Temporal differences in plant growth and root exudation of two Brachiaria grasses in response to low phosphorus supply
dc.contributor.author
Louw-Gaume, Anna E.
dc.contributor.author
Schweizer, Noel
dc.contributor.author
Rao, Idupulapati M.
dc.contributor.author
Gaume, Alain J.
dc.contributor.author
Frossard, Emmanuel
dc.date.accessioned
2021-03-01T13:20:05Z
dc.date.available
2017-10-19T01:59:41Z
dc.date.available
2018-01-03T17:02:51Z
dc.date.available
2018-01-26T12:47:17Z
dc.date.available
2021-03-01T13:20:05Z
dc.date.issued
2017
dc.identifier.issn
2346-3775
dc.identifier.other
10.17138/TGFT(5)103-116
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/197653
dc.identifier.doi
10.3929/ethz-b-000197653
dc.description.abstract
Exploiting the natural variability of Brachiaria forage germplasm to identify forage grasses adapted to infertile acid soils that contain very low available phosphorus (P) is an important research objective for improving livestock production in the tropics. The objective of this study was to determine the differences in the release of root biochemical markers, i.e. carboxylates and acid phosphatases (APases), during the development of P deficiency in signalgrass and ruzigrass. We used the hydroxyapatite pouch system in hydroponics to simulate conditions of low P supply in acid soils to test the response of well-adapted signalgrass (Brachiaria decumbens cv. Basilisk, CIAT 606) and less-adapted ruzigrass (B. ruziziensis cv. Kennedy, CIAT 654). We monitored shoot and root growth and other physiological and biochemical components that are important for root functionality at weekly intervals for 3 weeks. We found that monocarboxylate exudation was not associated with the plant’s physiological P status, while exudation of oxalate and secreted-APases increased with declining plant P concentrations in both grasses. Ruzigrass showed higher exudation rates and grew faster than signalgrass, but could not maintain its initial fast growth rate when P concentrations in plant tissue declined to 1.0 mg P/g dry matter. Oxalate was the dominant exuded carboxylate for signalgrass after 21 days of growth and this response might confer some eco-physiological advantages in signalgrass when grown in low-P acid soils.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
CIAT
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-sa/3.0/
dc.subject
Acid phosphatases
en_US
dc.subject
Leaf expansion
en_US
dc.subject
oxalate
en_US
dc.subject
phosphate uptake and use
en_US
dc.subject
Root elongation
en_US
dc.title
Temporal differences in plant growth and root exudation of two Brachiaria grasses in response to low phosphorus supply
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported
dc.date.published
2017-09-30
ethz.journal.title
Tropical Grasslands - Forrajes Tropicales
ethz.journal.volume
5
en_US
ethz.journal.issue
3
en_US
ethz.pages.start
103
en_US
ethz.pages.end
116
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Palmira, Colombia
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-10-19T01:59:44Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-01-26T12:47:21Z
ethz.rosetta.lastUpdated
2022-03-29T05:30:59Z
ethz.rosetta.versionExported
true
ethz.COinS
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