【作者】 郭艳茹；

【导师】 詹亚光；

【作者基本信息】 东北林业大学 ， 遗传学， 2006， 硕士

【摘要】 本研究采用模拟大庆地区典型碱斑土盐浓度的溶液对30种应试树种（28种乡土树种,2种引进树种）分别进行0.5倍（0.197%）、1.0倍（0.394%）、2.0倍（0.788%）、2.5倍（0.985%）盐浓度的处理,于20天和30天后对应试树种的脯氨酸、过氧化物酶（SOD）、超氧化物歧化酶（POD）、细胞膜通透性、光合速率等耐盐碱性生理生化指标进行分析,初步筛选出沙枣、枸杞、小叶锦鸡儿、白榆、花楸5种树种为适合大庆地区的耐盐碱绿化树种,同时对筛选出的沙枣、花楸、小叶锦鸡儿3种耐盐树种进行组培快繁技术研究。 1 盐处理对树种生理生化指标的影响 随盐碱处理液浓度的增加,应试树种的脯氨酸含量基本上呈现上升趋势;SOD活性也呈现上升的趋势;而POD活性则呈现先下降后上升再下降的趋势;相对电导率呈现明显的上升趋势,其中在2.5倍盐碱胁迫液处理20天时应试树种的相对电导率均明显高于对照;光合速率在0.5倍、1.0倍盐碱处理液下变化趋势一致性较差,但在2.5倍盐碱处理液下应试树种的光合速率均明显低于对照。 2 耐盐碱树种的筛选 参照各应试树种被测生理生化指标对4种盐处理的响应程度,对各树种的耐盐碱能力综合分析并排序,初步确定沙枣、枸杞、小叶锦鸡儿、白榆和花楸为适合大庆地区的耐盐碱绿化树种。 3 耐盐树种的组培快繁技术研究 沙枣（Elaeagnus angustifolia）在MS+6-BA0.5mg·L^-1条件下能产生试管丛生芽,其茎段在MS+6-BA（0.5～1.0）mg·L^-1+NAA0.8mg·L^-1条件下对愈伤组织不定芽效果最佳。试管苗用IBA50mg·L^-1处理1h,接种到无激素培养基中,生根率为94%。 以花楸（Sorbus pohuashanensis（Hance） Hedl.）带腋芽茎节为外植体,最佳基本培养基为MS培养基;芽诱导培养基为1/2MS+6-BA2.5mg·L^-1+2.4-D0.5mg·L^-1;增殖培养基为MS+6-BA（1.6～2.1）mg·L^-1+NAA（O.14～0.23）mg·L^-1,平均繁殖系数达到13倍以上;继代壮苗培养基为MS+6-BA0.2mg·L^-1+IBA0.2mg·L^-1;在1/2MS+IBA0.3mg·L^-1培养基上,平均生根数为5.96,生根率达90.20%。将生根后的组培苗移栽至腐殖土:泥炭土:河沙（比例为3∶2∶1）的基质中,成活率达95.55%。 以小叶锦鸡儿（Caragana microphylla Lam.）茎段为外植体,最适的芽诱导培养基是MS+6-BA0.5mg·L^-1和IAA0.01mg·L^-1;生根培养基是1/2MS+IAA0.5mg·L^-1。更多还原

【Abstract】 Thirty native and introduced tree species were treated with 0.5 times （0.197%）、 1.0 times （0.394%）、 2.0 times （0.788%）、 2.5 times （0.985%） salt solution, which simulated salt concentration of alkaline patch in Daqing. Proline, peroxidase（POD）, superoxide dismutase（SOD）, cell membrane permeability, photosynthesis rate were analyzed after 20 and 30 salt treatment. The results showed ascension and descent ranges of different trees were different. Five tree species, namely Elaeagnus angustifolia, Lycium brabarum L., Caragana microphylla Lam., Ulmus pumila L. and Sorbus pohuashanensis （Hance） Hedl.were primarily proved to have stronger salt-resistance ability. At the same time, Elaeagnus angustifolia, Caragana microphylla Lam, and Sorbus pohuashanensis （Hance） Hedl.were also used to study their tissue culture propagation.1. Effects of salt treatment on related biophysical-chemical indexUnder salt treatment, the content of free praline and SOD activity increased with the concentration of salt;POD activity was descended firstly, and ascended then descended with increasing salt concentration;Relative conductance responded to salt treatment appeared the same trend with free praline and SOD activity, and under 2.5 times salt concentration on 20d, relative conductance was significantly higher than CK;Photosynthetic rate of tree species responded to 0.5 times 、 1.0 times salt concentration were different. However, photosynthetic rate was distinctly lower than that of CKunder 2.5 times salt concentration.2. Selecting Salt-tolerance treesIntegrated rating law was used to select salt-tolerance trees from the above tested biophysical-chemical index. The trees’ salt-tolerance was Elaeagnus angustifolia>Lycium brabarum L.> Caragana microphylla Lam.> Ulmus pumila L.> Sorbus pohuashanensis （Hance） Hedl.3. Study on tissue culture propagation in salt-tolerant treesElaeagnus angustifolia could produce multiple bud clumps in Ms + 6-BA 0.5 mg·L^-1. Under MS+6-BA0.5-1.0mg·L^-1+NAA0.8mg·L^-1, Elaeagnus angustifolia stems could induce a large number of callus shoots. After tube seedlings were soaked by IBA50mg·L^-1 forlh, and cultured to media without hormones, the rooting rate is 94%.Stem segments with axillary buds in Sorbus pohuashanensis （Hance） Hedl.were chosen as explants to study tissue culture propagation technology. The results showed that the best basic medium was MS;axillary buds were induced successfully on MS basal media supplemented with 6-BA2.5mg·L^-1and 2.4-D0.5mg·L^-1;the optimum medium for bud proliferation was MS+6-BA（1.6-2.1）mg·L^-1 + NAA （0.14-0.23） mg·L^-1;the shoots grew strongly on MS+6-BA1.2mg·L^-1+IBA0.2mg·L^-1;and l/2MS+IBA0.3mg·L^-1 was the best medium for shootrooting, the rooting rate was 90.20%, and the average root number of 5.96;plantlets survival rate reached 95.55% when transplanted on the mixture （soil3: peat moss2: sandl）.Stem segments of Caragana microphylla Lam. were used to optimize the tissue culture condition. The results showed that MS+6-BA0.5mg-L"1+IAA0.01mg-L’1 was the optimum medium for inducing bud, l/2MS+IAA0.5mg-L"’ best fitting for rooting.更多还原