ABSTRACT

In organic production of potatoes for processing into starch, it is essential to obtain high and stable starch yields, as determined by the yield of tubers and the content of starch in the tubers. The stability of these traits in potato varieties is especially important in variable environments affected by soil properties and climatic conditions. Pre-sprouting of the seed tubers before planting can accelerate plant development and promote acceptable starch yields in a shorter growing period. This study evaluated traits of seven potato varieties important for organic starch production, assessed trait stability in different environments and determined the effect of seed tuber pre-sprouting on plant development and stability parameters. Significant effects of genotype, growing environment, and their interactions on tuber yield, starch yield and starch content of the tubers were observed. No significant effects were found of seed tuber pre-sprouting on the performance of the tested traits. Four trait stability evaluation methods were applied to tuber yield, starch yield and starch content, including a modified Kang’s yield-stability approach, and these showed inconsistent results. The modified Kang’s stability rating could be further used for determination of the best performing varieties, with high values for the essential traits and relatively high stability for each individual trait.

摘要

在用于加工成淀粉的马铃薯的有机生产中，获得高而稳定的淀粉产量是必不可少的，这取决于块茎的产量和块茎中的淀粉含量。马铃薯品种中这些性状的稳定性在受土壤特性和气候条件影响的多变环境中尤为重要。在种植前对块茎进行预发芽可以加速植物发育并在较短的生长期促进可接受的淀粉产量。本研究评估了 7 个对有机淀粉生产很重要的马铃薯品种的性状，评估了不同环境中的性状稳定性，并确定了块茎预发芽对植物发育和稳定性参数的影响。基因型、生长环境及其相互作用对块茎产量的显着影响，观察块茎的淀粉产量和淀粉含量。未发现块茎预发芽对测试性状的表现有显着影响。对块茎产量、淀粉产量和淀粉含量采用四种性状稳定性评价方法，包括改良的康氏产量-稳定性方法，结果不一致。修改后的康氏稳定性等级可进一步用于确定表现最佳的品种，其基本性状具有较高的价值，并且每个性状的稳定性都相对较高。包括改进的 Kang 的产量稳定性方法，这些方法显示出不一致的结果。修改后的康氏稳定性等级可进一步用于确定表现最佳的品种，其基本性状具有较高的价值，并且每个性状的稳定性都相对较高。包括改进的 Kang 的产量稳定性方法，这些方法显示出不一致的结果。修改后的康氏稳定性等级可进一步用于确定表现最佳的品种，其基本性状具有较高的价值，并且每个性状的稳定性都相对较高。