作物学报2018，Vol.44Issue(6)：909-919,11.DOI:10.3724/SP.J.1006.2018.00909
化控剂对东北春玉米茎秆理化特性及抗倒伏的影响
Effect of Chemical Regulators on Physical and Chemical Properties and Lodg-ing Resistance of Spring Maize Stem in Northeast China
摘要
Abstract
In order to investigate the mechanical mechanism of controlling lodging resistance of corn stalk, effects of chemical regulators on contents of cellulose, hemicellulose and lignin and lignin related enzyme activity of spring maize stalk were studied. Field experiments were conducted at the Xiangyang experimental practice base of Northeast Agricultural University in 2015 and 2016 using spring maize cultivar Dongnong 253 with two chemical regulators, DTB and KP (a chemical regulator made of DCPTA and ETH). Two chemical regulators were sprayed at the 6-leaf stage, with water spraying as the control. The randomized block group was designed with three replicates, and a plot area was 56 m2. The responses of bending resistance, lodging resistance index, lignin, cellulose and hemi-cellulose contents, and the activities of key enzymes of lignin synthesis at different growth stages of maize to different treatments were analyzed. The two chemical regulators application could significantly improve activities of 4-coumarate: CoA ligase (4CL) and cinnamyl alcohol dehydrogenase (CAD) in maize stem. The contents of cellulose, hemi-cellulose and lignin, bending resistance, and lodging resistance index were also improved significantly, where actual lodging rate decreased significantly. The lodging resistance index was extremely positively correlated with contents of lignin and hemi-cellulose (correlation coefficients were 0.67 and 0.64, respectively). The bending resistance was extremely positively correlated with the content of cellulose (correlation coefficient was 0.89). The content of lignin was extremely positively correlated with the activity of CAD (correlation coefficient was 0.89) and positively correlated with the activity of 4CL (correlation coefficient was 0.51). However, there's no significant correlation of lignin content with phenylalanine transaminase (PAL) and tyrosine ammonia lyase (TAL) activityies. Our results suggest that spraying chemical regulators at the 6-leaf stage can improve activities of key enzymes in stem (especially activities of CAD and 4CL), and stem fiber quality significantly enhancing stem lodging resistance of spring maize.关键词
春玉米/化控剂/理化特性/酶活性/抗倒伏性Key words
spring maize/chemical regulators/physio-biochemichal characteristics/enzyme activity/lodging resistance引用本文复制引用
樊海潮,顾万荣,杨德光,尉菊萍,朴琳,张倩,张立国,杨秀红,魏湜..化控剂对东北春玉米茎秆理化特性及抗倒伏的影响[J].作物学报,2018,44(6):909-919,11.基金项目
本研究由国家重点研发计划项目(2016YFD0300103,2017YFD0300506)和东北农业大学"学术骨干"基金项目(17XG23)资助. This study was supported by the National Key Research and Development Program of China (2016YFD0300103, 2017YFD0300506) and the "Academic Backbone" Project of Northeast Agricultural University (17XG23). （2016YFD0300103,2017YFD0300506）
