Abstract
Abstract Pecan tree (Carya illinoinensis Koch) is a native specie in Northern Mexico and the Southeastern United States, both countries dominate the production of walnuts to worldwide. The objective was to determine starch balance in root and trunk monthly in two varieties (Western and Wichita), during a production cycle. Sampling was systematic. Results in root and stem showed differences in starch concentrations between varieties, Wichita presented higher concentrations than Western. Wichita variety, in both organs, showed better accumulation conditions of starch. In response to higher starch accumulation in this variety its due to biotic and abiotic requirements to develop up are less demanding than other varieties.
Highlights
Materials and MethodsThe forest and fruit trees of perennial character are subject to changes that may present themselves in environmental conditions during their life cycle, which can occur between growing seasons over a year or as well in several years (VASCONCELOS-RIBEIRO et al, 2012)
A significant interaction was observed between the two factors and the starch concentration in the root (F = 49.977, g. l. = 11, 360; P ≤ 0.001) (Table 2).The results in the walnut stem showed significant differences between the Wichita and Western varieties
Regarding the phenological stage of dormancy, according to MARTÍNEZ-TRINIDAD et al (2013) and Valenzuela-NÚÑEZ et al (2011) during this stage, the roots and stems of deciduous trees reach the maximum value of reserve storage, being the root that presents the greatest accumulation, which coincides with the results reported by NAVARRO-CERRILLO; CALVO (2003); SANZ-PÉREZ et al (2004); VALENZUELA-NÚÑEZ et al (2011); GAMBOA-PORRAS; MARÍN-MÉNDEZ (2012) and KOZLOWSKI (1992) they refer that it is in the root where it accumulates the greatest amount of reserve carbohydrates in the period prior to vegetative growth
Summary
Materials and MethodsThe forest and fruit trees of perennial character are subject to changes that may present themselves in environmental conditions during their life cycle, which can occur between growing seasons over a year or as well in several years (VASCONCELOS-RIBEIRO et al, 2012).
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