引用本文:钟爱文.埃格草(Egeria densa)对铵氮胁迫的生长和生理响应[J].环境科学研究,2018,31(1):117-122.
ZHONG Aiwen.Ammonium Nitrogen Stress on the Growth and Physiological Responses of Egeria densa[J].Reserrch of Environmental Science,2018,31(1):117-122.]
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埃格草(Egeria densa)对铵氮胁迫的生长和生理响应
钟爱文
江西省·中国科学院庐山植物园, 江西 庐山 332900
摘要:
为了解富营养水体中NH4+-N胁迫对埃格草(Egeria densa)的影响,通过室外模拟试验,研究了埃格草在不同ρ(NH4+-N)(0、0.5、2.0 mg/L)下的RGR(relative growth rate,相对生长率)、R/S(root/shoot ratio,根冠比)、w(SC)(SC为可溶性糖,soluble sugar)、w(淀粉)、w(蔗糖)、w(FAA)(FAA为游离氨基酸,free amino acid)、w(NH4+-N)和w(NO3--N)的变化.结果表明:随着外源ρ(NH4+-N)的增加,埃格草的RGR和R/S呈降低的趋势,并且在ρ(NH4+-N)为2.0 mg/L时显著降低(RGR为P<0.001,R/S为P<0.05);埃格草中w(SC)和w(淀粉)在ρ(NH4+-N)为0.5和2.0 mg/L下有不同程度显著降低[w(SC)为P<0.01和P<0.001,w(淀粉)为P<0.001和P<0.05],w(蔗糖)在ρ(NH4+-N)为2.0 mg/L时显著降低(P<0.001);w(FAA)和w(NH4+-N)有随外源ρ(NH4+-N)升高而升高的趋势,并且在ρ(NH4+-N)为2.0 mg/L时升高显著[w(FAA)为P<0.01,w(NH4+-N)为P<0.05];w(NO3--N)在ρ(NH4+-N)为0.5和2.0 mg/L下有不同程度显著降低(P<0.01和P<0.001).相关分析表明,w(SC)、w(淀粉)和w(蔗糖)之间呈显著正相关,三者与w(FAA)和w(NH4+-N)之间均呈显著负相关,而与w(NO3--N)呈显著正相关;w(FAA)和w(NH4+-N)呈显著正相关,而二者与w(NO3--N)均呈显著负相关.研究显示,NH4+-N影响埃格草的生长,导致C-N代谢的不平衡.
关键词:  埃格草  铵氮  胁迫  碳氮代谢
DOI:10.13198/j.issn.1001-6929.2017.03.04
分类号:X173
基金项目:国家自然科学基金项目(31560149);江西省自然科学基金项目(20151BAB204013)
Ammonium Nitrogen Stress on the Growth and Physiological Responses of Egeria densa
ZHONG Aiwen
Lushan Botanical Garden, Jiangxi Province & the Chinese Academy of Sciences, Lushan 332900, China
Abstract:
In order to understand the effects of ammonium nitrogen (NH4+-N) stress on Egeria densa in eutrophic water bodies, morphological and physiological variations such as relative growth rate (RGR), root/shoot ratio (R/S), soluble sugar (SC), starch, sucrose, free amino acid (FAA), NH4+-N, and nitrate nitrogen (NO3--N) of E. densa at different external NH4+-N concentrations of 0, 0.5 and 2.0 mg/L were investigated in an outdoor simulation experiment. The results showed that the RGR and R/S ratio of E. densa showed a tendency to decrease with increasing external NH4+-N concentration, but decreased significantly with 2.0 mg/L NH4+-N. The SC andstarch contents decreased significantly with 0.5 and 2.0 mg/L NH4+-N. The sucrose content decreased significantly with 2.0 mg/L NH4+-N. The FAA and NH4+-N contents tended to increase with increasing external NH4+-N concentration, but increased significantly with 2.0 mg/L NH4+-N. The NO3--N contents tended to decrease significantly with 0.5 and 2.0 mg/L NH4+-N. The SC, starch, and sucrose contents were positively correlated with each other, but were negatively correlated with FAA and NH4+-N and positively correlated with NO3--N. The FAA and NH4+-N were positively correlated with each other, but were negatively correlated with NO3--N. Our experimental results showed that external NH4+-N can affect the growth of E. densa and lead to an imbalance in carbon-nitrogen metabolism.
Key words:  Egeria densa  ammonium nitrogen  stress  carbon-nitrogen metabolism