Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 163, Issue 1, Pages 80-85Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.jplph.2005.03.010
Keywords
amino acids; apoplast; endophyte; nitrogen compounds; sugarcane
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Several nitrogen compounds were identified and quantified in the apoplastic and symplastic sap of sugarcane stems. The sap of stems was composed mainly of soluble sugars, which constituted 95% of the total. organic compounds detected. Sap also contained nitrogen compounds, with amino acids (50-70% of N) and proteins (20-30% of N), being the main nitrogenous substances, as welt as inorganic forms as ammonium, nitrite and nitrate, in low concentrations (<20% of N). Serine, proline, atanine and aspartic acid together represented around 60% of the amino acids of the sap of both field grown and high nitrogen fertilized plants, and non-nitrogen fertilized plants inoculated with Gluconacetobacter diazotrophicus. The total amino acid content of apoplastic sap was six to nine times lower in non-nitrogen fertilized plants than in fertilized ones. The possible roles of these substances to regulate endophytic associations with sugarcane are also discussed. (C) 2005 Elsevier GmbH. All rights reserved.
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