Shuting Zhang,Junjie Chen,Qilei Zhang,Xingyu Liu,Aiqi Wang,Wenjie Sun,Jundong Huang,Changlian Peng,Qianming Wang
Mikania, a well-accepted invasive plant in nature, has been difficult to be completely removed even based on chemical herbicides. Moreover, the employment of chemical herbicides will lead to hazardous results to health or environment. In this study, the whole-new carbon polymer quantum dots (CPDs) have been afforded in the light of Mikania as the carbon source. Moreover, sesame has been selected as a plant model and the effect of such kind of nanoscale fertilizer on its growth has been explored. Results support that CPDs at a concentration of 0–0.4 mg/mL possess a physiological response to the germination and no toxicity has been observed. Confocal images demonstrate that CPDs can spread through the roots of sesame seeds to the stems and leaves. The utilization of micrantha-derived carbon quantum dots with fluorescence characteristics in the growth of sesame will give rise to new ideas for waste-plant management and biological control, and strengthen the importance of nanomaterials in related fields.
Ma Huiyan,Chen Yu,Chen Jinhui,Zhang Yunqiu,Zhang Tian,He He
Mikania micrantha and Ipomoea cairica are two invasive plants widely distribute and seriously damage in Hainan island. In this study, the leaves extracts of two weeds were collected and determined for their allelopathic potentials on Chrysanthemum coronarium . The phytotoxicity bioassay showed that when the extract concentration was 50 and 100 mg/ml, the inhibited effects of M. micrantha on growth of C. coronarium were greater than by I. cairica . However, when the extract concertation at 400 mg/ml, the opposite inhibited effects were observed. We speculated this phenomenon was caused by different allelopathic compounds. Therefore, using gas chromatography–mass spectrometry, 19 and 23 compounds were identified respectively, benzoic acid and cinnamic acid were the main components in the two leaves extracts, which were selected to carry out the further bioassays. Subsequent bioassay results showed the effects of two allelochemicals on morphological index and chlorophyll content and POD activity were all negative to C. coronarium , whereas the content of MDA and activity of SOD, CAT represented adverse changes. Moreover, the inhibitions by cinnamic acid were generally greater than those by benzoic acid. Thus, the phenolic acids played the most crucial roles in the allelopathic effccts of M. micrantha and I. cairica leaves extracts.
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