不同植物生长促进剂对稻茬麦幼苗生长及抗寒性的影响  

Effects of Different Plant Growth Promoters on the Growth and Cold Tolerance of Wheat Grown After Rice

作　　者：韩笑 薛亚光[1] 石吕 石晓旭 李赢 刘海翠 刘建[1] HAN Xiao;XUE Ya-guang;SHI Lyu;SHI Xiao-xu;LI Ying;LIU Hai-cui;LIU Jian(Jiangsu Yanjiang Area Institute of Agricultural Sciences,Nantong 226001,China)

机构地区：[1]江苏沿江地区农业科学研究所,江苏南通226001

出　　处：《大麦与谷类科学》2022年第5期14-20,共7页Barley and Cereal Sciences

基　　金：江苏省科技项目(BE2020388);江苏沿江地区农业科学研究所青年基金[YJ(2021)006];南通市循环农业重点实验室(CP12015003)。

摘　　要：为探讨植物生长促进剂对稻茬麦幼苗生长及其抗寒性的影响,以扬麦29为材料,研究不同浓度外源表油菜素内酯(24-EBR)、6-苄基氨基嘌呤(6-BA)和萘乙酸(NAA)对稻茬麦幼苗地上/地下部生长、抗寒性、抗氧化酶活性和丙二醛含量的影响。结果表明,与CK相比,在3叶期喷施0.01、0.10 mg/L 24-EBR,1、10 mg/L 6-BA和10 mg/L NAA,稻茬麦地上部干物质、根干质量和根平均直径均升高,冻害率和冻害指数均降低;叶片蛋白质含量和SOD活性均显著升高,最大升高幅度分别为1 mg/L 6-BA处理下的7.36%(蛋白质含量)和0.10 mg/L 24-EBR处理下的7.33%(SOD活性);叶片丙二醛含量显著降低,最大降低幅度为0.10 mg/L 24-EBR处理下的26.95%。喷施上述适宜浓度植物生长促进剂,有利于提高低温胁迫下稻茬麦的抗寒能力及幼苗素质。This study aimed to evaluate the effects of plant growth promoters(PGPs)on the growth and cold tolerance in wheat grown after rice,using the wheat variety Yangmai 29 as the experimental material.Three PGPs,namely 24-EBR,6-BA,and NAA,were sprayed onto leaves at different concentrations;their effects on wheat growth and cold tolerance were determined by measuring above-and under-ground dry weights,cold tolerance,antioxidant enzyme activity,and malondialdehyde content in wheat plants.The results showed that compared with the control(spraying water onto leaves),spraying 24-EBR at 0.01、0.10 mg/L,6-BA at 1、10 mg/L,and NAA at 10 mg/L onto wheat seedlings at three-leaf stage led to increases in the dry weights of above ground and roots,and the mean diameter of roots,but decreases in both freezing injury rate and freezing injury index.Moreover,the PGPs treatments significantly elevated leaf protein content and SOD activity compared with the control,and the two treatments 6-BA at 1 mg/L and 24-EBR at 0.10 mg/L had the maximum increases in leaf protein content and SOD activity by 7.36%and 7.33%,respectively.The malondialdehyde content in leaves significantly decreased with the PGPs,and the maximum reduction was 26.95%with 24-EBR at 0.10 mg/L.Thus,spray-application of the PGPs at appropriate concentrations is beneficial to improving the cold tolerance and seedling quality of wheat grown after rice under low temperature stress.

关 键 词：稻茬麦 植物生长促进剂 抗寒性 幼苗素质 

分 类 号：S512.1[农业科学—作物学]