木薯器官及其腐解物水浸液对橡胶树白根病病菌的化感作用

本文采用菌丝生长速率法研究木薯根、茎、叶及其腐解物水浸液对橡胶树白根病病菌的化感效果。结果表明:(1)根水浸液在处理后2～5 d均呈现出显著的化感促进效果,不同浓度之间的化感效果差异不明显;叶水浸液在处理后2 d和5 d均有显著的化感促进效果,处理后3 d和4 d,仅10和100 mg/mL的叶水浸液呈现显著的化感促进效果;茎水浸液在处理后2～3 d的化感促进效果均不明显,但100 mg/mL的茎水浸液在处理后4 d和1000 mg/mL茎水浸液在处理后5 d呈现显著的化感促进效果。(2)根腐解物水浸液化感抑制效果随处理浓度的增加而增加,浓度增至200 mg/mL时差异达到显著水平;叶腐解物水浸液化感抑制作用随浓度的增加而逐渐下降,当浓度增至200 mg/mL时化感效果不明显;茎腐解物水浸液均有显著的化感抑制作用。

Allelopathy of Water Extracts from Cassava Organs and Decomposing Products to Rigidoporus lignosus of Hevea brasiliensis

The allelopathic effect of water extracts from the root, stem or leaf of cassava and the decomposing products on the Rigidoporus lignosus (Klotzsch) Imaz. of rubber tree at three concentrations and different days after treatment were studied using the mycelial growth rate method. The water extracts from the root of cassava could significantly promote the growth of Rigidoporus lignosus (Klotzsch) Imaz. between the 2-5th day after treatment, but there was no significant difference among the three concentrations. The promotion effect of the three concentrations extracts from the leaf was significant at the 2th or 5th day after treatment, while the promotion effect to the 10 mg/mL and 100 mg/mL extracts was significant at the 3th day or 4th day. The allelopathic promotion effect of the extracts from the stem was not obvious at the 2th or 3th day, while there was a significantly positive effect of the 100 mg/mL extracts at the 4th and of 1000 mg/mL extracts at the 5th day. The allelopathic inhibition effect of the extracts from the root decomposing product increased gradually with the concentration increased. The effect was significant when the concentration increased to 200 mg/mL. With the concentration increased, the inhibition effect of the extracts from the leaf decomposing product decreased gradually. The effect was no significant when the concentration increased to 200 mg/mL. The inhibition effect of the extracts from the stem decomposing product was significant.