Abstract
Summary: In spite of a large number of reports on the effects of cytokinin application on growth of wheat, barley and other crops, the impact of it on rice growth has rarely been investigated. The objective of this study was to examine the effects of benzylaminopurine (BA) on shoot and root development and growth of rice plants. Rice (Oryza sativa L. cv. North Rose) was grown in hydroponics under all NH4+, all NO3– and an equal mixture of both forms. From the 6th leaf stage on, 100μ M BA was sprayed to the shoot once every two days for a total of 5 times. BA spray inhibited the development and growth of plant age, plant length, leaf blade length and the root as a whole with the exception that the length of adventitious roots was increased by BA in NH4+-N-grown plants. BA spray also decreased the dry-matter production of both the shoot and root. Single NH4+-N inhibited the shoot and root development and growth compared with N03""-containing N sources. BA counteracted to some extent the inhibitory effect of NH4+-N on plant length, average adventitious root length and the longest adventitious root length. We concluded that 100μM BA spray basically inhibited the shoot and root growth and development of rice (cv. North Rose) grown in hydroponics, but the effects on shoot development are temporary and the treated plants attain or exceed the development of the control plants while the inhibited development of the root did not recover within the experiment period.
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Claims 8
Claim · model-written summary
BA inhibited plant age, plant length, and leaf blade length.
- Taxon
- Rice
Oryza sativat0 - Material
- cv. North Roset0
- Treatment
- BA spraye0
- Outcome
- plant age, plant length, leaf blade lengthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“BA spray inhibited the development and growth of plant age, plant length, leaf blade length and the root as a whole”
Claim · model-written summary
BA inhibited root development and growth overall.
- Taxon
- RiceOryza sativat0
- Material
- cv. North Roset0
- Treatment
- BA spraye0
- Outcome
- root as a wholee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“BA spray inhibited the development and growth of plant age, plant length, leaf blade length and the root as a whole”
Claim · model-written summary
BA increased adventitious root length in ammonium-grown plants.
- Taxon
- RiceOryza sativat0
- Material
- cv. North Roset0
- Treatment
- BAe0
- Outcome
- length of adventitious rootse0
- Direction
- increasede0
- Qualifier
- NH4+-N-grown plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“the length of adventitious roots was increased by BA in NH4+-N-grown plants”
Claim · model-written summary
BA decreased shoot dry-matter production.
- Taxon
- RiceOryza sativat0
- Treatment
- BA spraye0
- Outcome
- dry-matter production of both the shoot and roote0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“BA spray also decreased the dry-matter production of both the shoot and root.”
Claim · model-written summary
Ammonium alone inhibited shoot and root growth versus nitrate-containing sources.
- Taxon
- RiceOryza sativat0
- Treatment
- Single NH4+-Ne0
- Outcome
- shoot and root development and growthe0
- Direction
- inhibitede0
- Comparator
- N03""-containing N sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“Single NH4+-N inhibited the shoot and root development and growth compared with N03""-containing N sources.”
Claim · model-written summary
BA partially counteracted ammonium inhibition of plant length and adventitious root lengths.
- Taxon
- RiceOryza sativat0
- Treatment
- BAe0
- Outcome
- plant length, average adventitious root length and the longest adventitious root lengthe0
- Direction
- counteractede0
- Qualifier
- to some extente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“BA counteracted to some extent the inhibitory effect of NH4+-N on plant length, average adventitious root length and the longest adventitious root length.”
Claim · model-written summary
Shoot development recovered to control level or above after BA treatment.
- Taxon
- RiceOryza sativat0
- Treatment
- treated plantse0
- Outcome
- developmente0
- Direction
- attain or exceede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“the treated plants attain or exceed the development of the control plants”
Claim · model-written summary
BA-inhibited root development did not recover during the experiment.
- Taxon
- RiceOryza sativat0
- Outcome
- development of the roote0
- Direction
- did not recovere0
- Qualifier
- within the experiment periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (cv. North Rose)”
e0“the inhibited development of the root did not recover within the experiment period”
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