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以3种桃砧种质1年生嫁接苗为试材,研究了3种桃砧对盐胁迫生理响应的差异,并对8种桃砧种质进行了耐盐性评价。结果表明:随着盐浓度的增加和处理时间的延长,3种桃砧叶片受害症状逐渐加重,表现为质膜透性和Na~+含量显著增加等生理响应;蒙古扁桃具有较强的渗透调节(可溶性糖和脯氨酸含量高)、离子平衡(Na~+含量低,K~+含量高)和抗氧化(SOD和POD活性高)能力,较好地控制Na~+进入叶片,维持质膜的完整和稳定,表现出较强的耐盐性,毛樱桃与之相反,毛桃介于二者之间;基于叶片质膜相对透性、可溶性糖和游离脯氨酸含量、SOD和POD活性、叶中Na~+和K~+含量所计算隶属函数值进行综合评价,不同树种/品种的桃砧耐盐性排序为蒙古扁桃>山桃>GF677>毛桃>甘肃桃>陕甘山桃>“筑波5号”>毛樱桃。试验结果为桃砧种质耐盐性评价提供了评价指标,并为杂交育种和沿海滩涂发展桃树种植提供了耐盐性种质资源。
The perennial grafted seedlings of three peach anvil germplasms were used as materials to study the differences of physiological responses of three peach cultivars to salt stress. The salt tolerance of eight peach anvil germplasms was evaluated. The results showed that with the increase of salt concentration and the prolongation of treatment time, the symptoms of the damaged leaves of the three peach cultivars gradually aggravated, showing the plasma membrane permeability and the Na + content increased significantly. (High content of soluble sugar and proline), ion balance (low content of Na ~ +, high content of K ~ +) and antioxidation (high activity of SOD and POD), better control of Na ~ + entering leaves, The integrity and stability of the membrane showed a strong salt tolerance. On the contrary, the plump cherry was in between. The relative permeability of the plasma membrane, soluble sugar and free proline content, SOD and POD activities , And the contents of Na ~ + and K ~ + in leaf were comprehensively evaluated. The salt tolerance of peach Anvil for different species / varieties ranked as follows: Almond> Peach> GF677> Peach> Gansu Peach> Tsukuba No. 5 "> Cherry. The test results provided an evaluation index for the evaluation of salt tolerance of peach anvil germplasm and provided salt-tolerant germplasm resources for hybrid breeding and development of peach planting along coastal beach.