Biologia Plantarum

, Volume 50, Issue 3, pp 405–410 | Cite as

Waterlogging effect on xylem sap glutamine of nodulated soybean

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Abstract

Waterlogging of soybean plants (Glycine max L.) led to impaired symbiotic N2 fixation and a marked decline in glutamine (Gln) concentration in xylem bleeding sap. Xylem Gln concentration increased during the growth cycle of the plant and was correlated with nodule formation. Treatments known to impair N2 fixation, such as exposing the root system to pure N2 gas or a mixture of Ar and O2 (80:20; v/v), led to specific declines in xylem sap Gln. The decrease in Gln observed during waterlogging was also seen on transfer of nodulated plants to aerated hydroponics, where the decline was highly correlated with ureide content in the xylem sap. Upon flooding the nodulated root system, the specific decline in xylem sap Gln could be detected within 10 min and reached a minimum within 60 min, indicating that waterlogging has an immediate effect on N2 fixation. It is concluded that xylem Gln arises directly from N2-fixation and is a useful indicator of N2 fixation activity of symbiotic soybean plants.

Aditional key words

Glycine max hypoxia nitrogen fixation nitrogen transport 

Abbreviations

Ala

alanine

Asn

asparagine

Asp

aspartic acid

Gaba

γ-amino butyric acid

Gln

glutamine

Ser

serine

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Copyright information

© Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 2006

Authors and Affiliations

  1. 1.Departamento de Fisiologia Vegetal, Instituto de BiologiaUniversidade Estadual de Campinas, C.P. 6109Campinas - SPBrazil

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