壳寡糖对干旱胁迫下油菜光合参数的影响  

Effects of Oligochitosan on Photosynthetic Parameter of Brassica napus Seedlings under Drought Stress

作　　者：李艳[1] 赵小明[2] 夏秀英[3] 栾雨时[3] 杜昱光[2] 李凤兰[1] 

机构地区：[1]北京林业大学生物科学与技术学院,北京100083 [2]中国科学院大连化学物理研究所,辽宁大连116023 [3]大连理工大学环境与生命学院,辽宁大连116024

出　　处：《作物学报》2008年第2期326-329,共4页Acta Agronomica Sinica

基　　金：中国科学院知识创新工程重要方向项目(KSCX2-YW-N-007);国家高技术研究发展计划(863计划)项目(2006AA10A213)

摘　　要：采用酶解法获得壳寡糖,利用CIRAS-2型便携式光合仪测定干旱胁迫下油菜光合参数。其叶片的净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)显著降低;气孔限制值(Ls)显著提高。说明气孔限制是油菜在干旱胁迫下Pn降低的主要原因。用50mgL-1壳寡糖溶液喷施油菜的幼苗叶片后发现干旱胁迫下油菜叶片的净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)显著提高;气孔限制值(Ls)显著降低。说明壳寡糖有助于减轻气孔限制引起的净光合速率的降低。壳寡糖还能促进幼苗根系生长。Effect of oligochitosan on enzyme activities associated with the resistance to epiphyte and bacteria diseases of plants has been reported. Oligochitosan was prepared in our labarotory. Brassica napus L. seedlings without or with oligochitosan treatment under drought stress were determined with PP-Systems company CIRAS-2 portable Photosynthetic apparatus in the trial. The result indicated that the net photosynthetic rate （Pn）, stomatal conductance （Gs）, intercellular CO2 concentration （Ci） decreased significantly （P 〈 0.05）, while stomatal limitation （Ls） increased significantly （P〈0.05） in Brassica napus L. seedlings under drought stress. The Pn, Gs, and Ci increased, while Ls decreased when Brassica napus seedlings treated with 50 mg L^-1 oligochitosan under drought stress. It indicated oligochitosan treatments are beneficial to reduce the drop of Pn caused by stomatal limitation in Brassica napus L. seedlings under drought stress. The dry weight of roots of rapes also increased by spraying oligochitosan under drought stress.

关 键 词：油菜 壳寡糖 净光合速率 气孔导度 胞间CO2浓度 气孔限制值 干重 

分 类 号：S565.4[农业科学—作物学]