杂种小麦光合特性的初步研究

对化杀型杂种小麦与普通小麦叶光合特性的比较研究表明，供试杂种小麦上部叶片倒３叶、旗叶一生中比普通小麦对照品种具有较高的叶绿素含量、净光合速率。ＲｕＢＰｃａｓｅ活性和ＲｕＢＰｏａｓｅ活性。杂种小麦叶片与对照相比在叶绿素含量缓解（ＲＳＰ）上优势较小，光合速率高值持续期（ＰＡＤ）和ＲｕＢＰｃａｓｅ含量则不具有优势。这表明，杂种小麦上部叶一生中光合速率的提高受到ＲｕＢＰｃａｓｅ含量的影响较小，而在很大程度

The Preliminary Study on the Leaf Photosynthetic Characteristics of Hybrid Wheat

The difference of photosynthetic characteristics between the wheat hybrids and cultivars was compared. The results showed that the third leaf from top and flag leaf of hybrids had higher value on chl, Pn, RuBPcase and RuBPoase activity. Compared with cultivars, the heterosis on relative steady phase of chlorophyll content(RSP)was little, and no heterosis was observed on leaf photosynthetic active duration(PAD)and RuBPcase content. The higher photo-synthetic rate of hybrid wheat may depond on the increase of the RuBPcase activity especially the RuBPcase initial activity and initial specific activity, and little influenced by the RuBPcase content. However, higher RuBPoase activity of hybrids indicated that hybrid wheat not only had higher photosynthetic carboxylatic effeciency, but also higher photorespiration consumption.