Effect of potassium on the tolerance to PEG-induced water stress of two white clover varieties (Trifolium repens L.) |
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Authors: | C Robin L Shamsun-Noor A Guckert |
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Institution: | (1) Laboratoire de Phytotechnie-I.N.R.A., E.N.S.A.I.A. 2, avenue de la Forêt de Haye, F-54500 Vandoeuvre Les Nancy, France |
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Abstract: | The response to water stress was studied on white clover grown hydroponically. Two varieties (Crau and Huia) were both subjected
to a moderate and a more-severe stress, induced by polyethylene glycol (10 and 20% respectively), in the presence of a nutrient
solution poor in potassium (K1=0.005 mM), or abundantly supplied (K2=5mM). Dawn water potential and nitrogen fixation (acetylene reduction activity) decreased with the increasing stress. Conversely,
the stomatal resistance increased whenosmoticum was added. Crau had a lower stomatal resistance to the deficit, than did Huia. In relation with the K supply, treatment K2 confirmed the superiority of Crau. Crau also showed greater nodule mass and number than Huia. The data show relationships
between dawn water potential, stomatal resistance and nitrogen fixation activity. |
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Keywords: | nitrogen fixation nodules stomatal resistance water potential |
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