摘要
以自毒性较强的菊花品种‘高压太子’插穗为材料,调查了菊花枯落物、叶、茎、根系和根际土壤水浸液处理对其扦插苗生长和生理指标的影响,以探讨菊花自毒作用机制。结果表明,菊花不同部位水浸液处理对其扦插生根的根长、鲜重及根数均有抑制作用,并以叶和枯落物水浸液对根长的抑制作用最强,且均达到极显著水平;随水浸液浓度的升高,其对扦插苗根长、鲜重及根数的抑制作用越明显。水浸液处理导致扦插苗叶片可溶性糖、可溶性蛋白和叶绿素含量显著下降,显著抑制根系脱氢酶与叶片硝酸还原酶活性。可见,菊花地上部和根际土水浸液可能通过抑制其扦插苗根系脱氢酶与叶片硝酸还原酶活性,降低叶片叶绿素、可溶性糖和可溶性蛋白的含量,在营养水平上抑制不定根的形成而产生明显的自毒效应,且该自毒作用表现出明显的浓度梯度效应和部位差异。
Effects of aquatic extracts from different parts and rhizospheric soil of cultivated chrysanthemum species 'Gaoyataizi' on the rooting of cuttings of the same species were studied.The results showed that aquatic extracts,especially leaf and litter extracts,had significant inhibitory effects on root length,root fresh weight and root number of the same chrysanthemum species,compared to control.Aquatic extracts from all varieties had significant inhibitory effects on the root length,root fresh weight and root number of cuttings with increasing concentrations of tissue extracts;However,the effect was weak at lower concentration.Higher concentration of extracts inhibited activities of root dehydrogenase,nitrate reductase(NiR),reduced the contents of soluble sugar and soluble protein,and chlorophyll content of leaves in cuttings.By means of above mechanism,aquatic extract of above ground and rhizospheric soil had significant autotoxic effects on the rooting of chrysanthemum on the nutrion level,and autotoxic effects showed obvious difference among different concentration and varieties of extract.
出处
《西北植物学报》
CAS
CSCD
北大核心
2010年第4期762-768,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
河南科技学院高层次人才科研项目启动基金(20070026)
关键词
菊花
自毒作用
化感作用
扦插
chrysanthemum
autotoxicity
allelopathy
cutting propagation
