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当前位置: 首页 > 文章 > 不同土壤水分含量对黄冠梨叶片光合效率和抗氧化特性的影响 北方园艺 2013 (10) 7-11
Position: Home > Articles > 不同土壤水分含量对黄冠梨叶片光合效率和抗氧化特性的影响 Northern Horticulture 2013 (10) 7-11

不同土壤水分含量对黄冠梨叶片光合效率和抗氧化特性的影响

作  者：
张晓峰;韩翔;张建光
单  位：
河北省梨工程技术研究中心
关键词：
梨;油菜素内酯(BR);净光合速率;抗氧化;水分胁迫
摘  要：
以2a生黄冠梨盆栽苗为试材,研究了不同土壤水分含量(75%、65%、55%、40%)及喷施油菜素内酯(BR)对叶片光合效能和抗氧化特性的影响.结果表明:当土壤含水量维持在75%左右时,叶片的光合效率最高,比65%、55%和40%土壤湿度分别提高了22.0%、78.5%和70.9%.当土壤含水量维持在75%左右时,超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)活性均较低,随着土壤含水量降低,抗氧化酶活性增强,土壤含水量维持在55%时,活性达到最高,但当土壤含水量降低到40%时,活性又显著降低;在土壤水分处于胁迫或非胁迫条件下,喷施油菜素内酯均可提高叶片SOD和APX活性,4种土壤水分处理SOD活性提高39.1%~113.3%,APX活性提高28.8%~141.7%,而且,在发生土壤水分胁迫时(55%和40%),喷施油菜素内酯显著地增加了叶片坏血酸(AsA)的含量;此外,喷施油菜素内酯还能改变叶片净光合速率日动态变化模式.
单  位：
College of Horticulture,Agricultural University of Hebei,Pear Engineering and Technology Research Center of Hebei Province,Baoding,Hebei 071000
关键词：
pear%brassinosteroid(BR)%net photosynthetic rate%antioxidant%drought stress
摘  要：
With two years old potted 'Huangguan' pear trees as material,the effect of different soil moisture contents and spraying brassinosteroid(BR) on leaf Pn and antioxidant ability in leaves were investigated in 'Huangguan' pears.The results showed that,when the soil moisture content maintained about 75% or so,the maimum leaf Pn was observed,being 22.0%,78.5% and 70.9% higher than 65%,55% and 40% soil moisture treatments,respectively.As soil moisture contents decreased,the net photosynthetic rates reduced but when the content reached 55% or below,the leaf Pn remained a lower level without significant changes.Moreover,when soil moisture content maintained 75% or so,a lower level of SOD and APX activiy was found but as soil moisture contents decreased,the activity of both enzymes increased and when the soil moisture content reached 55%,the activity achieved the maximum.However,when the soil moisture content decreased to 40%,the activity reduced significantly.Under stressed or unstressed soil moisture conditions,spraying BR could significantly increase leaf SOD and APX activities,with SOD activity from four soil moisture treatments increasing by 39.1%~113.3% and APX by 28.8%~141.7%.Furthermore,when the soil moisture stress(55% and 40%) occurred,the AsA contents in leaves rised.In addition,applying BR could change the diurnal leaf Pn pattern.

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