摘要
以6个饲用甜高粱品种为材料,在NaCl和Na2SO4溶液的5个梯度比例(0(ck)、50、100、150、200 mmol/L)下进行种子萌发试验,通过测定发芽率、发芽势、芽长、根长、盐害率、株高、茎粗、干鲜比和可溶性糖含量等指标,探讨不同盐胁迫对种子萌发特性和幼苗生长的影响.结果表明,随着NaCl和Na2SO4浓度的增加,饲用甜高粱种子的发芽率、发芽势、芽长、根长和苗期的株高、茎粗、干鲜比均逐渐降低,盐害率和可溶性糖含量逐渐增大.NaCl浓度大于100 mmol/L和Na2SO4大于50 mmol/L时种子的发芽率、发芽势、株高、茎粗和干鲜比显著下降(p＜0.05).NaCl浓度为200 mmol/L时,大卡、海牛和中科甜2号停止生长,而Na2SO4浓度大于150 mmol/L时,大卡、海牛、中科甜438号和中科甜2号停止生长,说明Na2SO4胁迫的危害作用较为突出.隶属函数法综合评价显示,6个品种种子的萌发期和苗期耐盐性依次为:大卡＞3701＞中科甜438号＞中科甜2号＞海牛＞大力士和3701＞大力士＞大卡＞海牛＞中科甜438号＞中科甜2号.综上,饲用甜高粱3701的耐盐性较强、适合盐碱地区种植.
Abstract
Six forage Sorghum dochna varieties were used as materials for seed germination tests under 5 gradient ratios of NaCl and Na2SO4 solution(0(ck),50,100,150,200 mmol/L).Germination rate,germination potential,bud length,root length,salt damage rate,plant height,stem diameter,dry/fresh ratio and soluble sugar content were determined.To explore the effects of different salt stress on seed germination characteristics and seedling growth.The results showed that with the in-crease of NaCl and Na2SO4 concentrations,the germination rate,germination potential,bud length,root length,plant height,stem diameter and dry-fresh ratio of forage sweet sorghum seeds gradually decreased,and the salt damage rate and soluble sugar content gradually increased.When NaCl concen-tration was greater than 100 mmol/L and Na2SO4 was greater than 50 mmol/L,the germination rate,germination potential,plant height,stem diameter and dry-fresh ratio of seeds significantly decreased(p＜0.05).When the concentration of NaCl was 200 mmol/L,Dakar,Manatee and Zhongketian2 stopped growing,while when the concentration of Na2SO4 was greater than 150 mmol/L,Dakar,Manatee,Zhongketian438 and Zhongketian2 stopped growing,indicating that the harmful effect of Na2SO4 stress was more prominent.According to the comprehensive evaluation by membership func-tion method,the salt tolerance of the six varieties at germination and seedling stage was as follows:Dakar＞3701＞Zhongketian438＞Zhongketian2＞Manatee＞Dahlix and 3701＞Dahlix＞Dakar＞Mana-tee＞Zhongketian438＞Zhongketian2.In conclusion,the forage Sorghum dochna 3701 had strong salt tolerance and was suitable for planting in saline-alkali areas.
基金项目
新疆维吾尔自治区重点开发计划(2022B02042-2)
国家科技期刊平台
NSTL
万方数据