摘要
为明确烯效唑(S-3307)和胺鲜酯(DA-6)对紫花苜蓿(Medicago sativa)内源激素及碳同化物含量动态变化的影响,为叶面施用S-3307、DA-6的适宜浓度和紫花苜蓿高产栽培方式提供一定的参考依据。试验以‘新牧4号’紫花苜蓿为试验材料,研究叶面喷施不同浓度的S-3307 (25、50、75、100 mg·L^(-1))、DA-6 (20、40、60、80 mg·L^(-1))对紫花苜蓿花荚脱落及叶片和小花内源激素、碳代谢的影响。结果表明:喷施S-3307、DA-6调控作用显著,随着喷施浓度的增加,可有效增加紫花苜蓿小花数、结荚数,降低其花荚脱落率;叶片及小花内源脱落酸(ABA)、玉米素核甘(ZR)和赤霉素(GA3)含量均表现出不同程度的增加;同时促进叶片及小花可溶性糖、淀粉的积累,与喷施清水对照相比,S-3307可提高叶片蔗糖含量,有利于改善源库关系。综上,叶面喷施适宜浓度的S-3307 (75 mg·L^(-1))、DA-6 (60 mg·L^(-1))可显著提高紫花苜蓿内源激素含量及碳同化物的代谢能力,降低紫花苜蓿花荚脱落率。
This study aimed to clarify the effects of S-3307 and DA-6 on dynamic changes of endogenous hormones and carbon assimilates in alfalfa(Medicago sativa),and to provide a specific reference basis for the appropriate concentration of foliar applications of S-3307 and DA-6 for the high-yield cultivation method of alfalfa.The experiment was conducted to study the effects of foliar application of different concentrations of S-3307(25,50,75 and 100 mg·L^(-1))and DA-6(20,40,60 and 80 mg·L^(-1))on the shedding of alfalfa pods,and the endogenous hormone concentrations and carbon metabolism of blades and florets,using alfalfa of‘Xinmu No.4’as the test material.We found that the spraying of S-3307 and DA-6 had a significant regulatory effect,which could effectively increase the number of alfalfa florets and pods and reduce their abscission rate as the spraying concentration increased.The content of endogenous abscisic acid,zeatin riboside,and gibberellin in the blades and florets showed contrasting degrees of increase.Spray applications also promoted the accumulation of soluble sugar and starch in blades and florets.Compared with the control,S-3307 increased the sucrose content of leaves,which was conducive to improving the source-store relationship.In conclusion,foliar spraying with appropriate concentrations of S-3307(75 mg·L^(-1))and DA-6(60 mg·L^(-1))significantly increased the content of endogenous hormones and the metabolism of carbon assimilates in alfalfa and reduced the abscission rate of flowers and pods.
作者
李浩天
隋晓青
杨静
王鑫尧
LI Haotian;SUI Xiaoqing;YANG Jing;WANG Xinyao(College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,Xinjiang,China)
出处
《草业科学》
CAS
CSCD
北大核心
2024年第2期437-447,共11页
Pratacultural Science
基金
国家自然科学基金项目(31960354)
农业生物育种重大项目“新疆地区耐盐碱抗旱高产苜蓿新品种设计与培育”(2022ZD0401104)。
