Phytotoxic effect of Haldina cordifolia on germination, seedling growth and root cell viability of weeds and crop plants

Publication date: Available online 7 July 2016 Source:NJAS - Wageningen Journal of Life Sciences Author(s): Rungcharn Suksungworn, Nuttha Sanevas, Narong Wongkantrakorn, Nitikan Fangern, Srunya Vajrodaya, Sutsawat Duangsrisai The extracts of wood, bark, and leaves of Haldina cordifolia were evaluated for their phytotoxicity on seed germination, seedling growth, and root cell viability in two weeds (Mimosa pigra and Cenchrus echinatus) and two crop plants (Vigna radiata and Oryza sativa cv. Khao Dawk Mali 105). Seeds were grown in petri dishes and treated with 5ml of extracts at various concentrations: 0.5, 1.0, 5.0, and 10.0mg/ml. The inhibitory effect on seed germination increased with increasing concentration of the extract treatment. Bark extract was the most toxic at the highest concentration, causing total inhibition of germination in all tested seeds except in V. radiata. Low concentrations (0.5 and 1.0mg/ml) of wood extract inhibited shoot and root growth in C. echinatus by 31.0%–56.0% and 67.0%–71.0%, respectively. Interestingly, it promoted root growth in M. pigra by 106.9%–108.8% (at low concentrations) and in V. radiata (at all concentrations) by 108.1%–108.9% (shoot) and 108.8%–120.1% (root). Bark extract inhibited seedling growth in all tested plants at different levels. Strong inhibition was found in roots of O. sativa (3.0%–4.0%). The result from Evans blue uptake study suggested that the H. cordifolia extract did not directly affect the roo...

Source: NJAS Wageningen Journal of Life Sciences - August 3, 2016 Category: Biology Source Type: research