Abstract Salt stress negatively impacted growth and physiological processes in plants, and the effects involved oxidative damages within cell and cell organelles. In this study, four different genotypes (CG, KM, XX, and ZM-H) of Actinidia germplasm resources were exposed to CK, 0.3 %, and 0.6 % NaCl concentrations for 15 days. We measured the growth, physiological and biochemical indicators in leaves, shoots, and roots. The relative lateral branch length (RLBL), plant fresh weight (PFW), plant dry weight (PDW), and plant relative water contents (PRWC) were decreased in all genotypes under salinity stress. Whereas, the Salt damage index (SDI, sodium ions (Na+) and chloride ions (Cl−) increased in all kiwifruit genotypes under high salt conditions. On the contrary, the potassium ion (K+) and K+/Na+ ratio was decreased in all genotypes under higher salt conditions. For organic osmolytes, Proline increased and total soluble sugars (TSS) decreased in all genotypes under high salt. The enzymatic activities of APX, GST, and GR were increased in all kiwifruit genotypes when subjected to higher levels of NaCl stress. The salt tolerance of different kiwifruit genotypes was assessed by principal component analysis (PCA), and the order of salt tolerance was as following: ZM-H > CG > XX > KM. Hence, the ZM-H from A. valvata Dunn. possessed strong tolerance against salt stress and could be an important germplasm resource for the salt tolerance rootstock breeding program of kiwifruit.

中文翻译：

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盐胁迫对四种猕猴桃基因型生长、生理生化特性的影响

摘要 盐胁迫对植物的生长和生理过程产生负面影响，其影响涉及细胞和细胞器内的氧化损伤。在本研究中，将猕猴桃种质资源的四种不同基因型（CG、KM、XX 和 ZM-H）暴露于 CK、0.3% 和 0.6% NaCl 浓度 15 天。我们测量了叶、芽和根的生长、生理和生化指标。在盐胁迫下，所有基因型的相对侧枝长度（RLBL）、植物鲜重（PFW）、植物干重（PDW）和植物相对水分含量（PRWC）均降低。而在高盐条件下，所有猕猴桃基因型的盐害指数（SDI、钠离子 (Na+) 和氯离子 (Cl−)）均增加。相反，在高盐条件下，所有基因型的钾离子 (K+) 和 K+/Na+ 比率均降低。对于有机渗透物，在高盐条件下，所有基因型的脯氨酸增加，总可溶性糖 (TSS) 减少。当受到更高水平的 NaCl 胁迫时，APX、GST 和 GR 的酶活性在所有猕猴桃基因型中均增加。采用主成分分析法（PCA）评估不同猕猴桃基因型的耐盐性，耐盐性顺序为：ZM-H>CG>XX>KM。因此，来自 A. valvata Dunn 的 ZM-H。具有较强的耐盐性，可作为猕猴桃耐盐砧木育种的重要种质资源。当受到更高水平的 NaCl 胁迫时，APX、GST 和 GR 的酶活性在所有猕猴桃基因型中均增加。采用主成分分析法（PCA）评估不同猕猴桃基因型的耐盐性，耐盐性顺序为：ZM-H>CG>XX>KM。因此，来自 A. valvata Dunn 的 ZM-H。具有较强的耐盐性，可作为猕猴桃耐盐砧木育种的重要种质资源。当受到更高水平的 NaCl 胁迫时，APX、GST 和 GR 的酶活性在所有猕猴桃基因型中均增加。采用主成分分析法（PCA）评估不同猕猴桃基因型的耐盐性，耐盐性顺序为：ZM-H>CG>XX>KM。因此，来自 A. valvata Dunn 的 ZM-H。具有较强的耐盐性，可作为猕猴桃耐盐砧木育种的重要种质资源。瓦尔瓦塔·邓恩 具有较强的耐盐性，可作为猕猴桃耐盐砧木育种的重要种质资源。瓦尔瓦塔·邓恩 具有较强的耐盐性，可作为猕猴桃耐盐砧木育种的重要种质资源。