5个杂交桑种质的耐盐性评价

为了筛选出耐盐性比较高的杂交桑品种,笔者选择了‘冀桑3号’、‘鲁杂1号’、‘浙杂1号’、‘桂桑优12号’和‘桂桑优62号’5个广泛种植的杂交桑种质为研究对象,通过盐胁迫下幼苗生长试验,综合分析5个种质在NaCl胁迫下幼苗株高、植株生物量、叶片叶绿素含量、净光合速率、气孔导度、脯氨酸含量、丙二醛含量等生理生化指标。结果表明,6‰ NaCl处理各种质桑树幼苗发现,盐胁迫下各种质幼苗的生长发育、株高和生物量等都受到了不同程度的抑制作用。同时测定了盐胁迫下各种质桑树幼苗的叶绿素含量和光合生理参数,综合评判‘桂桑优62号’仅表现出轻微叶片黄化,植株生长良好,株高和生物量变化较小,具有较强的耐盐性。桑树作为生态林树种在水土保持、退耕还林、盐碱地改良等方面也发挥了重要作用,该试验为盐碱地的治理提供参考依据。

Evaluation of the Salt Tolerance of Five Hybrid Mulberry Germplasms

In order to select varieties with high salt tolerance from widely planted hybrid mulberry germplasms, the authors took ‘Jisang 3’, ‘Luza 1’, ‘Zheza 1’, ‘Guisangyou 12’ and ‘Guisangyou 62’ as the research objects. Through the seedling growth test under salt stress, the physiological and biochemical indexes of seedling height, plant biomass, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, proline content and malondialdehyde content were analyzed. The results showed that in 6‰ NaCl treatment, the growth and development, plant height and biomass of mulberry seedlings were inhibited to varying degrees. At the same time, the chlorophyll content and photosynthetic physiological parameters of mulberry seedlings under salt stress were measured. As a result, ‘Guisangyou 62’ showed only slight leaf yellowing, good plant growth, little change in plant height and biomass, and strong salt tolerance. As an ecological forest tree species, mulberry plays an important role in soil and water conservation, returning farmland to forest and improving saline-alkali land.