水分胁迫对花生不同器官非结构性碳水化合物含量的影响

为探讨不同生育时期水分胁迫对花生不同器官非结构性碳水化合物(NSC)“库—源—流”间的变化动态,以‘花育20号’和‘花育27号’花生品种为试材,采用控制条件下的防雨棚池栽方法,研究了花生生长发育过程中不同生育时期水分胁迫下,非结构性碳水化合物(NSC)在花生叶片、茎、根和荚果等器官中的动态变化。结果表明,全生育期干旱胁迫使花生叶片、茎和根中可溶性总糖含量和淀粉均明显升高,但荚果中可溶性糖含量却明显降低。无论何生育时期受到干旱胁迫均使得叶片中可溶性糖含量峰值提前15天左右出现,“源”物质输出提前但输出量降低,叶片提前衰老。生育前期干旱胁迫使滞留在荚果中的NSC含量增加,结荚期后干旱胁迫反而利于荚果中NSC的转化。全生育期水分适宜处理叶片中NSC含量相对较低且变化较小。由此表明,干旱胁迫降低了NSC由源至库的运输和转化,使荚果“库”容量降低。

Water Stress: Effects on Non-structural Carbohydrates Contents in Different Peanut Organs

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.