| 摘要: |
| 为研究冠菌素（COR）调控玉米节间伸长生长增产的相关机理，在大田条件下，以‘先玉335’和‘郑单958’玉米品种为材料，拔节期叶面喷施不同浓度（0、0.01、0.10、1.00和10.00 μmol/L）冠菌素（COR），系统分析对玉米基部节间形态性状、结构物质、抗折断力和根部的性状的影响。结果表明，COR显著提高玉米基部节间的直径、单位节间长度干重、抗折断力、半纤维素含量、纤维素含量和木质素含量，显著降低基部节间长度和节间干重，且随着COR浓度的增加，效应越明显。此外，COR还可促进玉米根系生长，随着COR浓度的增加，玉米植株气生根层数、入土气生根条数、气生根直径、气生根角度、根体积和根干重显著增加。综上所述，‘先玉335’和‘郑单958’对COR的敏感性不同，‘先玉335’抗倒伏的最适浓度为10.00 μmol/L，郑单958抗倒伏的最适浓度为1.00 μmol/L。 |
| 关键词: 冠菌素 玉米 节间性状 根部特性 |
| DOI：10.11841/j.issn.1007-4333.2019.03.01 |
| 投稿时间：2018-03-11 |
| 基金项目:国家重点研发计划（粮丰）项目（2016yfd0300102-4） |
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| Study of coronatine in regulating the basal internode and root characteristics of maize |
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TAO Qun, LIU Yingru, GUO Yuling, ZHOU Yuyi, TAN Weiming, ZHANG Mingcai, DUAN Liusheng
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| (College of Agronomy and Biotechnology/Engineering Research Center of Plant Growth Regulator of Ministry of Education, China Agricultural University, Beijing 100193, China) |
| Abstract: |
| In order to study the mechanism of coronatine (COR) regulating internode elongation and yield increased in maize,a field experiment using maize varieties ‘Xianyu 335’ and ‘Zhengdan 958’ as study objects was conducted to analysis the effects of spraying COR with different concentrations (0,0.01,0.10,1.00 and 10.00 μmol/L) at elongation stage on the morphological,structural substance,breaking resistance,and root traits of maize basal internode.The results showed that COR significantly increased the diameter,dry weight per unit internode length,breaking resistance,hemicellulose concentration,cellulose concentration,and lignin concentration,but remarkably decreased the length and dry weight of basal internode.The influencing effect was increased with the increasing of COR concentration.In addition,COR promoted the growth of the maize roots,and significantly increased the number of brace root plies,number of brace root,number of brace root,diameter of brace root,brace root angle,volume of root,and dry weight of root with the increasing of COR concentration.In summary,the optimal COR concentration for ‘Xianyu 335’ for lodging resistance was 10.00 and 1.00 μmol/L for ‘Zhengdan 958’,indicating that different maize varieties had different sensitivity level to COR. |
| Key words: coronatine maize internode characteristics root characteristics |
