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

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.

摘要：碧根果（美国山核桃，Carya illinoinensis Koch）为墨西哥北部与美国东南部的本土树种，上述两国的碧根果产量均位居全球前列。本研究旨在探明两个品种（Western与Wichita）的碧根果根系与树干在一个完整生产周期内的月度淀粉平衡情况。本研究采用系统抽样法开展采样工作。结果显示，两个品种的根系与茎干淀粉浓度存在显著差异：Wichita品种的淀粉浓度高于Western品种；且Wichita品种在两种器官中均具备更优异的淀粉积累条件。该品种更高的淀粉积累量，源于其生长发育对生物和非生物因子的需求相较于其他品种更低。