Abstract：
:Hydroponically grown spinach plants were deprived of an external source of sulphate after an initial period when the S-supply was sufficient. The time-course of events following this treatment was monitored. The first responses were found in the uptake and translocation of NO(3)(-) and the uptake of SO(4)(2-). The former declined by approximately 50%, the effect being most significant at higher [NO(3)(-)](ext.) while the latter increased 6-fold over a 4 d period. Growth in the absence of external SO(4)(2-) resulted in exhaustion of internal SO(4)(2-) pools, the effect being seen first in roots, then in young leaves and, after a marked delay, in mature leaves. In young leaves, there were dramatic increases in the [NO(3)(-)] and the content of arginine in the first 2 d of S-deprivation. The concentration of glutamine, the most abundant amino acid in S-sufficient conditions, also more than doubled in S-deficient young leaves. The changes in arginine levels were also found in older leaves, but the change in glutamine level was not seen. Assays of nitrate reductase activity (NRA) and nitrate reductase (NR) mRNA from young leaves of S-replete and S-deprived plants revealed a divergence in activity and content only late in the experiments (between days 4 and 8) when results were expressed on a unit leaf basis. However, there were also time-dependent changes in the protein content that kept the specific activities (NRA:protein and RNA:protein) more or less unchanged. The results imply that the impact of S-deficiency on N-utilization are more sensitively monitored by simple measurements of the chemical composition of young leaves than by measurements of NRA or NR transcript abundance. They also suggest that protein synthesis in young leaves is strongly dependent on a continuous supply of SO(4)(2-) from outside the plant.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Prosser IM,Purves JV,Saker LR,Clarkson DTkeywords:
subject
Has Abstractpub_date
2001-01-01 00:00:00pages
113-21issue
354eissn
0022-0957issn
1460-2431journal_volume
52pub_type
杂志文章abstract：:The phloem is a well-known target of sucking and piercing insects that utilize the transported fluid as their major nutrient source. In addition to small molecules like sugars and amino acids, phloem sap of higher land plants contains proteins that can accumulate up to high concentrations. Although the knowledge about...
journal_title：Journal of experimental botany
pub_type： 杂志文章,评审
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更新日期：2006-01-01 00:00:00
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journal_title：Journal of experimental botany
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更新日期：2016-03-01 00:00:00
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journal_title：Journal of experimental botany
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journal_title：Journal of experimental botany
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journal_title：Journal of experimental botany
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journal_title：Journal of experimental botany
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2014-07-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2020-05-30 00:00:00
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journal_title：Journal of experimental botany
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doi：10.1093/jxb/eraa337
更新日期：2020-10-22 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2019-10-24 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章,评审
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更新日期：2017-06-15 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章,评审
doi：10.1093/jxb/erv083
更新日期：2015-05-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jexbot/53.367.361
更新日期：2002-02-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2016-08-01 00:00:00
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journal_title：Journal of experimental botany
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doi：10.1093/jxb/erq168
更新日期：2010-07-01 00:00:00
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journal_title：Journal of experimental botany
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journal_title：Journal of experimental botany
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doi：10.1093/jexbot/51.353.1961
更新日期：2000-12-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2019-08-07 00:00:00
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journal_title：Journal of experimental botany
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更新日期：2019-03-27 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2003-11-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/erp165
更新日期：2009-01-01 00:00:00
abstract：:Iron is an essential element for all living organisms due to its ubiquitous role in redox and other enzymes, especially in the context of respiration and photosynthesis. The iron uptake and storage systems of terrestrial/higher plants are now reasonably well understood, with two basic strategies for iron uptake being ...
journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/ers225
更新日期：2012-10-01 00:00:00
abstract：:During the Green Revolution, substantial increases in wheat (Triticum aestivum) yields were realized, at least in part, through the introduction of the Reduced height (Rht)-B1b and Rht-D1b semi-dwarfing alleles. In contrast to Rht-B1b and Rht-D1b, the Rht-B1c allele is characterized by extreme dwarfism and exceptional...
journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/erw471
更新日期：2017-01-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/erw432
更新日期：2017-01-01 00:00:00
abstract：:The plant root system is important for the uptake of water and nutrients and the anchoring of plants in the soil. Lateral roots (LRs) contribute considerably to root system architecture. Their post-embryonic formation is regulated by hormones and environmental cues. The hormone cytokinin influences LR formation and gr...
journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/ert291
更新日期：2013-11-01 00:00:00
