摘要
[目的]探究不同光照强度对入侵种大狼耙草与本地种山莴苣光合特性的影响,为揭示大狼耙草的入侵机制提供参考依据。[方法]以2种植物盆栽幼苗为材料,采用黑色遮阳网建立100%、40%、24%、14%光强的遮阴棚,比较植物处理间叶片光合特性差异。[结果] 1)100%和14%光强下,大狼耙草最大净光合速率(P_(max))、光饱和点(LSP)均明显高于山莴苣,光补偿点(LCP)则低于山莴苣。2)100%和14%光强下,大狼耙草的叶绿素质量分数明显高于山莴苣。3)大狼耙草的羧化效率(CE)、Rubisco最大羧化速率(V_(c,max))、RuBP最大再生速率(J_(max))及无CO_(2)时的光呼吸速率(R_(P))在100%光强下显著高于山莴苣,V_(c,max)在14%光强下明显高于山莴苣,而R_(p)在中低光强下下降并低于山莴苣。4)大狼耙草的P_(max)、R_(d)、CE、A_(max)、R_(p)、J_(max)比山莴苣具有更高可塑性。[结论]入侵植物大狼耙草在不同光强下表现出更高的光合能力和光合生理可塑性,对光强具有更广泛的适应范围。
[Objective]The study investigates the effects of different light intensities on the photosynthetic characteristics of the invasive species Bidens frondosa and the native species Lactuca indica,aiming to provide a reference for revealing the invasion mechanism of B.frondosa.[Methods]Potted seedlings of the two plant species were used as the materials.Shading shelters were established using black shade nets with light intensities of 100%,40%,24%,and 14%,and differences in leaf photosynthetic characteristics under varied treatments were compared.[Results]1)Under 100% and 14% light intensities,B.frondosa exhibited significantly higher maximum net photosynthetic rate(P_(max))and light saturation point(LSP),but lower light compensation point(LCP)than L.indica.2)Under 100% and 14%light intensities,the chlorophyll content of B.frondosa was significantly higher than that of L.indica.3)Under 100% light intensity,B.frondosa showed significantly higher carboxylation efficiency(CE),maximum carboxylation rate of Rubisco(V_(c,max)),maximum regeneration rate of RuBP(J_(max)),and photorespiration rate without CO_(2)(R_(p))than L.indica.V_(c,max) was also significantly higher under 14%light intensity,while Rp decreased under medium and low light intensities and was lower than L.indica.4)B.frondosa exhibited greater plasticity in P_(max),R_(d),CE,A_(max),R_(p),and J_(max) than L.indica.[Conclusion]The invasive plant B.frondosa shows higher photosynthetic capacity and greater photosynthetic physiological plasticity under different light intensities,indicating a broader adaptability to light intensities.
作者
廖炟
李滨玲
宋薇
周兵
苏启陶
闫小红
LIAO Da;LI Binling;SONG Wei;ZHOU Bing;SU Qitao;YAN Xiaohong(College of Life Science,Jinggangshan University,Ji′an,Jiangxi 343009,China;Key Laboratory of Jiangxi Province for Biological Invasion and Biosecurity,Ji′an,Jiangxi 343009,China)
出处
《水土保持学报》
北大核心
2025年第5期349-356,共8页
Journal of Soil and Water Conservation
基金
江西省自然科学基金项目(20212BAB205018)
国家自然科学基金项目(32360264)。
关键词
入侵种
大狼耙草
光照强度
光合特性
invasive species
Bidens frondosa
light intensity
photosynthetic characteristics
作者简介
第一作者:廖炟(2001-),女,硕士研究生,主要从事入侵植物生理生态研究。E-mail:1779044601@qq.com;通信作者:闫小红(1977-),女,副教授,主要从事入侵植物生理生态研究。E-mail:yanxiaohong 325@126.com。
