摘要
碳酸酐酶(carbonic anhydrase,CA)催化CO2的可逆水合反应,是参与CO2传导而进入羧化位点的重要光合酶,其活性高低对植物水分利用及光合作用有较大影响。为了研究干旱胁迫下番茄CA表达活性变化对植株光合作用及水分利用的影响,本文利用Northern杂交检测番茄叶片的胞质CA基因在干旱胁迫下的表达;测定干旱胁迫下番茄叶片CA活性、光合速率和叶片水势变化。结果表明,番茄叶片胞质CA基因受干旱胁迫诱导;CA活性随着干旱胁迫时间延长而发生由低至高再回落的变化,且变化规律基本与CA基因相似。番茄叶片的净光合速率和水势随着干旱程度和处理时间延长而降低。在75%的土壤相对水分含量条件下,植株的CA活性、光合速率及水势变化不明显。可见番茄叶水势和光合速率与CA表达活性之间存在一定的变化趋势相似性。
Carbonic anhydrase （CA） catalyzes the reversible hydration of CO2, and it is an important photosyn-thetic enzyme which take part in the CO2 conduction and get into the carboxylation site. The CA activity has a great effect on photosynthesis and water use efifciency. In order to study the effect of expression of CA gene on the plant photosynthesis and plant water potential in tomato （Lycopersicon esculentum）, the expression of cytoso-lic CA gene in tomato leaves under drought stress were determined by Northern blotting. And the CA enzyme ac-tivity, photosynthetic rate and water potential in tomato leaves under drought stress were also determined. The re-sults showed that the expression of cytosolic CA gene in tomato leaves was induced by drought stress. With the time of drought stress, the CA activity increased and then fell, and the changes were basically similar to that of CA gene expression. Net photosynthetic rate and water potential of tomato leaves decreased with the degree of drought and the treatment time. However, the CA activity, net photosynthetic rate and water potential changed slightly with the soil relative water content of 75%. The results indicated that there was a certain corresponding relationship be-tween the changes of water potential and photosynthetic rate in tomato leaves and the change of CA activity.
出处
《植物生理学报》
CAS
CSCD
北大核心
2015年第4期424-428,共5页
Plant Physiology Journal
基金
江苏省自然基金面上项目(BK20130503)
江苏省博士后基金项目(1102132C)
江苏高校优势学科建设工程资助项目
关键词
干旱胁迫
番茄叶片
碳酸酐酶活性
drought stress
tomato （Lycopersicon esculentum） leaves
CA activity
