate that Os6PGDH1 plays a pivotal role not only in rice growth but also in the resistance of rice to BPH by modulating JA, ethylene, and H2O2 pathways.
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Claims 11
Claim · model-written summary
Os6PGDH1 transcript levels were highest in outer leaf sheaths and lowest in inner leaf sheaths.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- outer leaf sheathse0
- Gene
- Os6PGDH1e0
- Outcome
- Levels of Os6PGDH1 transcriptse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of Os6PGDH1 transcripts were detected in all five examined tissues, with the highest in outer leaf sheaths and lowest in inner leaf sheaths.”
t0“Rice”
Claim · model-written summary
Mechanical wounding induced Os6PGDH1 expression.
- Taxon
- RiceOryza sativat0
- Treatment
- mechanical woundinge0
- Gene
- Os6PGDH1e0
- Outcome
- Os6PGDH1 expressione0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Os6PGDH1 expression was strongly induced by mechanical wounding”
t0“Rice”
Claim · model-written summary
Gravid BPH infestation induced Os6PGDH1 expression.
- Taxon
- RiceOryza sativat0
- Treatment
- infestation of gravid BPH femalese0
- Interactor
- BPHe0pest
- Gene
- Os6PGDH1e0
- Outcome
- Os6PGDH1 expressione0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Os6PGDH1 expression was strongly induced by mechanical wounding, infestation of gravid BPH females, and jasmonic acid (JA) treatment.”
t0“Rice”
Claim · model-written summary
JA treatment induced Os6PGDH1 expression.
- Taxon
- RiceOryza sativat0
- Treatment
- jasmonic acid (JA) treatmente0
- Gene
- Os6PGDH1e0
- Outcome
- Os6PGDH1 expressione0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Os6PGDH1 expression was strongly induced by mechanical wounding, infestation of gravid BPH females, and jasmonic acid (JA) treatment.”
t0“Rice”
Claim · model-written summary
Os6PGDH1 overexpression decreased rice height and aboveground mass.
- Taxon
- RiceOryza sativat0
- Treatment
- Overexpressing Os6PGDH1e0
- Gene
- Os6PGDH1e0
- Outcome
- height of rice plants and the mass of the aboveground part of plantse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overexpressing Os6PGDH1 (oe6PGDH) decreased the height of rice plants and the mass of the aboveground part of plants”
t0“Rice”
Claim · model-written summary
Os6PGDH1 overexpression slightly increased root length.
- Taxon
- RiceOryza sativat0
- Treatment
- Overexpressing Os6PGDH1e0
- Gene
- Os6PGDH1e0
- Outcome
- length of plant rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overexpressing Os6PGDH1 (oe6PGDH) decreased the height of rice plants and the mass of the aboveground part of plants, but slightly increased the length of plant roots.”
t0“Rice”
Claim · model-written summary
Os6PGDH1 overexpression enhanced BPH-induced JA, JA-Ile and H2O2 levels.
- Taxon
- RiceOryza sativat0
- Treatment
- overexpression of Os6PGDH1e0
- Interactor
- BPHe0pest
- Gene
- Os6PGDH1e0
- Outcome
- levels of BPH-induced JA, jasmonoyl-isoleucine (JA-Ile), and H2O2e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the overexpression of Os6PGDH1 enhanced levels of BPH-induced JA, jasmonoyl-isoleucine (JA-Ile), and H2O2”
t0“Rice”
Claim · model-written summary
Os6PGDH1 overexpression decreased BPH-induced ethylene levels.
- Taxon
- RiceOryza sativat0
- Treatment
- overexpression of Os6PGDH1e0
- Interactor
- BPHe0pest
- Gene
- Os6PGDH1e0
- Outcome
- BPH-induced levels of ethylenee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the overexpression of Os6PGDH1 enhanced levels of BPH-induced JA, jasmonoyl-isoleucine (JA-Ile), and H2O2, but decreased BPH-induced levels of ethylene.”
t0“Rice”
Claim · model-written summary
Gravid BPH females preferred feeding and oviposition on wild-type plants over oe6PGDH plants.
- Taxon
- RiceOryza sativat0
- Material
- oe6PGDH plantse0
- Interactor
- BPHe0pest
- Outcome
- preferred to feed and lay eggse0
- Comparator
- wild-type (WT) plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gravid BPH females preferred to feed and lay eggs on wild-type (WT) plants over oe6PGDH plants”
t0“Rice”
Claim · model-written summary
BPH egg hatching rate on oe6PGDH plants was significantly lower than on WT plants.
- Taxon
- RiceOryza sativat0
- Material
- oe6PGDH plantse0
- Treatment
- oe6PGDH plantse0
- Interactor
- BPHe0pest
- Outcome
- hatching rate of BPH eggse0
- Direction
- lowere0
- Comparator
- WT plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hatching rate of BPH eggs raised on oe6PGDH plants and the fecundity of BPH females fed on these were significantly lower than the eggs and the females raised and fed on WT plants”
t0“Rice”
Claim · model-written summary
BPH female fecundity on oe6PGDH plants was significantly lower than on WT plants.
- Taxon
- RiceOryza sativat0
- Material
- oe6PGDH plantse0
- Treatment
- oe6PGDH plantse0
- Interactor
- BPHe0pest
- Outcome
- fecundity of BPH femalese0
- Direction
- lowere0
- Comparator
- WT plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hatching rate of BPH eggs raised on oe6PGDH plants and the fecundity of BPH females fed on these were significantly lower than the eggs and the females raised and fed on WT plants”
t0“Rice”
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