State Key Laboratory of Soil Erosion and Dry Land Farming, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Northwest Sci-Tech University of Agriculture and Forestry, Yangling, 712100, Shaanxi, China.
*Correspondence author: E-Mail: mayongqing@ms.iswc.ac.cn
1College of Environmental Science, Anhui Normal University, Wuhu- 241000, China.
Generally, allelopathic potential in plants is determined by synergic interactions between the environmental and genetic factors. In wheat stubbles allelopathy, decomposition time and allelochemicals concentration play major role in regulating the allelopathic effects of wheat stubbles. Based on the wheat – potato rotation in China, allelopathic effects of aqueous extracts of four wheat accessions stubbles (No 22 Xiaoyan > No 131 Changwu > No 66 Yumai > No 3 Fengchan) from the Loess plateau of China were determined on the growth of transgenic potato. We found that sawtooth effect occurred due to allelopathic heterogeneity on the temporal and spatial scale. From Logistic regression and Markov model, it was observed that allelopathy of wheat stubbles influenced the roots and shoots growth of acceptor potato plants. The allelopathic potential lasted for 5–9 years. The allelopathy of wheat genotypes stubbles declined in order: No 22 Xiaoyan > No 131 Changwu > No 66 Yumai > No 3 Fengchan. Thus Markov model is effective in simulating the variability in allelopathic activity of wheat stubbles, which may help in weed control and sustainable agriculture.
Allelopathic expression, Loess Plateau of China, Markov model, sawtooth effect, stubbles, wheat
