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作 者:郁凯 赵小慧 刘冲[1] 董静[1] 何苏南 王绪奎 郁洁 尚辉 张骁 邢锦城[1] YU Kai;ZHAO Xiaohui;LIU Chong;DONG Jing;HE Sunan;WANG Xukui;YU Jie;SHANG Hui;ZHANG Xiao;XING Jincheng(Institute of Agricultural Sciences in Jiangsu Coastal Areas,Yancheng 224002,China;Jiangsu Province Farmland Quality and Agricultural Environmental Protection Station,Nanjing 210036,China;Jiangsu Coast Development(Dongtai)Co.,Ltd,Yancheng 224200,China)
机构地区:[1]江苏沿海地区农业科学研究所,江苏盐城224002 [2]江苏省耕地质量与农业环境保护站,江苏南京210036 [3]江苏省沿海开发(东台)有限公司,江苏盐城224200
出 处:《中国草地学报》2025年第3期45-53,共9页Chinese Journal of Grassland
基 金:江苏省碳达峰碳中和科技创新专项资金项目(BE2022-304);2023年省级农业科技创新与推广补助专项(YHS2023026);盐城市重点研发计划(社会发展)指导性项目(YCBE202338);农业农村部沿海盐碱地科学观测实验站开放课题暨所基金项目(YHS202206)。
摘 要:本研究以盐地碱蓬为材料,探讨高盐胁迫(300 mmol/L NaCl)处理下外源添加0、12.5、25、50、100、200 mg/L(记为P0、P1、P2、P3、P4、P5)浓度的黄腐酸钾(PFA)对其种子萌发以及幼苗生长的调控,以期为提高高盐环境中盐地碱蓬的种子萌发和生长提供技术支撑,并为利用盐地碱蓬修复盐碱地提供参考。结果表明,300 mmol/L NaCl显著抑制盐地碱蓬种子萌发和幼苗正常生长,外源添加不同浓度PFA均可促进盐胁迫下盐地碱蓬种子的萌发和幼苗的生长。与P0处理相比,P2和P3处理种子的发芽势、发芽率、发芽指数和种子活力指数显著提高,幼苗的芽长、根长、鲜重显著增加;不同浓度外源PFA均显著提高了盐胁迫下盐地碱蓬的可溶性糖、脯氨酸含量和过氧化氢酶、过氧化物酶活性,显著降低了丙二醛和过氧化氢的含量,且随PFA浓度增加,可溶性糖和脯氨酸含量、过氧化氢酶和过氧化物酶活性均呈先升后降的趋势,丙二醛和过氧化氢含量呈先降后升的趋势。主成分分析表明,各浓度外源PFA综合作用排序为P3>P2>P4>P5>P1>P0,最佳浓度是50 mg/L。灰色关联度分析表明,与外源PFA浓度关联度排名前五的分别是可溶性糖含量、过氧化氢酶活性、根长、芽长和超氧化物歧化酶活性。综上,添加50 mg/L的PFA对盐地碱蓬萌发和幼苗生长的高盐抑制的缓解效果最好,主要原因是植物的抗氧化和渗透调节得以改善。This study investigated the effects of exogenous potassium fulvic acid(PFA)on seed germination,seedling growth,and physiological mechanisms of Suaeda salsa L.under salt stress(300 mmol/L NaCl).Seeds were treated with PFA at of 0(P0),12.5(P1),25(P2),50(P3),100(P4),and 200(P5)mg/L during the germination and seedling period.This research provides technical guidance for improving the germination and growth of the halophytes S.salsa in saline soils and offers a scientific basis for the remediation and utilization of saline-alkali land.The results showed that 300 mmol/L NaCl inhibited seed germination and normal seedling growth.However,PFA application mitigated these inhibitory effects.Specifically,P2 and P3 treatments significantly enhanced seed germination and seedling growth indices.Exogenous PFA significantly increased soluble sugar and proline content,as well as catalase and peroxidase activities,while significantly decreasing malondialdehyde and hydrogen peroxide content under salt stress.With increasing PFA concentrations,the soluble sugar and proline content,and catalase and peroxidase activities initially increased and subsequently decreased,whereas malondialdehyde and hydrogen peroxide content initially decreased and then increased.Principal component analysis revealed the following ranking of PFA treatment effectiveness in alleviating salt stress:P3>P2>P4>P5>P1>P0.The optimal PFA concentration was determined to be 50 mg/L.Grey correlation analysis identified soluble sugar content,catalase activity,root length,shoot length,and superoxide dismutase activity as the top five factors correlated with exogenous PFA concentrations.In conclusion,the addition of 50 mg/L PFA effectively alleviated salt stress inhibition of seed germination and seedling growth,primarily by enhancing antioxidant and osmotic regulation.
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