寡照复光试验中设施番茄叶片保护酶活性的变化

Changes in protective enzyme activity of protected tomato leaf in sparse sunlight and relighting experiments

番茄是山东地区的主要设施作物之一,研究光照对设施番茄的影响程度,对山东地区的设施农业生产有重要意义。以无限生长型番茄“粉冠”为试材,在花果期于日光温室内设置3、6、9、12和15 d共5个遮阴日数处理,以日光温室内自然光为对照,研究在不同遮阴日数下,番茄叶片的保护酶活性和复光后叶片保护酶的恢复能力。结果表明:寡照会使番茄叶片的保护酶活性升高,比叶重减小;随着遮阴日数的增加,番茄叶片的保护酶和比叶重的恢复能力逐渐降低,遮阴时间过长(12 d以上)则会对叶片光合系统产生不可逆的损伤,使保护酶活性无法恢复。

Tomato is one of the main facility crops in Shandong.It is important to study the effect of light on protected tomato for the production of protected agriculture in Shandong.The experiment takes the infinite-growth-type tomato“Power Corolla”as experimental material to study the protective enzyme activity of tomato leaf under different shading days and the recovery capability of protective enzyme under relighting.Five shading treatments of tomatoes are set in solar greenhouse during the flowering and fruiting period:T1(3-day shading),T2(6-day shading),T3(9-day shading),T4(12-day shading),and T5(15-day shading).Moreover,the growth of tomatoes under natural light in solar greenhouse is used as the control check.The results are as follows.Sparse sunlight would increase the protective enzyme activity of tomato leaf and reduce the specific leaf weight.As the number of shading days increases,the recovery capability of protective enzyme activity and specific leaf weight of tomato leaf would reduce.Long shading time(above 12 days)would cause irreversible damage to the photosynthetic system of leaf and make the protective enzyme activity unrecoverable.