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Why is phloem sap nitrate kept low?

Abstract : It has now been 61 years since phloem sap composition has first been described, using sap extracted from willow (Peel & Weatherley, 1959). In that study, using colorimetric methods, nitrate was found to be undetectable. Several subsequent studies also reported the absence of nitrate in other species such as castor bean (Ricinus communis) (Hall & Baker, 1972) and overviews of phloem sap composition established the generally very low, or undetectable, concentration in phloem sap nitrate (Ziegler, 1975).
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https://hal.inrae.fr/hal-03312617
Contributor : Olivier Dupre <>
Submitted on : Monday, August 2, 2021 - 3:37:40 PM
Last modification on : Tuesday, August 3, 2021 - 3:38:40 AM

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Jing Cui, Andreas Peuke, Anis Limami, Guillaume Tcherkez. Why is phloem sap nitrate kept low?. Plant, Cell and Environment, Wiley, 2021, pp.1-6. ⟨10.1111/pce.14116⟩. ⟨hal-03312617⟩

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