摘要
采用不同浓度的NaCl溶液对4种一年生草本植物雾冰藜(Bassia dasyphylla)、白茎盐生草(Halogeton arachnoideus)、沙米(Agriophyllum squarrosum)和画眉草(Eragrostis pilosa)种子进行处理,通过测定种子相对发芽率、相对发芽势、发芽指数等指标,分析了种子萌发期耐盐差异性。结果表明:1)随着NaCl溶液浓度的增大,种子发芽率呈逐渐下降的趋势,在蒸馏水中第3天达到了发芽高峰,发芽基本结束,在NaCl溶液中第7天结束发芽。2)随NaCl溶液浓度逐渐增大,4种植物种子发芽率和发芽势均呈先增加后降低的趋势,同一植物种子发芽率和发芽势在不同浓度NaCl溶液中存在显著差异(P<0.05)。NaCl溶液浓度对白茎盐生草种子发芽率和发芽势影响较大,画眉草次之,其余两种较小。3)随NaCl溶液浓度逐渐增大,4种植物种子发芽指数呈下降趋势,雾冰藜活力指数显著高于白茎盐生草、沙米和画眉草种子;盐胁迫对画眉草发芽指数和活力指数影响较大,当NaCl溶液浓度达到2.1%时,幼苗活力指数降到最低。4)4种植物幼苗长度均随NaCl浓度增大表现出先增加后快速降低的趋势,0~0.3%NaCl浓度有促进幼苗生长的作用。0.6%及以上NaCl溶液浓度对画眉草幼苗长度产生了较大影响,而0.9%及以上NaCl溶液浓度对雾冰藜、白茎盐生草和沙米幼苗长度影响较大。综合各项指标分析表明,4种一年生植物种子萌发期耐盐性大小依次为沙米>雾冰藜>画眉草>白茎盐生草,根据发芽率、发芽势、幼苗长度等指标综合分析,最适宜萌发NaCl浓度分别为雾冰藜0~0.6%、白茎盐生草0~0.6%、沙米0~0.9%、画眉草0~0.6%。
The seeds of four annual herbaceous plants,Bassia dasyphylla,Halogeton arachnoideus,Agriophyllum squarrosum,and Eragrostis pilosa,were selected for treatment in a study of relative germination rate,relative germination potential,germination index,and other indicators to analyze their differing salt tolerance under different concentrations of NaCl solution.The following results were found:1)the germination rate of seeds gradually decreased with increasing NaCl concentration,and peak germination was achieved within 3 days in distilled water,while the germination was basically absent on day 7 in NaCl solution.2)When the concentration of NaCl solution increased gradually,the germination rate and germination potential of the four plant species first increased,then decreased.The germination rate and germination potential of the same plant's seeds varied significantly(P<0.05)in different concentrations of NaCl solution.Salt content had the greatest influence on the germination rate and germination energy of the H.arachnoideus seed,followed by E.pilosa,while the other two species exhibited the smallest change.3)Under the condition of increasing salt stress,the germination index of the four plant species showed a declining trend,with B.dasyphylla activity index being significantly higher than that of the H.arachnoideus,A.squarrosum,and E.pilosa;the salt stress had the greatest detrimental effect on the germination index and vigor index of E.pilosa.When the NaCl solution concentration reached 2.1%,the seedling vigor index was reduced to a minimum.4)The length of seedlings of the 4 plant species first increased with the increase of salt concentration and then decreased rapidly,thus a suitable concentration of salt promoted the growth of seedlings.Low concentration NaCl solution had a strong influence on the length of E.pilosa seedlings,while high concentration NaCl had a greater influence on the length of B.dasyphylla,H.arachnoideus,and A.squarrosum seedlings.According to the analysis of various indicators,the combined salt
作者
王景瑞
王立
徐先英
闫好原
胡生新
高承兵
魏林源
WANG Jingrui;WANG Li;XU Xianying;YAN Haoyuan;HU Shengxin;GAO Chengbing;WEI Linyuan(College of Forestry,Gansu Agricultural University,Lanzhou 730070,Gansu,China;Gansu Minqin Even Ancient City National Nature Reserve Administration,Minqin 733300,Gansu,China;Gansu Province Institute of Sand Control,Lanzhou 730070,Gansu,China)
出处
《草业科学》
CAS
CSCD
2020年第2期237-244,共8页
Pratacultural Science
基金
甘肃省科技重大专项计划“祁连山及其影响生态系统修复技术研究与示范”(18ZD2FA009)
重点研发计划“甘肃民勤连古城国家级自然保护区荒漠生态系统保护成效评价”(18YF1NA015)
甘肃省省青年科技基金“流动沙丘先锋植物沙米对风沙流胁迫的生理生化响应研究”(17JR5RA013)
甘肃省自然科学基金“不同地理种源沙葱的遗传多样性和种源筛选”(1606RJZA203)
关键词
一年生植物
耐盐性
相对发芽率
相对发芽势
发芽指数
活力指数
annual plants
salt tolerance
relative germination rate
relative germination potential
germination index
vigor index
