Abstract：
:> Abstract To determine if spatial variation in soluble carbon sources along the root coincides with different trophic groups of bacteria, copiotrophic and oligotrophic bacteria were enumerated from bulk soil and rhizosphere samples at 2 cm intervals along wheat roots 2, 3, and 4 weeks after planting. There was a moderate rhizosphere effect in one experiment with soil rich in fresh plant debris, and a very pronounced rhizosphere effect in the second experiment with soil low in organic matter. We obtained wavelike patterns of both trophic groups of bacteria as well as water-soluble total organic carbon (TOC) along the whole root length (60 or 90 cm). TOC concentrations were maximal at the root tip and base and minimal in the middle part of the roots. Oscillations in populations of copiotrophic and oligotrophic bacteria had two maxima close to the root tip and at the root base, or three maxima close to the tip, in the middle section, and at the root base. The location and pattern of the waves in bacterial populations changed progressively from week to week and was not consistently correlated with TOC concentrations or the location of lateral root formation. Thus, the traditional view that patterns in bacterial numbers along the root directly reflect patterns in exudation and rhizodeposition from several fixed sources along the root may not be true. We attributed the observed wavelike patterns in bacterial populations to bacterial growth and death cycles (due to autolysis or grazing by predators). Considering the root tip as a moving nutrient source, temporal oscillations in bacterial populations at any location where the root tip passed would result in moving waves along the root. This change in concept about bacterial populations in the rhizosphere could have significant implications for plant growth promotion and bioremediation.
journal_name
Microb Ecoljournal_title
Microbial ecologyauthors
Semenov AM,van Bruggen AHC,Zelenev VVdoi
10.1007/s002489900136subject
Has Abstractpub_date
1999-02-01 00:00:00pages
116-128issue
2eissn
0095-3628issn
1432-184Xpii
MECOJKF98-34journal_volume
37pub_type
杂志文章abstract：:Different experiments have estimated that the contribution of biological nitrogen fixation (BNF) is largely variable among sugarcane cultivars. Which bacteria are the most important in sugarcane-associated BNF is unknown. However, Gluconacetobacter diazotrophicus has been suggested as a strong candidate responsible fo...
journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：2003-11-01 00:00:00
abstract：:With this study, we present first data on the diversity of aerobic methanotrophic bacteria (MOB) in an Arctic permafrost active layer soil of the Lena Delta, Siberia. Applying denaturing gradient gel electrophoresis and cloning of 16S ribosomal ribonucleic acid (rRNA) and pmoA gene fragments of active layer samples, w...
journal_title：Microbial ecology
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doi：10.1007/s00248-008-9411-x
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/s00248-016-0816-7
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/BF02512390
更新日期：1974-12-01 00:00:00
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更新日期：2003-01-01 00:00:00
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更新日期：2009-08-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/s00248-017-0975-1
更新日期：2017-11-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/s00248-018-1187-z
更新日期：2018-11-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：2020-10-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：2009-08-01 00:00:00
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journal_title：Microbial ecology
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doi：10.1007/s00248-020-01506-9
更新日期：2020-08-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/BF00172636
更新日期：1992-06-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/s00248-020-01580-z
更新日期：2021-02-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：2014-05-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/s00248-015-0614-7
更新日期：2015-10-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/s00248-007-9313-3
更新日期：2008-05-01 00:00:00
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journal_title：Microbial ecology
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更新日期：2008-08-01 00:00:00
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更新日期：2008-01-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：1988-01-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：1999-08-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：2006-11-01 00:00:00
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更新日期：2011-10-01 00:00:00
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更新日期：2004-01-01 00:00:00
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pub_type： 杂志文章
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更新日期：2018-01-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
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更新日期：2017-11-01 00:00:00
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journal_title：Microbial ecology
pub_type： 杂志文章
doi：10.1007/s00248-001-1015-7
更新日期：2002-01-01 00:00:00
