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对三叶一心的缺钼冬小麦进行 2 4h低温处理 (- 5℃～ 0℃ )后 ,冬小麦幼苗出现缺钼症状 ,并迅速波及整个植株 ,下部叶片尤为严重。缺钼及低温对幼苗地上部、根干重无明显影响 ;但经低温处理的冬小麦幼苗叶片色素含量下降 ,以叶绿素a +b减少最为明显 ;缺钼植株上部叶片在低温处理到 2 4h时 ,K+ 渗漏速率出现最大值 ,下部叶片在 9h时即达到高峰。常温下 ,供钼能提高冬小麦功能叶 (倒二叶 )可溶性总糖、蔗糖含量 ,同时使倒三叶中可溶性总糖、蔗糖含量也保持在较高水平 ;低温条件下 ,供钼植株倒三叶、功能叶可溶性总糖、蔗糖含量明显降低 ,缺钼植株功能叶糖含量下降 ,但倒三叶含量上升
After 24 h of low temperature treatment (-5 ℃ ~ 0 ℃), the winter wheat seedlings appeared molybdenum deficiency symptoms, and quickly spread to the whole plant, the lower leaves were particularly serious. Molybdenum and low temperature had no obvious effect on the shoot and root dry weight of seedlings, but the content of chlorophyll a + b in the leaves of low-temperature-treated winter wheat decreased with the decrease of chlorophyll a + b. K + leakage rate appeared maximum, the lower leaves reached the peak at 9h. Under normal temperature, the supply of molybdenum could increase the total soluble sugar and sucrose content of functional leaves (inverted second leaves) of winter wheat and the content of total soluble sugar and sucrose in inverted clover at the same time. Under low temperature, The content of total soluble sugar and sucrose in leaves and functional leaves decreased obviously, while the content of functional sugar in functional plants reduced, but the content of inverted clover increased