NaCl胁迫对3个楸树无性系苗期根系特征的影响  

Effect of NaCl stress on root characteristics of three clones of Catalpa bungei at seedling stage

作　　者：吴统贵[1] 顾沈华 颜福彬 吴敏霞 王臣[1] 虞木奎[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400 [2]嘉兴市林特技术推广总站,浙江嘉兴314050 [3]温岭市林业技术推广站,浙江温岭317500

出　　处：《植物资源与环境学报》2013年第2期67-71,共5页Journal of Plant Resources and Environment

基　　金：浙江省科学技术厅重大科技专项(2011C12016);浙江省自然科学基金资助项目(LY12C16008)

摘　　要：以3个楸树(Catalpa bungei C.A.Meyer)无性系(02-2-5、YQ1和07-1)扦插苗为研究对象,对质量浓度0.00%(对照)、0.10%、0.20%、0.25%、0.30%和0.40%NaCl胁迫条件下其细根(直径Φ<2 mm)和粗根(Φ≥2 mm)的长度、表面积和体积等形态学特征以及根系活力的变化规律进行了研究。结果表明:随NaCl质量浓度的提高,各无性系细根及粗根的长度、表面积和体积以及根系活力均逐渐降低,且均明显低于对照,部分处理与对照间的差异具有统计学意义(P<0.05)。在NaCl胁迫条件下,各无性系间根长和根表面积降幅的差异不明显且无统计学意义(P>0.05);但在中度(NaCl质量浓度0.20%和0.25%)及重度(NaCl质量浓度0.30%和0.40%)胁迫条件下,无性系02-2-5根体积的降幅显著小于另外2个无性系;而在NaCl胁迫条件下无性系02-2-5根系活力的降幅也显著小于另外2个无性系。研究结果显示:在NaCl胁迫条件下3个楸树无性系扦插苗根系的生长均受到抑制,但各无性系对NaCl胁迫的耐性有一定差异,其中无性系02-2-5对NaCl胁迫的耐性较强;此外,根系活力或其降幅可作为楸树无性系耐盐能力的评价指标之一。Taking cutting seedlings of three clones （02-2-5, YQ1 and 07-1 ） of Catalpa bungei C. A. Meyer as experimental materials, change regularity of morphological characteristics including length, surface area and volume of fine root （diameter Φ〈2 mm） and coarse root （Φ〉2 mm） and root activity was studied under condition of NaCl stress with mass ratios of 0.00% （ CK）, 0.10%, 0.20%, 0.25%, 0.30% and 0.40%. The results show that length, surface area and volume of fine root and coarse root and root activity of three clones gradually decrease with rising of NaCl mass ratio, which are all obviously lower than those of the control and there is the statistical significance （ P〈0.05 ） in differences of some treatments with those of the control. Under condition of NaCl stress, there is no obvious difference in decreasing range of root length and root surface area among three clones without statistical significance （ P〉0.05 ）. But under conditions of medium （ NaCl mass ratio of 0.20% and 0.25% ） and heavy （ NaCl mass ratio of 0.30% and 0.40% ） stresses, decreasing range of root volume of clone 02 -2 -5 is significantly lower than that of other two clones, and under NaCl stress, decreasing range of root activity of clone 02-2-5 is also significantly lower than that of other two clones. It is suggested that root growth of cutting seedlings of three clones of C. bungei all could be inhibited under NaCI stress, but the tolerance of three clones to NaC1 stress is different, in which, the tolerance of clone 02-2-5 to NaCl stress is stronger. Moreover, root activity or its decreasing range can be used as one of evaluating indexes for salt tolerance of C. bungei clones.

关 键 词：楸树 NACL胁迫 根系形态特征 根系活力 耐盐性 

分 类 号：Q945.78[生物学—植物学] S792.99[农业科学—林木遗传育种]