Abstract:

The aim is to explore the dynamic changes of “sink source flow” of non-structural carbohydrate (NSC) in different organs of peanut at different growth stages under water stress. Two peanut varieties ‘HY 20’ and ‘HY 27’ were used as materials. Pool planting in rainfall shelter was conducted under controlled conditions. The dynamic changes of non-structure carbohydrate (NSC) in leaf, stem, root and pod of peanut were analyzed at different growth stages under water stress. The results showed that the contents of soluble sugar and starch in leaf, stem and root were increased, while the contents in pod were significantly decreased under drought stress during the whole growth period. The peak value of soluble sugar content in leaves appeared about 15d earlier under drought stress at any growth stage. The “source” substances were exported in advance, while the output decreased, which made the leaves senescent in advance. The contents of NSC in pod were increased under drought stress at the early growth stage, whereas drought stress after the pod-setting stage was beneficial to the transformation of NSC in pod. The content of NSC in leaves was relatively low and the change was small under normal growth condition. In general, the transport and transformation of NSC from source to sink are reduced under drought stress, and the “sink” capacity of pods is reduced.

Key words: peanut, water stress, non-structure carbohydrate, soluble sugar, starch