马占相思幼苗不同器官非结构性碳水化合物含量对磷添加的响应  

Response of non-structural carbohydrate content in different organs of Acacia mangium seedlings to phosphorus addition

作　　者：吴妙兰 官滢滢 王艺颖 刘悦 何至杭 张少纯 曾睿楷 莫其锋 WU Miaolan;GUAN Yingying;WANG Yiying;LIU Yue;HE Zhihang;ZHANG Shaochun;ZENG Ruikai;MO Qifeng(Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm,College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,China;Guangdong E’huangzhang Field Observation and Research Station,Chinese Forest Ecosystem Research Nerwork,Yangjiang 529631,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东省森林植物种质创新与利用重点实验室,广州510642 [2]中国森林生态系统定位观测研究网络广东鹅凰嶂野外科学观测研究站,阳江529631

出　　处：《应用与环境生物学报》2024年第2期247-253,共7页Chinese Journal of Applied and Environmental Biology

基　　金：广东省林业科技创新项目(2022KJCX017,2022KJCX015);广东省基础与应用基础研究基金项目(2023A1515012129,2019A1515011508)资助。

摘　　要：非结构性碳水化合物(NSC)在植物抵御生物和非生物胁迫时发挥着不可或缺的作用.以马占相思作为研究对象,设置对照(CK,不加磷)、低磷(LP,+50 kg hm^(-2)a^(-1))、高磷(HP,+100 kg hm^(-2)a^(-1))3种处理,探究不同浓度磷添加对马占相思幼苗各器官的NSC含量及分配格局的影响.结果表明:(1)低磷(LP)处理显著增加马占相思幼苗苗高和地径的相对生长速率(RGR);苗高、地径的RGR在不同处理下均表现为LP>HP>CK.低磷和高磷均显著增加植株的总生物量;但是低磷显著提高了叶、枝、茎和粗根的生物量占全株生物量的比例,高磷仅改变了粗根的生物量占比.(2)磷添加显著增加叶绿素a、叶绿素b和总叶绿素浓度,具体表现为HP>LP>CK,(3)与CK相比,LP和HP处理下枝的NSC含量显著降低;粗根的NSC含量在LP处理下显著低于CK和HP处理.磷添加显著增加粗根可溶性糖占整株的百分比,同时磷添加显著增加枝、茎和粗根淀粉与NSC占整株含量的百分比.本研究表明低磷添加显著促进马占相思幼苗的生长,并通过调整NSC在不同器官的分配比例来应对土壤磷供应水平,以更好地适应土壤低磷环境.(图4表3参46)Non-structural carbohydrates(NSCs)play an important role in plant resistance to biotic and abiotic stresses.At present,information regarding the impact of phosphorous addition on NSC content and distribution patterns in different organs of Acacia mangium lacks.This study focused on A.mangium as the subject of investigation.Three treatments,including CK(no fertilization),low P addition(LP,+50 kg hm^(-2)a^(-1)),and high P addition(HP,+100 kg hm^(-2)a^(-1)),were set up to explore the response of NSC content and the distribution pattern in A.mangium to P addition.The results showed that(1)compared with the control(CK),LP treatment significantly increased the relative growth rate(RGR)of height and ground diameter of A.mangium seedlings.The RGR of seedling height and ground diameter under the different treatments were in the order of LP>HP>CK.Both the LP and HP treatments significantly increased the total biomass,and the LP treatment significantly increased the proportion of the biomass of leaves,branches,stems,and coarse roots in all the plants.However,the HP treatment changed the percentage of biomass in coarse roots.(2)P addition significantly increased the concentrations of chlorophyll a,chlorophyll b,and total chlorophyll in the following order:HP>LP>CK.(3)Compared with that of the CK treatment,the negative effects of LP and HP treatments on the NSC content in the branches were more significant.The NSC content of the coarse roots showed a significant negative response to the LP treatment,compared with CK and HP treatments.The addition of P significantly increased the proportion of thick roots in the whole plant of A.mangium and significantly increased the proportion of starch and NSC in the branches,stems,and coarse roots.In conclusion,our results showed that low P addition significantly increased the growth of A.mangium seedlings.Moreover,A.mangium can adjust the distribution of NSC in different organs to respond to the varying levels of P addition,thereby facilitating better adaptation to low phosphorus conditio

关 键 词：非结构性碳 磷添加 分配格局 马占相思 人工林 华南 

分 类 号：S51[农业科学—作物学]