Interessant..
Until recently, the control of plant growth and development was believed to be coordinated by a range of plant growth regulators, such as auxins that stimulate root growth and cytokinins that stimulate vegetative growth (Percival and Gerritsen 1998). Recent evidence has, however, shown that in plants, sugars such as sucrose, glucose, and fructose function not only as substrates for growth but affect sugar- sensing systems that initiate changes in gene expression and subsequent plant growth (Koch 1996). Sugar depletion, for example, upregulates genes for photosynthesis, carbon remobilization, and export, resulting in vegetative or shoot growth. In contrast, incubation of root systems in sugar solutions (i.e., sucrose or glucose) leads to the repression of photosynthetic genes, decreased rates of net photosynthesis, and carbon remobilization in favor of enhanced root development (Koch 1996; Martin et al. 1997). Further, supplementing wheat root systems with sugars (i.e., sucrose, glucose, or fructose) significantly increases lateral root branching and root formation compared with controls (Bingham and Stevenson 1993; Bingham et al. 1997, 1998).
Use of Sugars to Improve Root Growth and Increase Transplant Success of Birch (Betula Pendula Roth.)
Journal of Arboriculture & Urban Forestry
Authors: Glynn C. Percival and Gillian A. Fraser
Keywords: Carbohydrates; resource allocation; gene expression; transplant shock; chlorophyll fluorescence; photosynthesis; chlorophyll; carotenoid; plant vitality
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