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中文摘要：
以2个菊芋品种南芋一号（Nanyu No.1）和青芋二号（Qingyu No.2）为试验材料,采用砂培方式研究了150mmol/L NaCl胁迫下不同浓度KNO3对菊芋幼苗生物量及光合能力的影响。结果表明,1）无NaCl胁迫下,随KNO3浓度的增加,2个菊芋品种幼苗生物量,叶绿素含量及净光合速率均出现不同程度的减小。2）150mmol/LNaCl胁迫下,KNO3浓度的增加,提高了菊芋幼苗地上部和地下部的K＋/Na＋以及叶片中的叶绿素含量。3）不同菊芋品种幼苗响应钾素营养缓解盐害的敏感性不同,150mmol/L NaCl胁迫下,外源KNO3浓度分别为20和10mmol/L时南芋一号和青芋二号缓解NaCl胁迫的效果最明显,超过最适浓度,缓解效果降低。4）KNO3对南芋一号在150mmol/L NaCl胁迫的缓解效果优于青芋二号。试验结果表明150mmol/L NaCl胁迫下,适宜的外源KNO3有效地缓解了盐分胁迫,促进了不同菊芋品种幼苗光合能力的提高以及生物量的积累。
英文摘要：
Effects of KNO3 under salt stress on the biomass and photosynthetic capacity of two varieties of Helianthus tuberosus seedlings（Nanyu No.1 and Qingyu No.2） treated with NaCl（0 and 150 mmol/L） and different levels of KNO3（2.5,5,10,20 and 30 mmol/L） were studied by pot/sand experiments in a greenhouse.1） Compared with the control（NaCl 0 mmol/L）,the biomass,chlorophyll（Chl） content,and net photosynthetic rate（Pn） of two varieties of H.tuberosus seedlings declined as the KNO3 concentrations increased.2） Under 150 mmol/L NaCl stress,the K＋/Na＋（shoot and root） ratio and chlorophyll content of different varieties of H.tuberosus seedlings increased with increasing concentrations of KNO3.3） Sensitivities of KNO3 for alleviating salt injury differed between varieties.Effects of KNO3（20 and 10 mmol/L） significantly alleviated salt injury caused by 150 mmol/L NaCl stress for Nanyu No.1 and Qingyu No.2.4） Under the same treatment,KNO3 alleviated injury caused by 150 mmol/L NaCl stress better in Nanyu No.1 than in Qingyu No.2.In conclusion,suitable exogenous KNO3 can alleviate salt injury and promote photosynthetic capacity and biomass accumulation in varieties of H.tuberosus seedlings.
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