【摘要】 试验以辣椒耐盐品种（强丰7301）和盐敏感品种（秋艳）为材料,以NaCl为盐胁迫处理,处理浓度分别为50、100、150、200、250 mmol·L^-1,以不加NaCl为对照（CK）,研究盐胁迫对辣椒幼苗叶绿素荧光参数及相关指标的影响。结果表明,与对照相比,在盐胁迫下两种辣椒品种的实际光化学效率(Ф_PSⅡ)、表观光合电子传递速率（ETR）、最大光化学效率（F_v/F_m）和光化学猝灭系数（qP）等指标均呈下降趋势,而非光化学猝灭系数（qN）、初始荧光（F_o）和质膜相对透性等指标均提高;在NaCl浓度0¹00 mmol·L^-1处理下,两种品种辣椒幼苗叶绿素和可溶性蛋白含量增大,但在NaCl浓度为150²50 mmol·L^-1处理下明显减小;随着处理液浓度增加,秋艳可溶性糖含量在第5天和第10天呈现逐渐升高的趋势,在第15天和第20天先升后降;但强丰7301只在第20天呈现先增加后降低的趋势,其他时间均表现逐渐升高的趋势。试验结果说明,低浓度NaCl(0¹00 mmol·L^-1)胁迫对辣椒影响不明显,高浓度NaCl(150²50 mmol·L^-1)胁迫对辣椒幼苗有很大影响;此外,从试验对各指标的影响发现,强丰7301受盐胁迫的影响程度小于秋艳,表现出较好的耐盐性。表明辣椒耐盐品种具有较好的耐盐性,同时辣椒幼苗的耐盐性与盐胁迫浓度及胁迫时间密切相关。更多还原

【Abstract】 The salt-tolerant（ Qiangfeng 7301） and salt-sensitive（ Qiuyan） pepper varieties were selected to study chlorophyll fluorescence parameters as well as other related indexes change of pepper seedlings under NaCl stress with the concentrations of 50,100,150,200,and 250 mmol·L^-1,respectively,and no NaCl was set as control（ CK） in this experiment. The results showed that salt stress decreased the ФPSⅡ,ETR,Fv/Fm,q P and increased q N,Fo,electrolyte leakage rate of the two pepper varieties. The content of chlorophyll and soluble protein in the two varieties of pepper seedlings increased under NaCl concentration( 0-100 mmol·L^-1),but decreased significantly under NaCl concentration( 150-250 mmol·L^-1) with the concentrations of salt stress increased,soluble sugar content ofQiuyan showed a gradually increasing trend on the 5th and 10 th day and increased firvstly and then decreased on the15 th and 20 th day. However,Qiangfeng 7301 on the 20 th day increased firstly and then reduced,and showed gradually rising trend at other treatment time. It indicated that low concentrations of NaCl( 0-100 mmol·L^-1) had no significant effect on pepper,while high concentrations of NaCl( 150-200 mmol·L^-1) had great influences on pepper seedlings. In addition,it was found that Qiangfeng 7301 showed better salt tolerance than Qiuyan. The results showed that salt tolerance of pepper had better salt tolerance,and the salt tolerance of pepper seedlings was closely related to salt concentrations and stress time.更多还原