JaLCDOI 10.18926/fest/11454
FullText URL 012_107_117.pdf
Author Akhtar M. Shahbaz| Oki, Yoko| Adachi, Tadashi| Khan Md. H. R.|
Abstract Acclimation to orthophosphate (Pi) deprivation via highly coordinated Pi-starvation induced (PSI) classical mechanisms such as copious quantities of H(+) and carboxylates (OAs) exudation, remodeling and modification of root architecture by increasing structural and functional plasticity, enhanced uptake rate and increased synthesis of Pi transporters would reduce or eliminate our current overreliance on expensive, polluting, and nonrenewable Pi-fertilizers. These complicated but elegant morphological, physiological, biochemical and molecular adjustments of Pi-starved plants provide an excellent example of how the unique flexibility of plant metabolism and energy transduction helps them to cope in a typically stressful environment. Pi-starved roots possess enhanced H(+)-ATPase and PEPCase which could result in increasing H(+) efflux and OAs exudations in the root vicinity. This would lead to the rhizosphere acidification, which thereby contribute to the solublization and assimilation of mineral Pi from environment. To visualize the dissolution of sparingly soluble Ca-phosphate and rhizospheric pH changes (in situ), genetically diverse Brassica cultivars were grown on agar media. Newly formed Ca-phosphate was suspended in agar containing other essential nutriens. With NH(4)(+) applied as the N source, the precipitate dissolved in the root vicinity and this was ascribed to acidification. No dissolution was occurred with No(3)(-)-nutrition. In order to observe the pH changes at the media-root interface (rhizosphere), an image analysis was carried out after embedding the roots in agar containing bromocresol purple as pH indicator. Efficient cultivar 'Brown Raya' showed greater decrease in pH than P-inefficient 'B.S.A' in the culture media. Hydroponically grown cultivars were compared with respect to P-utilization efficiency (PUE), P-stress factor (PSF), and Ca- and P-uptake at P-starvation. PUE, and Ca- and P-uptake correlated significantly (P<0.01) with biomass accumulation, indicating that higher P-uptake of efficient cultivars was because of their higher Ca-uptake, which in turn was related to their better P-acquisition and PUE. Remodelling of root architecture of efficient cultivars helped the cultivars to establish a better rooting system, which provided basis for tolerance under P-starvation.
Keywords Brassica Bromocresol purple H(+) -efflux Rhizospheirc pH changes and acidification PUE
Publication Title 岡山大学環境理工学部研究報告
Published Date 2007-03-15
Volume volume12
Issue issue1
Start Page 107
End Page 117
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313432
JaLCDOI 10.18926/fest/11506
FullText URL 010_105_109.pdf
Author Alam Ashraful| Takaguchi, Yutaka| Tsuboi, Sadao|
Abstract Ortho-monobromination of phenols and polyphenols by 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) is described. A simple addition of commercially available DBDMH to phenols and polyphenols in chloroform at room temperature resulted in a good to excellent yield of corresponding ortho-monobromo derivatives.
Keywords ortho-monobromination phenol polyphenol DBDMH
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 105
End Page 109
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313473
Author Faculty of Environmental Science and Technology, Okayama University|
Published Date 2010-03-15
Publication Title 岡山大学環境理工学部研究報告
Volume volume15
Issue issue1
Content Type Others
Author Faculty of Environmental Science and Technology, Okayama University|
Published Date 2010-03-15
Publication Title 岡山大学環境理工学部研究報告
Volume volume15
Issue issue1
Content Type Others
Author Faculty of Environmental Science and Technology, Okayama University|
Published Date 2010-03-15
Publication Title 岡山大学環境理工学部研究報告
Volume volume15
Issue issue1
Content Type Others
Author Faculty of Environmental Science and Technology, Okayama University|
Published Date 2010-03-15
Publication Title 岡山大学環境理工学部研究報告
Volume volume15
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2011-03-18
Publication Title 岡山大学環境理工学部研究報告
Volume volume16
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2011-03-18
Publication Title 岡山大学環境理工学部研究報告
Volume volume16
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2011-03-18
Publication Title 岡山大学環境理工学部研究報告
Volume volume16
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2011-03-18
Publication Title 岡山大学環境理工学部研究報告
Volume volume16
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2012-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume17
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2012-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume17
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2012-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume17
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2012-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume17
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2013-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume18
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2013-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume18
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2013-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume18
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2013-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume18
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2013-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume18
Issue issue1
Content Type Others
Author 岡山大学環境理工学部|
Published Date 2013-03
Publication Title 岡山大学環境理工学部研究報告
Volume volume18
Issue issue1
Content Type Others