橡胶叶水浸提液对花生幼苗早期根系形态及其生理特性的影响.pdfVIP

热带作物学报 2014，35(2)：217—222 ChineseJoumalofTropicalCro 橡胶叶水浸提液对花生幼苗早期根系形态 及其生理特性的影响 杨华庚，颜速亮，陈慧娟 海南大学农学院．海南海 口 570228 摘 要 为深入理解橡胶树的化感抑制作用．采用适当浓度的橡胶叶水浸提液处理刚萌动的花生种子 10d，测 定花生幼苗早期根系形态及其生理指标 结果表明：橡胶叶水浸提液能显著降低花生幼苗胚根长度、苗高、根 鲜重 、地上部鲜重 以及根冠 比．对根生长的抑制作用比地上部强烈；能显著降低根系总长 、根表面积、根体积 和根尖数．但对根平均直径有轻微的促进作用，与对照相 比，差异不显著 ；能显著降低根系SOD、POD、CAT 活性、可溶性蛋 白质、可溶性糖、脯氨酸含量 以及根系活力，却 明显增加根系 MDA含量和相对电导率。说明橡 胶叶水浸提液可通过破坏花生幼苗的抗氧化防御机制 ．降低其渗透调节能力，减少根系的吸收面积 ，抑制根系 的吸收活性来抑制花生幼苗的生长 关键词 橡胶树 ；化感作用 ；根系形态 ；抗氧化机制 ；渗透调节 中图分类号 $794．1 文献标识码 A EffectsofAqueousExtractsfrom LeavesofRubberTree (Heveabrasiliensis)onRootMorphologicaland PhysiologicalCharacteristicsofEarly Seedlings ofPeanut(ArachishypogaeaL．) YANGHuageng，YAN Suliang，CHENHuijuan CollegeofAgronomy,HainanUniversity,Haikou，Hainan570228,China Abstract Germinating peanut seeds were treated with suitable concentration of the aqueous extracts from the leaves of rubber tree for 10 days，and the determination ofrootmorphology and physiologicalindices ofearly seedlings ofpeanutwasused to geta betterunderstanding ofthe allelopathic inhibition ofurbber trees．The results showed thattheaqueousextractsfrom theleavesofurbbertreemay significantlyreducedradiclelength， shootlength，rootfreshweight，top fresh weight，rootto shootratio，but inhibited growth much more in roots than thatin shoots．Andmay significantly decreased totalrootlength，rootsurfacearea，rootvolume，numberof roottips． However．the averagerootdiametertended to increase slightly，no statistically significantdifferences were found in the treatment and contro1．And significantly decreased SOD，POD，CAT activity，soluble protein， soluble sugar, proline content and root activity． wh