Abstract
It is now well established that abscisic acid (ABA) plays a significant role as a stress hormone in higher and lower plants. Abscisic acid is synthesised in plant tissues under stress conditions, released to transport paths such as xylem or phloem and transported to target cells, tissues or organs where it improves the water relations of the plants by acting on stomata (closure) or on roots (increasing hydraulic conductance). An important role of roots has been demonstrated by Blackman and Davies (1985). They performed split root experiments in which half of the roots were adequately watered and half were stressed. Despite of an unchanged leaf water potential, the stomata ofthose plants closed. This was explained by a root to shoot stress signal formed by the stressed roots that was transported to the guard cells and induced stomatal closure.
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Hartung, W., Turner, N.C. (1997). Abscisic Acid Relations in Stressed Roots. In: Altman, A., Waisel, Y. (eds) Biology of Root Formation and Development. Basic Life Sciences, vol 65. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5403-5_20
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DOI: https://doi.org/10.1007/978-1-4615-5403-5_20
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