诺丽不同遮荫条件光响应模型筛选及其光合特性比较  

Screening of Light Response Models and Comparison of Photosyn-thetic Properties of Noni under Different Shading Conditions

作　　者：王昌跃 赵雅琦 向宇慧 姚继涛 谭梦怡 王鸿浩 祖超[1] 李志刚[1] 杨建峰[1] 王灿[1] WANG Changyue;ZHAO Yaqi;XIANG Yuhui;YAO Jitao;TAN Mengyi;WANG Honghao;ZU Chao;LI Zhigang;YANG Jianfeng;WANG Can(Spice and Beverage Research Institute,Chinese Academy of Tropical Agricultural Sciences/Key Laboratory of Genetic Re-sources Utilization of Spice and Beverage Crops,Ministry of Agriculture and Rural Affairs/Hainan Provincial Key Laboratory of Genetic Improvement and Quality Regulation for Tropical Spice and Beverage Crops/Wanning Agricultural Resources and Envi-ronment Hainan Field Scientific Observation and Research Station,Wanning,Hainan 571533,China;College of Tropical Crops,Yunnan Agricultural University,Pu’er,Yunnan 665099,China;Yangtz Normal University,Chongqing 408100,China;College of Agriculture,Heilongjiang Bayi Agricultural University,Daqing,Heilongjiang 163319,China)

机构地区：[1]中国热带农业科学院香料饮料研究所/农业农村部香辛饮料作物遗传资源利用重点实验室/海南省热带香辛饮料作物遗传改良与品质调控重点实验室/万宁农业资源环境海南省野外科学观测研究站,海南万宁571533 [2]云南农业大学热带作物学院,云南普洱665099 [3]长江师范学院,重庆408100 [4]黑龙江八一农垦大学农学院,黑龙江大庆163319

出　　处：《热带作物学报》2024年第12期2581-2591,共11页Chinese Journal of Tropical Crops

基　　金：国家重点研发计划项目(No.2023YFD1901403);万宁市重点科研项目(No.nlbzhzz2021);重点原料植物海南联合育种合作项目(No.Am20230493BC)。

摘　　要：光合作用是植物生长和发育的重要过程,而光响应曲线可以描述植物在不同光照条件下的光合速率与光照强度之间的关系。诺丽作为一种热作植物,明确其光合特性对于了解其生长和发育过程至关重要,而目前关于诺丽光合方面的报道相对较少。为了深入研究诺丽的光合特性及其环境适应性,本研究以4种(CK、T_(1)、T_(2)、T_(3))处理的诺丽为研究对象,采用LI-6400便携式光合仪测定光强日变化、净光合日变化、光响应曲线,并采用4种常用光响应模型进行拟合,筛选最佳模型后得出相应光合特征参数。结果表明:光强日变化呈现单峰抛物线变化趋势,在中午12:00时日光强达到最大,而诺丽的净光合日变化则呈现倒“U”型变化,在6:00—10:00时快速上升,10:00—16:00这一阶段缓慢下降,到16:00时快速下降,二者日变化存在一定同步性和非同步性变化;不同处理之间,净光合速率(P_(n))和光强(I)均随着遮荫度的增加出现明显的下降趋势;直角双曲线修正模型(MRHM)对诺丽光响应曲线拟合效果最好,除90%遮荫度外,其均方根误差(RMSE)、平均绝对误差(MAE)较其他3个模型最小,分别为0.06~0.12和0.05~0.09;随着遮荫度增加,诺丽的光合表观量子效率(AQE)、最大净光合速率(P_(nmax))、光饱和点(LSP)和暗呼吸速率(R_(d))逐步下降,而光补偿点(LCP)逐步增加,表明在弱光诱导下,诺丽光合效率逐步下降,过度遮荫时甚至大幅下降,其高光效特性须在强光刺激下才能激活。本研究揭示了诺丽光合特性及其对不同荫蔽度的应对策略,为深入了解诺丽生态适应性提供理论依据,也为生产上诺丽开展林下种植或遮荫措施提供参考。Photosynthesis plays a crucial role in the growth and development of plants,and the light response curve can describe the relationship between photosynthetic rate and light intensity under different light conditions.As a thermocrop plant,clarifying the photosynthetic characteristics of Noni is crucial for understanding its growth and development process,while there are relatively few reports on the photosynthetic aspects of Noni.In order to study the photosynthesis of Noni and its environmental adaptation,this study took Noni with four shade treatments(CK,T_(1),T_(2),T_(3))as the research object,and measured the daily change of light intensity,daily change of net photosynthesis and light response curve by LI-6400 portable photosynthesizer,and used four commonly used light response models to fit,and then screened the optimal model to obtain the corresponding photosynthetic characteristic parameters.The daily change of light intensity showed a single-peak parabolic trend,and the daily light intensity reached the maximum at 12∶00 noon,while the daily change of net photosynthesis of Noni showed an inverted U-shaped change,with a rapid increase from 6∶00 to 10∶00,and a slow decline from 10∶00 to 16∶00,and a rapid decline at 16∶00.The daily changes of the two existed some synchronous and non-synchronous changes.The net photosynthetic rate(P_(n))and light intensity(I)both showed obvious decreasing trends with the increase of shade between different treatments.The modified model of the right-angle hyperbola(MRHM)fit most effectively for the light response curve of Noni.With the exception of 90%shade,both the root mean square error(RMSE)and mean absolute error(MAE)were lower than those of the other three models,ranging from 0.06 to 0.12 and 0.05 to 0.09,respectively.With the increase of shade,the photosynthetic apparent quantum efficiency(AQE),maximum net photosynthetic rate(P_(nmax)),light saturation point(LSP)and dark respiration rate(Rd)of Noni gradually decreased,while the light compensation point(LCP)grad

关 键 词：诺丽 光响应曲线 光响应模型 光合特性 高光效 

分 类 号：S184[农业科学—农业基础科学]