Abstract:
:Xylem sap primarily transports water and mineral nutrients such as nitrogen (N) from roots to shoots in vascular plants. However, it remains largely unknown how nitrogenous compounds, especially proteins in xylem sap, respond to N under- or over-supply. We found that reducing N supply increased amino-N percentage of total N in maize (Zea mays L.) xylem sap. Proteomic analysis showed that 23 proteins in the xylem sap of maize plants, including 12 newly identified ones, differentially accumulated in response to various N supplies. Fifteen of these 23 proteins were primarily involved in general abiotic or biotic stress responses, whereas the other five proteins appeared to respond largely to N under- or over-supply, suggesting distinct protein responses in maize xylem upon N under- and over-supply. Furthermore, one putative xylanase inhibitor and two putative O-glycosyl hydrolases had preferential gene expression in shoots.
journal_name
J Integr Plant Bioljournal_title
Journal of integrative plant biologyauthors
Liao C,Liu R,Zhang F,Li C,Li Xdoi
10.1111/j.1744-7909.2012.01122.xsubject
Has Abstractpub_date
2012-06-01 00:00:00pages
374-87issue
6eissn
1672-9072issn
1744-7909journal_volume
54pub_type
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