Abstract
The effect of Nilaparvata lugens (Stål) (Homoptera: Delphacidae), infestation on the content of zeatin ribosides (ZR) in rice plants was investigated with enzyme-linked immunosorbent assay. Hydroponics experiments were conducted on 'Zhendao 2' rice, in which plants were subjected to N. lugens infestation at three nonhopperburn-causing densities (15, 30, and 60 nymphs per hill) for 2, 4, 6, and 8 d and at one hopperburn-causing density (240 nymphs per hill) for 2, 4, and 6 d, respectively. When rice plants were infested at the nonhopperburn-causing densities, ZR content in leaves varied significantly with the infestation density. Compared with the control plants, ZR content in rice leaves decreased significantly after infestation by 60 nymphs per hill for 2 d, but it tended to increase due to prolonged infestation at all the nonhopperburn-causing densities. In contrast, ZR content in rice roots significantly reduced after the plants being infested at the density of 15 nymphs for 2 d and at all densities for prolonged duration, except for the plants infested by 60 nymphs for 6 and 8 d, in which the ZR content increased or did not change significantly. However, infestation at the hopperburn-causing density caused significant reduction in ZR content in rice roots, regardless of infestation duration, and in rice leaves from the plants subjected to 2-d infestation. These results are discussed in relation to the possible physiological reaction of rice plants to N. lugens infestation and the resultant severe damage or hopperburn.
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Claims 8
Claim · model-written summary
At nonhopperburn densities, rice leaf ZR content varied significantly with infestation density.
- Taxon
- rice
Oryza sativae0 - Treatment
- infestation densitye0
- Interactor
- Nilaparvata lugens
Nilaparvata lugenst0pest - Outcome
- ZR content in leavese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When rice plants were infested at the nonhopperburn-causing densities, ZR content in leaves varied significantly with the infestation density.”
t0“Nilaparvata lugens”
Claim · model-written summary
Infestation by 60 nymphs per hill for two days significantly reduced leaf ZR versus control.
- Taxon
- riceOryza sativae0
- Treatment
- infestation by 60 nymphs per hill for 2 de0
- Interactor
- Nilaparvata lugensNilaparvata lugenst0pest
- Outcome
- ZR content in rice leavese0
- Direction
- decreasede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the control plants, ZR content in rice leaves decreased significantly after infestation by 60 nymphs per hill for 2 d”
t0“Nilaparvata lugens”
Claim · model-written summary
Prolonged infestation at nonhopperburn densities tended to increase leaf ZR.
- Taxon
- riceOryza sativae1
- Treatment
- prolonged infestation at all the nonhopperburn-causing densitiese0
- Interactor
- Nilaparvata lugensNilaparvata lugenst0pest
- Outcome
- ZR content in rice leavese1
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it tended to increase due to prolonged infestation at all the nonhopperburn-causing densities.”
e1“ZR content in rice leaves”
t0“Nilaparvata lugens”
Claim · model-written summary
Infestation at 15 nymphs for two days significantly reduced root ZR.
- Taxon
- riceOryza sativae0
- Treatment
- infested at the density of 15 nymphs for 2 de0
- Interactor
- Nilaparvata lugensNilaparvata lugenst0pest
- Outcome
- ZR content in rice rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZR content in rice roots significantly reduced after the plants being infested at the density of 15 nymphs for 2 d”
t0“Nilaparvata lugens”
Claim · model-written summary
Prolonged infestation generally reduced root ZR, except at 60 nymphs at six or eight days.
- Taxon
- riceOryza sativae1
- Treatment
- at all densities for prolonged duratione0
- Interactor
- Nilaparvata lugensNilaparvata lugenst0pest
- Outcome
- ZR content in rice rootse1
- Direction
- reducede1
- Qualifier
- except for the plants infested by 60 nymphs for 6 and 8 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at all densities for prolonged duration, except for the plants infested by 60 nymphs for 6 and 8 d, in which the ZR content increased or did not change significantly.”
e1“ZR content in rice roots significantly reduced”
t0“Nilaparvata lugens”
Claim · model-written summary
At 60 nymphs for six or eight days, root ZR increased or did not change significantly.
- Taxon
- riceOryza sativae1
- Organ / stage
- rootse1
- Treatment
- 60 nymphs for 6 and 8 de0
- Interactor
- Nilaparvata lugensNilaparvata lugenst0pest
- Outcome
- ZR contente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants infested by 60 nymphs for 6 and 8 d, in which the ZR content increased or did not change significantly.”
e1“ZR content in rice roots significantly reduced”
t0“Nilaparvata lugens”
Claim · model-written summary
Hopperburn density significantly reduced root ZR regardless of duration.
- Taxon
- riceOryza sativae0
- Treatment
- infestation at the hopperburn-causing densitye0
- Interactor
- Nilaparvata lugensNilaparvata lugenst0pest
- Outcome
- ZR content in rice rootse0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infestation at the hopperburn-causing density caused significant reduction in ZR content in rice roots, regardless of infestation duration”
t0“Nilaparvata lugens”
Claim · model-written summary
Hopperburn density significantly reduced leaf ZR after two days.
- Taxon
- riceOryza sativae0
- Treatment
- infestation at the hopperburn-causing densitye0
- Interactor
- Nilaparvata lugensNilaparvata lugenst0pest
- Outcome
- ZR content in rice leavese1
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infestation at the hopperburn-causing density caused significant reduction in ZR content in rice roots, regardless of infestation duration, and in rice leaves from the plants subjected to 2-d infestation.”
e1“ZR content in rice leaves”
t0“Nilaparvata lugens”
The same questions in other papers
infection · Nilaparvata lugens · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 9 in the opposite direction
- negative
- negative
- no effect
14 papers more in this group
See all 18 papers →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.