摘要
土壤碱化对植物幼苗的成功定植有明显抑制效应,探究碱性环境中种子的萌发及幼苗生长状况对于农业生产具有重要意义。本研究采用碱性盐碳酸钠(Na2CO3)模拟碱性环境,研究不同强度碱胁迫[0(CK,对照)、-0.1、-0.2、-0.3、-0.4和-0.6 MPa]对两种种皮颜色(黄色和黑褐色)紫花苜蓿种子(Medicago sativa)萌发和幼苗生长的影响。结果表明,对照条件下的黄色种子,其发芽率、发芽势、发芽指数、根系和种子活力指数分别比黑褐色种子高143.43%、151.33%、137.35%、38.69%和103.39%;在轻度碱胁迫(-0.2~-0.1 MPa)下黄色种子萌发能力增强,且对中度以上碱胁迫(<-0.3 MPa)的耐受力优于黑褐色种子;而轻度碱胁迫下,黑褐色种子的萌发和生长已受到明显抑制,且在重度碱胁迫(-0.6~-0.4 MPa)下无法存活。因此,实际生产中,挑选黄色种子比例更高的种子,更有利于土壤盐碱化区域紫花苜蓿草地的建植。
Soil alkalization has a significant inhibitory effect on the successful colonization of plant seedlings.Thus,exploring the germination of seeds and growth of seedlings in alkaline environments is of great significance for agricultural production.In this study,alkaline salt sodium carbonate(Na2CO3)was used to simulate an alkaline environment and evaluate the effects of different alkali stress intensities[0(CK),−0.1,−0.2,−0.3,−0.4,and−0.6 MPa]on two coat colors(yellow and dark brown)of alfalfa seeds(Medicago sativa)on germination and seedling growth.The results showed that under the control conditions,the germination rate,potential,and index,and root system and seed vigor index of yellow seeds were 143.43%,151.33%,137.35%,38.69%,and 103.39%higher than those of dark brown seeds,respectively.The germination ability of yellow seeds was enhanced under a low alkaline environment(−0.2 to−0.1 MPa),and the tolerance of yellow seeds to moderate alkali stress(<−0.3 MPa)was better than that of dark brown seeds.However,the germination and growth of dark brown seeds were significantly inhibited under low alkali conditions(−0.2 to−0.1 MPa)and they could not survive in high alkali environments.Therefore,in actual production,selecting seeds with a higher proportion of yellow seeds is more conducive to the establishment of alfalfa grassland in areas with soil salinization.
作者
韩嘉璇
高嵩
王俊锋
范燕闯
HAN Jiaxuan;GAO Song;WANG Junfeng;FAN Yanchuang(School of Landscape,Changchun University,Changchun 130022,Jilin,China;Key Laboratory of Vegetation Ecology,Ministry of Education/Jilin Songnen Grassland Ecosystem National Observation and Research Station/School of Life Sciences/Institute of Grassland Sciences,Northeast Normal University,Changchun 130024,Jilin,China)
出处
《草业科学》
CAS
CSCD
北大核心
2023年第3期724-731,共8页
Pratacultural Science
基金
吉林省自然科学基金项目(20200201201JC)
吉林省教育厅2023年度科学技术项目(JJKH20230687KJ)。
关键词
紫花苜蓿
种皮
胁迫
碱性盐
发芽
幼苗
耐碱性
Medicago sativa
seeds of different coat colors
stress
alkaline salt
germination
seedling
alkalic-resistance
