Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Plant Protection submitted time 2018-07-18 Cooperative journals: 《广西植物》
Abstract： With Eucalyptus urophylla × E. grandis DH3229 seedlings as test material, a experiment was conducted to study nitric oxide(NO) alleviate the toxic effects of Aluminum(Al). In this experiment, E. urophylla × E. grandis DH3229 were subjected to six treatments (two levels of Al stress and three levels of SNP). In this paper, we measured four plant growth indexs (Root Biomass, Stem Biomass, Leaf Biomass, and Root stem ratio) and nine plant physiologic indexs (Chlorophyll a, Chlorophyll b, Chlorophyll a+b, Chlorophyll a/b, MDA conten, Relative electrical conductivity, Free proline content, Soluble sugar content, and SOD content) among different treatments. We used one-way ANOVAs and Duncan multiple-range test to exam the differences between four plant growth indexs and nine plant physiologic indexs in six treatments. And then, we used PCA (principle conponent analysis) to reduce the number of dimensions without much loss of information based on similarities and differences, and we defined a limited number of “principal components” that describe independent variation structures in the data. In the last, we choose a appropriate SNP content to alleviate the toxic effects of Al. The results showed that: Al stress significantly inhibited root, stem, leaf biomass of seedlings, and the content of leaf Chl a, Chl a+b. Meanwhile Al stress significantly increased the relative electrical conductivity, MDA, SOD, and proline content. The application of 10 μmolL·-1 SNP increased siginificantly root and leaf biomass, the content of Chl a and Chl b, Chl a/b under Al stress; and decreased siginificantly the relative electrical conductivity, MDA, and proline content. Apply an appropriate amount of SNP could effectively alleviate the toxic effects of Al on Eucalyptus seedling growth. However, high concentration SNP could inhibit the growth of Eucalyptus seedling. These conclusions can serve as an important guide for enhancing the resistance to Al toxicity of Eucalyptus species growth on acid soil
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