摘要
以果桑品种大10、红果2号、安杂1号和台湾72C002为试验材料,研究土壤中不同浓度盐分胁迫对果桑幼苗生理特性的影响,作为探讨果桑幼苗对盐分胁迫的响应机制及西部盐渍化地区栽植果桑品种的耐盐性能评价依据。土壤低浓度盐分(0.1%NaCl)胁迫下,安杂1号和台湾72C002的幼苗叶片净光合速率(Pn)、气孔导度(Gs)、PSⅡ最大光化学效率(Fv/Fm)、叶绿素含量及叶片生物量均增加,并且即使在高浓度盐分(0.5%NaCl)胁迫下,安杂1号幼苗叶片的Pn、Gs、丙二醛(MDA)和可溶性糖含量也下降较少,与对照相比均未达到差异显著水平(P>0.05),表明安杂1号具有抵御高浓度盐分胁迫的能力。大10在高浓度盐分(0.5%NaCl)胁迫下,幼苗叶片的Pn、Gs、Fv/Fm、叶绿素含量及叶片生物量与对照相比显著降低(P<0.05),表明该品种抵御高浓度盐分胁迫的能力较差。在盐分胁迫下,不同果桑品种幼苗叶片中的过氧化物酶(POD)活性不同,安杂1号的POD活性显著高于其它果桑品种,与大10相比达到差异显著水平(P<0.05),提示在果桑幼苗对盐分胁迫的响应过程中,叶片中高POD活性可能起到一定的调节作用,而不同品种间表现出的酶活性差异性可能与品种的耐盐能力有关。
In order to provide reference for exploring the response mechanism of fruit mulberry seedlings to salt stress and for evaluating salt tolerance of fruit mulberry varieties planted in the western salinization region of China,4 fruit mulberry varieties namely Da 10,Hongguo 2,Anza 1 and Taiwan 72C002 were used to investigate the impact of various salt stress on physiological characteristics of fruit mulberry seedlings.The results indicated that,under low salt stress（0.1% NaCl）,the net photosynthetic rate（Pn）,stomatal conductance（Gs）,maximal quantum yield of PS Ⅱ photochemistry（Fv/Fm）,chlorophyll content and leaf biomass were all increased in seedling leaves of Anza 1 and Taiwan 72C002.Nevertheless,even under high salt stress（0.5% NaCl）,Pn,Gs,malonaldehyde（MDA） and soluble sugar content only declined slightly in seedling leaves of Anza 1.The difference did not reach significant level compared to the control（P〉0.05）,which showed that Anza 1 has good resistance to high salt stress.Under high salt stress（0.5% NaCl）,Pn,Gs,Fv/Fm,chlorophyll content and leaf biomass in Da 10 were significantly lower than those of the control（P〈0.05）,indicating that this variety has poor resistance to high salt stress.Under salt stress,the peroxidase（POD） activity in seedling leaves of different fruit mulberry varieties was different,among which Anza 1 had a POD activity remarkably higher than the other varieties,and showed significant difference compared to Da 10（P〈0.05）.These results suggest that,in response to salt stress,high POD activity in mulberry leaves have certain osmotic regulatory functions,and the difference of POD activity in different varieties is related with their tolerance to salt stress.
出处
《蚕业科学》
CAS
CSCD
北大核心
2012年第1期25-31,共7页
ACTA SERICOLOGICA SINICA
基金
现代农业产业技术体系专项(No.CARS-22)
关键词
果桑幼苗
氯化钠胁迫
光合特性
过氧化物酶
渗透调节物质
Mulberry seedling
NaCI stress
Photosynthetic characteristic
Peroxidase
Osmotic regulatory substances
