西南林业大学学报2017，Vol.37Issue(5)：48-54,7.DOI:10.11929/j.issn.2095-1914.2017.05.008
叶面施氮与剪枝对银中杨叶片形态及光化学的影响
Effects of Foliar Nitrogen Treatment and Pruning on Leaf Morphology and Photochemical Efficiency of Populus alba × Populus berolinensis
摘要
Abstract
Cutting seedlings of a hybrid poplar ( Populus alba × Populus berolinensis ) were pruned firstly as (CKJ), then leaf-sprayed by nitrate (NaNO3) or a mixed nitrate/nitrite (NaNO3/NaNO2) with a concentration of 30 mmol/L for a simulation experiment of nitrogen deposition. The effects of leaf-spraying and pruning on leaf mor-phology and photochemical efficiency of the seedlings were investigated. Results showed that pruning had no signifi-cant impacts on leaf photochemical efficiency ( Fv′/Fm′andΦPSII) , pigment content, relative electric conductivi-ty, and malondialdehyde ( MDA) content. Leaf spraying led to blade edge carbonization, rolling symptom at the edge of immature and mature leaves of the pruned seedlings, changes of chemical element contents on leaf surface, and a decline in leaf chlorophyll content. Moreover, leaf spraying led to an increase in leaf anthocyanin content of unpruned seedlings (TZ-NO3 and TZ-NO2) on the 6th and 12th day. On the 8th day of leaf spraying, values of Fv′/Fm′and ΦPSII of the unpruned seedlings were decreased as compared with the control ( CKZ ) , whereas the values of pruned seedlings were increased; on the 14th day, leaf photochemical efficiency of the pruned seedlings were in-creased significantly ( P<0. 05) . In addition, leaf spraying for 14 days led to a decline of MDA content of the un-pruned seedlings as compared with CKZ. In summary, the morphological and physiological characteristics were in-fluenced not by pruning but significantly by foliar NO3- treatment.关键词
银中杨/硝酸盐/剪枝/化学元素/光化学效率Key words
Populus alba × Populus berolinensis/nitrate/shoot pruning/chemical element/photochemical efficiency分类
农业科技引用本文复制引用
王亚,郭寒阳,胡彦波,张秀丽,孙广玉..叶面施氮与剪枝对银中杨叶片形态及光化学的影响[J].西南林业大学学报,2017,37(5):48-54,7.基金项目
国家自然科学基金( 31300506 （）
C160704 ) 资助 （）
东北林业大学生命科学学院大学生创新训练计划项目资助 （）
中央高校基本科研业务费专项资金项目 (2572017CA21) 资助. （2572017CA21）
