钠盐胁迫对不同辣度辣椒的耐受性影响研究初探

Preliminary Study on the Effect of Sodium Salt Stress on the Tolerance of Pepper with Different Pungency Degree

土壤盐渍化是影响我国农业生产的主要非生物胁迫,严重影响了农作物的生长并导致减产。本研究选取适合黑龙江省西部地区生产和消费,有代表性的2个辣椒品种"农家辣妹子"(高辣度)和"特大甜椒王"(低辣度)为实验材料,分析不同辣度辣椒品种在低、中、高浓度钠盐胁迫下株高、茎粗、过氧化物酶(POD)活性、可溶性糖含量、可溶性蛋白含量的变化。研究结果表明:低、中浓度钠盐胁迫可以提高高辣度"农家辣妹子"的株高和茎粗生长、POD活性和叶片中渗透调节物质(可溶性糖和可溶性蛋白)的含量,而对低辣度"特大甜椒王"则产生不同程度的抑制。因此,高辣度"农家辣妹子"耐盐性较好,可耐低、中钠盐胁迫,低辣度"特大甜椒王"不耐盐。另外,POD、可溶性糖和可溶性蛋白可作为不同辣度辣椒对钠盐胁迫的逆境抗性响应指标,为选育耐钠盐胁迫辣椒新品种提供鉴定参考和理论依据。

Soil salinization is the main abiotic stress affecting agricultural production in China, which seriously affect crop growth and leading to yield reduction. In this study, two representative pepper varieties "Peasant Hot Girl"(high pungency degree) and "Super Sweet Pepper King"(low pungency degree) were selected as experimental materials to analyze plant height, stem diameter, peroxidase(POD) activity, soluble sugar content and soluble protein content of pepper varieties with different pungency degree under low, medium and high sodium salt stress. The results showed that the plant height, stem diameter, POD activity and osmotic regulators(soluble sugar and soluble protein)content in "Peasant Hot Girl" were increased under low and moderate sodium stress, while the "Super Sweet Pepper King" with low and medium sodium stress was inhibited in varying degrees. Therefore, the "Peasant Hot Girl" have better salt tolerance, can withstand low and medium sodium salt stress, and the "Super Sweet Pepper King" is not salt-tolerant. In addition, POD, soluble sugar and soluble protein can be used as response indicators of stress resistance to sodium salt stress in pepper with different degrees of hot pepper, providing identification reference and theoretical basis for breeding new varieties of pepper resistant to sodium salt stress.