CARBOHYDRATE BALANCE IN DIFFERENT PLANT COMPARTMENTS OF OAK (Quercus petraea) AND BEECH (Fagus sylvatica) SUBJECTED TO DEFOLIATION AND SHADE

Starch balance in perennial organs of Carya illinoinensis Koch in a production cycle

“…This may also indicate that stem growth takes place during the production stage, while root growth takes place in the dormancy stage, as reported by VALENZUELA-NÚÑEZ et al (2011) andVALENZUELA-NÚÑEZ et al (2014). This pattern of growth and reactivation of tissues in different phenological stages is a very common behavior in porous wood species (ZIMMERMANN & BROWN 1971) such as walnut tree (GONZÁLEZ-CERVANTES et al 2014). Walnut tree, like other fruit trees, presents alternation in the productive cycle due to the decrease in starch reserves in the formation and metabolism of the fruit, this affects the reserves to meet the demands of a new cycle of flowering and fruit development for next year (DAVIE Y STASSEN, 1997).…”

“…In the case of the stem; the differences between varieties showed that the Wichita variety, in the production stage (months from September to November, figure 2), presented a higher starch concentration, with respect to the dormancy stage (months from December to February, figure 2) , which could be the result of the carbon contribution assimilated by the mature leaves during the production stage, and which also makes evident the demand for starch due to the diametrical growth of the stem (LACHAUD; BONNEMAIN, 1981); this behavior was presented inversely with respect to the starch concentration in the root, since in the production stage it decreased, increasing in the dormancy stage. This may also indicate that stem growth takes place during the production stage, while root growth takes place in the dormancy stage, as reported by VALENZUELA-NÚÑEZ et al (2011) andVALENZUELA-NÚÑEZ et al (2014). This pattern of growth and reactivation of tissues in different phenological stages is a very common behavior in porous wood species (ZIMMERMANN & BROWN 1971) such as walnut tree (GONZÁLEZ-CERVANTES et al 2014).…”

Total Soluble Sugars in Root and Stem of Wichita and Western Carya Illinoinensis Varieties in Northern Mexico

“…The TSS in perennial deciduous trees is mobilised from the organ reservoirs to the specific demand sites to mainly provide energy during the winter and dormancy stage (Smith et al, 2018); to contribute to withstanding chilling temperatures; and also to contribute to dormancy breakage and promote bud growth during spring (Ok et al, 2021;Tixier et al, 2019). Total soluble sugars also participate in respiration and osmotic regulation (Briceño-Contreras et al, 2021;Hartann & Trombore, 2016), as well as in root (Valenzuela-Núñez et al, 2014), leaf and stem growth (Magel, Eining, & Hampp, 2000).…”