摘要
为探明淹水胁迫对乡土风箱果和引种紫叶风箱果叶片光合特性的影响,为风箱果属植物的推广种植提供技术支持,利用双套盆法研究了淹水胁迫对乡土风箱果和引种紫叶风箱果叶片光合气体交换参数和叶绿素荧光参数的影响。结果表明:淹水15 d时2种风箱果叶片的净光合速率(Pn)均显著降低,并且伴随着气孔导度(Gs)和蒸腾速率(Tr)的降低,即淹水胁迫导致的2种风箱果叶片光合能力降低均与气孔因素的限制有关;淹水胁迫下紫叶风箱果叶片的光合抑制主要为气孔因素,而乡土风箱果则为气孔和非气孔因素的共同限制;叶绿素荧光技术分析发现,淹水15 d时紫叶风箱果叶片PSⅡ反应中心活性没有受到明显的影响,主要与非光化学淬灭(NPQ)的增加降低了过剩光能(1-qP)/NPQ有关,而乡土风箱果在淹水胁迫下的PSⅡ反应中心光化学活性明显降低;淹水胁迫明显提高了紫叶风箱果叶片PSⅡ供体侧放氧复合体(OEC)的活性,而对其受体侧电子传递的影响较小;淹水胁迫显著抑制了风箱果叶片PSⅡ受体侧QA向QB的电子传递能力,但不能确定淹水胁迫对风箱果PSⅡ供体侧OEC活性的影响;淹水15 d时风箱果叶片标准化O-K曲线上L点的相对可变荧光VL明显高于紫叶风箱果,即淹水胁迫下风箱果叶片的类囊体膜降解程度明显大于紫叶风箱果;紫叶风箱果较风箱果具有较强的耐淹水能力,在城市低洼易积水地区应选择紫叶风箱果推广种植。
To provide technical support for the promotion and cultivation of Physocarpus plants,the double setting pot method was used to examine the effects of flooding stress on the photosynthetic characteristics of leaves,including photosynthetic gas exchange and chlorophyll fluorescence,in native species P. amurensis and introduced species P. opulifolius. The net photosynthetic rates（ Pn） of leaves of both species were significantly reduced after 15 days of flooding stress,along with decreased stomatal conductance（ Gs） and transpiration rates（ Tr）. Our findings indicated that the decreased photosynthetic capacity of leaves of both species caused by flooding stress was related to the restriction of stomatal factors. Under flooding stress,the photosynthetic inhibition of P. opulifolius was mainly caused by stomatal changes,while that of native P. amurensis was caused by both stomatal and non-stomatal factors. The activity of the PSII reaction center of P. opulifolius leaves was not significantly affected by flooding stress,which was mainly related to the increase of non-photochemical quenching（ NPQ） that reduced the excess light energy（ 1-qP）/NPQ. In contrast,the photochemical activity of the PSII reaction center of native species P. amurensis was significantly reduced by flooding stress. Flooding stress signifi-cantly increased the activity of the oxygen-evolving complex（ OEC） of the PSII donor side in P. opulifolius leaves and had little effects on the electron transfer of its acceptor side. Flooding stress significantly inhibited the electronic transfer ability of QAto QBin the PSII acceptor side of P. amurensis,but the effect of flooding stress on the activity of OEC in the PSII donor side of P. amurensis was not found. After 15 days of flooding,the relative variable fluorescence（ VL） at the L point was significantly higher than that of P. opulifolius in the standardized O-K curve of P. amurensis leaves,indicating that the degree of thylakoid membrane degradation of P. amurensis leaves unde
作者
许楠
龙静泓
张文石
闫鑫
张鹤
聂鑫
许婳婳
张会慧
XU Nan;LONG Jing-hong;ZHANG Wen-shi;YAN Xin;ZHANG He;NIE Xin;XU Hua-hua;ZHANG Hui-hui(Institute of Nature ＆ Ecology, Heilongjiang Academy of Sciences, Harbin 150040, China;College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China）.)
出处
《生态学杂志》
CAS
CSCD
北大核心
2018年第6期1880-1888,共9页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31500323)资助
关键词
风箱果
淹水
光合特性
叶绿素荧光特性
Physocarpus
flooding
photosynthesis capacity
chlorophyll fluorescence characteristics
