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Root-shoot signalling in sunflower plants with confined root systems

M. Ternesi, A.P. Andrade, J. Jorrin and M. Benlloch
Plant and Soil
Vol. 166, No. 1 (1994), pp. 31-36
Published by: Springer
Stable URL: http://www.jstor.org/stable/42939821
Page Count: 6
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Root-shoot signalling in sunflower plants with confined root systems
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Abstract

Sunflower plants were grown hydroponically under controlled conditions with the root systems confined in small containers. Root confinement inhibited the growth of sunflower plants as indicated by reduction in both leaf and cotyledon area and root and shoot fresh weight. This effect was more pronounced in shoots. Root confinement favored the accumulation of potassium in the roots and shoots, and the exudation of potassium and water in excised roots. Xylem sap from root confined plants inhibited cotyledon expansion as revealed by bioassay with decapited sunflower seedlings. In addition decapited control plants incubated in ABA solution also showed cotyledon growth reduction. Xylem sap ABA analysis indicated a 7-times higher concentration in root confined than control plants. Our results suggest the synthesis of a chemical signal in the roots of plants subjected to mechanical stress which can be responsible for the inhibition of plant growth.

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