Abstract：
:Root hairs expand the effective root surface to increase the uptake of nutrients and water from the soil. Here the local effects of the two major nitrogen sources, ammonium and nitrate, on root hairs were investigated using split plates. In three contrasting accessions of A. thaliana, namely Col-0, Tsu-0 and Sha, root hairs were differentially affected by the nitrogen forms and their concentration. Root hairs in Sha were short in the absence of nitrate. In Col-0, hair length was moderately decreased with increasing nitrate or ammonium. In all accessions, the root hair density was insensitive to 1,000-fold changes in the ammonium concentrations, when supplied locally as the exclusive nitrogen form. In contrast, the root hair density generally increased with nitrate as the exclusive local nitrogen source. The nitrate sensitivity was reduced at mM concentrations in a loss-of-function mutant of the nitrate transporter and sensor gene NRT1;1 (NPF6.3). Little differences with respect to ammonium were found in a mutant lacking four high affinity AMT-type ammonium transporters, but interestingly, the response to high nitrate was reduced and may indicate a general defect in nitrogen signaling in that mutant. Genetic diversity and the presence of the nitrogen transceptor NRT1;1 explain heterogeneity in the responses of root hairs to different nitrogen forms in Arabidopsis accessions.
journal_name
J Plant Resjournal_title
Journal of plant researchauthors
Vatter T,Neuhäuser B,Stetter M,Ludewig Udoi
10.1007/s10265-015-0733-8subject
Has Abstractpub_date
2015-09-01 00:00:00pages
839-48issue
5eissn
0918-9440issn
1618-0860journal_volume
128pub_type
杂志文章abstract：:Light- and nitrogen-use change was examined along productivity gradients in natural grasslands at Laelatu, western Estonia, both at community level and in most abundant species. Aboveground biomass (M) ranged from 341 to 503 g m(-2) in wet (W) and from 248 to 682 g m(-2) in dry (D) community. Aboveground leaf area rat...
journal_title：Journal of plant research
pub_type： 杂志文章
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journal_title：Journal of plant research
pub_type： 杂志文章
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doi：10.1007/s10265-008-0161-0
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-009-0251-7
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doi：10.1007/s10265-007-0086-z
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journal_title：Journal of plant research
pub_type： 杂志文章,评审
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pub_type： 杂志文章,评审
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pub_type： 杂志文章
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-016-0812-5
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doi：10.1007/s10265-005-0222-6
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doi：10.1007/s10265-008-0200-x
更新日期：2009-01-01 00:00:00
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doi：10.1007/s10265-019-01091-0
更新日期：2019-03-01 00:00:00
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pub_type： 杂志文章
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journal_title：Journal of plant research
pub_type： 杂志文章,评审
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