Exogenous application of signaling compounds enhances rice allelopathic potential in rhizosphere soil
2013
Mahmood, K. (South China Agricultural Univ., Guangzhou (China). Inst. of Tropical and Subtropical Ecology) | Khan, M.B. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Agronomy) | Ijaz, M. (The Islamia Univ., Bahawalpur (Pakistan). Dept. of Agronomy) | Ullah, H. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Horticulture) | Mahmood, A. (University of Sargodha (Pakistan). Univ. Coll. of Agriculture) | Song, Y.Y. | Luo, S.M. | Zeng, R.S.
In this study, allelopathic induction in rhizosphere after exogenous application of signaling compounds methyl jasmonate and methyl salicylate was evaluated. Post applications of signaling compounds to rice seedlings imposed allelopathic affect on tester plant species barnyard grass (Echinocloa cress-galli L.) and lettuce (Lactuca sativa L.). Two rice cultivars with contrasting allelopathic abilities were evaluated through rhizosphere soil method, aqueous leaf and root leachates bioassays. Rhizosphere soil of high allelopathic rice cultivar (BR-41) reduced the shoot length by 35-38% and root length by 52-53% of lettuce seedlings after methyl jasmonate and methyl salicylate application, respectively, while lower allelopathic rice cultivar (Huanjingxian) wane down the lettuce shoot length (25 and 27%) and root length 31 and 36%, respectively. The aqueous leaf and root leachates of both rice cultivars also imposed inhibition on germination and seedling growth of barnyard grass after signaling compounds treatment. Transcriptome analyses of genes responsible for momilactone biosynthesis (OsCyC1) were also up regulated. The relative expression of OsCyC1 was higher over basal levels present in control plant leaves. OsPAL is another key gene involved in phenolic compound biosynthesis and found up regulated after signaling compounds treatments. The maximum up regulation of OsPAL after methyl jasmonate and methyl salicylate application was 10 and 12 times higher at 12 h, respectively as compared to control plants. Exogenous application of signaling compounds can induce allelopathic potential for effective weed control in crop plants.
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