[Objective] This study was to investigate the allelopathic effects of J.curcas leaf leachates on seedling growth and antioxidative enzymes,and thus to reveal physiologically allelopathic effects of J.curcas trees on u...[Objective] This study was to investigate the allelopathic effects of J.curcas leaf leachates on seedling growth and antioxidative enzymes,and thus to reveal physiologically allelopathic effects of J.curcas trees on undergrowth plants.[Method] The allelopathic effects of leaf leachates of Jatropha curcas amended into soil were determined on the growth,proline and malondialdehyde（MDA） contentas well as superoxide dismutase（SOD）,catalase（CAT）,ascorbate peroxidase（APX）,guaiacol peroxidase（POD） in roots of marigold（Tagetes erecta） seedlings.[Results] The application of leaf leachates of J.curcas in the soil significantly inhibited the shoot and root length of marigold compared to un-amended soils.The leaf leachates increased the O-2,H2O2,MDA and proline content in the roots of marigold seedlings.The effects increased with the ascending of leaf leachates concentration.In addition,superoxide dismutase（SOD） and guaiacol peroxidase（POD） were not remarkably affected by the leachates at lower concentrations,but at higher concentration,SOD activity was ascended.Similarly,the activities of CAT and APX were also significantly increased with the increase of leachates concentrations.[Conclusion] These results show that J.curcas can release the phytotoxic compound（s） into soil,which are inhibitory to certain test species by interfering with physiological process.展开更多
In order to domesticate H. azurea （Halopegia azurea）, acclimatization of rhizome＇s cuttings and young shoots in farms was tested at Nkol Evodo village from February 2012 to June 2012. The best substrate for propaga...In order to domesticate H. azurea （Halopegia azurea）, acclimatization of rhizome＇s cuttings and young shoots in farms was tested at Nkol Evodo village from February 2012 to June 2012. The best substrate for propagation was assessed： （0） wetland; （1） sand/wetland; （2） sawdust/wetland; （3） sand/sawdust/wetland. Young shoots＇ growth was observed in situ for 8 weeks. A significant difference （P 〈 0.05） was observed in the appearance of young shoots and leaves in nursery. The highest average number of young shoots and leaves （0.62 ± 0.09） was found in substrates 0 and 1, the lowest （0.31 ± 0.08） in substrate 3. Substrate 3 showed the lowest number of young leaves （0.41 ± 0.16） and substrate 2 the highest （0.97 ±0.24）. A significant difference in the mortality rate of cuttings （P 〈 0.05） was observed： 68.75% and 53.12% in substrates 2 and 3, respectively. On farm, new leaves and young shoots＇ appearance showed a highly significant difference. Plants growing in substrates 2 and 3 showed the highest number of leaves. New shoots developed only in plants growing in substrates 0 and 1. These results suggest that it is possible to domesticate H. azurea for leaves＇ production in quantity and quality, and open up better opportunities for its cultivation.展开更多
基金Supported by National Key Technologies R&D Program of China(2008BAK51B01-7-3)~~
文摘[Objective] This study was to investigate the allelopathic effects of J.curcas leaf leachates on seedling growth and antioxidative enzymes,and thus to reveal physiologically allelopathic effects of J.curcas trees on undergrowth plants.[Method] The allelopathic effects of leaf leachates of Jatropha curcas amended into soil were determined on the growth,proline and malondialdehyde（MDA） contentas well as superoxide dismutase（SOD）,catalase（CAT）,ascorbate peroxidase（APX）,guaiacol peroxidase（POD） in roots of marigold（Tagetes erecta） seedlings.[Results] The application of leaf leachates of J.curcas in the soil significantly inhibited the shoot and root length of marigold compared to un-amended soils.The leaf leachates increased the O-2,H2O2,MDA and proline content in the roots of marigold seedlings.The effects increased with the ascending of leaf leachates concentration.In addition,superoxide dismutase（SOD） and guaiacol peroxidase（POD） were not remarkably affected by the leachates at lower concentrations,but at higher concentration,SOD activity was ascended.Similarly,the activities of CAT and APX were also significantly increased with the increase of leachates concentrations.[Conclusion] These results show that J.curcas can release the phytotoxic compound（s） into soil,which are inhibitory to certain test species by interfering with physiological process.
文摘In order to domesticate H. azurea （Halopegia azurea）, acclimatization of rhizome＇s cuttings and young shoots in farms was tested at Nkol Evodo village from February 2012 to June 2012. The best substrate for propagation was assessed： （0） wetland; （1） sand/wetland; （2） sawdust/wetland; （3） sand/sawdust/wetland. Young shoots＇ growth was observed in situ for 8 weeks. A significant difference （P 〈 0.05） was observed in the appearance of young shoots and leaves in nursery. The highest average number of young shoots and leaves （0.62 ± 0.09） was found in substrates 0 and 1, the lowest （0.31 ± 0.08） in substrate 3. Substrate 3 showed the lowest number of young leaves （0.41 ± 0.16） and substrate 2 the highest （0.97 ±0.24）. A significant difference in the mortality rate of cuttings （P 〈 0.05） was observed： 68.75% and 53.12% in substrates 2 and 3, respectively. On farm, new leaves and young shoots＇ appearance showed a highly significant difference. Plants growing in substrates 2 and 3 showed the highest number of leaves. New shoots developed only in plants growing in substrates 0 and 1. These results suggest that it is possible to domesticate H. azurea for leaves＇ production in quantity and quality, and open up better opportunities for its cultivation.
