不同生长时期葛根光合特性及其与淀粉积累的关系  被引量:5

Relationship between photosynthesis characteristics and starch accumulation of Pueraria lobata during different growth stages

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作  者:郭丽君 张静[1] 肖冬[1,2] 黄永禄 曾东强[1] 何龙飞[1,2] 王爱勤[1,2] GUO Li-jun;ZHANG Jing;XIAO Dong;HUANG Yong-lu;ZENG Dong-qiang;HE Long-fei;WANG Ai-qin(College of Agriculture,Guangxi University,Nanning 530004,China;Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage,Nanning 530004,China)

机构地区:[1]广西大学农学院,南宁530004 [2]广西高校作物栽培学与耕作学重点实验室,南宁530004

出  处:《南方农业学报》2018年第4期662-668,共7页Journal of Southern Agriculture

基  金:广西科学研究与技术开发计划项目(桂科重1298001-3-1);南宁市重点研发项目(20162094);广西新农村发展研究院能力建设示范项目(AE60200001)

摘  要:【目的】研究不同生长时期葛根光合特性与淀粉积累的相互关系,为葛根淀粉积累过程的调控及品质改良提供理论参考。【方法】以桂葛1号和桂葛8号为试验材料,在不同生长时期(6~12月)测定其叶片净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)和蒸腾速率(Tr)等光合参数及块根直链淀粉和支链淀粉含量,计算总淀粉含量,同时测定单株鲜重及干物质含量,分析各指标在不同生长时期的变化趋势及其相互关系。【结果】桂葛1号和桂葛8号叶片的Pn、Gs、Ci和Tr在6~12月呈单峰曲线变化,均在10月达峰值,之后迅速下降;各光合参数在整个生长时期总体上表现为桂葛8号高于桂葛1号。两葛根品种块根的直链淀粉、支链淀粉和总淀粉含量在6~12月均逐渐增加,其中6~10月快速积累,10月后略有升高或趋于稳定;各生长时期直链淀粉含量均表现为桂葛1号高于桂葛8号,支链淀粉含量则表现为桂葛8号高于桂葛1号;总淀粉含量与支链淀粉含量表现基本一致。整个生长时期桂葛8号的单株鲜重和干物质含量均高于桂葛1号,两指标变化趋势一致,均表现为6~10月缓慢增加,10月后快速增加。相关性分析结果表明,葛根叶片的Pn、Gs、Ci与支链淀粉含量呈极显著(P<0.01,下同)或显著(P<0.05,下同)正相关,与总淀粉含量呈显著正相关,与直链淀粉含量、单株鲜重、干物质含量呈正相关,但相关性未达显著水平(P>0.05);支链淀粉和总淀粉含量与直链淀粉含量、单株鲜重和干物质含量呈极显著正相关。【结论】葛根叶片的Pn、Gs、Ci与支链淀粉和总淀粉含量呈极显著或显著正相关,可作为葛根淀粉含量及产量预测的参考指标。【Objective】Relationship between photosynthesis characteristics and starch accumulation of Pueraria lobata during different growth stages was studied in order to provide some theoretical references for the regulation and quality improvement in starch accumulation of P.lobata.【Method】Guige 1 and Guige 8 were used as experimental materials.The photosynthetic parameters such as net photosynthetic rate(Pn),stomata conductance(Gs),intercellular CO2 concentration(Ci)and transpiration rate(Tr),as well as the contents of amylose and amylopectin in root tuber were determined.The total starch content was calculated.At the same time,fresh weight per plant and dry matter content were determined to analyze the variation trend of each index in different growth periods and their relationships between one and one another.【Result】The changes of Pn,Gs,Ci and Tr in leaves of Guige 1 and Guige 8 showed a unimodal curve from June to December,and they all reached the peak in October,then decreased rapidly.The photosynthetic parameters during the whole growth period of Guige 8 were larger than Guige 1 in general.The contents of amylose,amylopectin and total starch in root tuber of two P.lobata varieties increased gradually from June to December,accumulated rapidly from June to October,and increased slightly or tended to be stable after October.In various periods,amylose content of Guige 1 was higher than that of Guige 8,while amylopectin content of Guige 8 was higher than that of Guige 1.The changes of total starch content and amylopectin content were basically consistent.The fresh weight per plant and dry matter content of Guige 8 during the whole growing period were higher than those of Guige 1.The variation trend of the two indexes was consistent,which showed a slow increase from June to October and a rapid increase after October.The results of correlation analysis showed that there was extremely significant(P<0.01,the same below)or significant positive(P<0.05,the same below)correlation between Pn,Gs,Ci in leaves of P.lob

关 键 词:葛根 光合特性 淀粉含量 相关性 

分 类 号:S567.19[农业科学—中草药栽培]

 

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