27 / 09 / 2010

Gibberellins and Abscisic Acid Promote Carbon Allocation in Roots and Berries of Grapevines

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Por: Daniela Moreno o Federico J. Berli o Patricia N. Piccoli o Rubén Bottini. En: J Plant Growth Regul (2011) 30:220-228.

Carbon allocation within grapevines may affect berry growth and development. The plant hormones gibberellins (GAs) and abscisic acid (ABA) control various processes across the plant life and both have been involved in assimilate production and transport in different species. Hence, this work examined the distribution of sugars (sucrose, fructose, and glucose) and starch in grapevines at veraison after foliar applications of GA3, ABA, and an inhibitor of GA biosynthesis, paclobutrazol (PBZ). The results demonstrated that GA3 increased total grapevine mass, with carbon allocated to the whole grapevine (as structural and soluble carbohydrates). Both GA3 and ABA
increased monosaccharide (glucose and fructose) levels in berries (up to tenfold) and roots (up to threefold). However, GA3 increased the net carbon fixation whereas ABA did not. PBZ diminished most growth parameters except grapevine mass, and allocated more carbohydrates to roots (up to threefold more sucrose and starch). Such results
indicate that GAs promote net carbon fixation and transport, whereas ABA as a stress signal only enhances sugar transport; notwithstanding the two hormones promoted
carbon allocation toward roots and berries.


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