摘要
D ,L 甘油醛 (磷酸核酮糖激酶抑制剂 ,1 0mmol/L)处理小麦旗叶 1h可降低叶片净光合速率和表观量子效率。同时 ,光系统Ⅱ光化学效率(ΔF/Fm′)、电子传递速率 (ETR)和单位叶面积ATP含量均降低 ,而胞间二氧化碳浓度 (Ci)和叶绿素荧光非光化学猝灭 (NPQ)增加。这些结果说明 ,D ,L
Application of D,L glyceraldehyde (DLGA, 10 mmol/L), an inhibitor of phosphoribulokinase, decreased both net photosynthetic rate and apparent quantum yield of CO 2 assimilation (Φ c) by about 20%-30% in winter wheat flag leaves. It also decreased the photochemical efficiency (ΔF/Fm′) of PS II under actinic light, electron transport rate (ETR) and ATP content per unit leaf area but increased the intercellular CO 2 concentration and non photochemical quenching of chlorophyll fluorescence (NPQ). These results indicate that after DLGA treatment the decline in apparent quantum yield in wheat flag leaves is due to the feedback inhibition of photosynthetic electron transport caused by restriction of carbon assimilation.
基金
ThisworkwassupportedbytheNationalNaturalScienceFoundationofChina (No .3 973 0 0 40 )andtheStateKeyBasicResearchandDe velopmentPlan (No .G19980 10 10 0 ) .
