水分胁迫对4种苗木叶绿素荧光的光化学淬灭和非光化学淬灭的影响  

Effects of Water Stress on Photochemical Quenching and Non-photochemical Quenching of Chlorophyll a Fluorescence in Four Tree Seedlings

作　　者：史胜青[1] 袁玉欣[1] 杨敏生[1] 梁海永[1] 张金香[2] 

机构地区：[1]河北农业大学林学院,保定071000 [2]河北省林业科学研究院,石家庄050013

出　　处：《林业科学》2004年第1期168-173,共6页Scientia Silvae Sinicae

基　　金：河北省自然科学基金 (3 0 114 5 );河北省林业局重点项目 (河北低山丘陵林果集节水技术研究 )资助

摘　　要：The changes of photochemical quenching(q P) and non-photochemical quenching(q N)of chlorophyll a fluorescence in leaves of four tree seedlings (Gleditsia sinensis,Juglans regia, Diospyros kaki and Diospyros lotus) were different between two different water stress ways:detached drought treatment and potted drought treatment. After 4 hours dehydration by leaf detaching,the q P values had significant decrease except J. regia, only 6 hours later, the q P values compared with contrast decreased significantly in four tree seedlings(P>0.05), but the range of reduction(G. sinensis, J. regia and D. lotus) was just 2.5% to 6.4%. D. kaki,however,got to 31.3%. While the q N values increased significantly with conducting dehydration of the detached leaves. However, the q P values of four species showed no significant decrease when they were growing in pots under soil water stress(40%～60%RWC) for 30 days; and the q N values decreased obviously with a exception in J. regia, which was consistent with that of detached leaf treatment. The results suggested that some difference or changes in mechanism of excess light energy dissipation might perform in four seedlings by short-term and long-term water stress.The changes of photochemical quenching(q P) and non-photochemical quenching(q N)of chlorophyll a fluorescence in leaves of four tree seedlings (Gleditsia sinensis,Juglans regia, Diospyros kaki and Diospyros lotus) were different between two different water stress ways:detached drought treatment and potted drought treatment. After 4 hours dehydration by leaf detaching,the q P values had significant decrease except J. regia, only 6 hours later, the q P values compared with contrast decreased significantly in four tree seedlings(P>0.05), but the range of reduction(G. sinensis, J. regia and D. lotus) was just 2.5% to 6.4%. D. kaki,however,got to 31.3%. While the q N values increased significantly with conducting dehydration of the detached leaves. However, the q P values of four species showed no significant decrease when they were growing in pots under soil water stress(40%～60%RWC) for 30 days; and the q N values decreased obviously with a exception in J. regia, which was consistent with that of detached leaf treatment. The results suggested that some difference or changes in mechanism of excess light energy dissipation might perform in four seedlings by short-term and long-term water stress.

关 键 词：水分胁迫 苗木 叶绿素荧光 光化学淬灭 非光化学淬灭 

分 类 号：S718.43[农业科学—林学]