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He H.,Key Laboratory of Biopesticide and Chemical Biology | Wang H.,Fujian Agriculture and forestry University | Lin Z.,Fujian Agriculture and forestry University | Chen R.,Fujian Agriculture and forestry University | And 3 more authors.
Allelopathy Journal | Year: 2011

To further explore the practical application of allelochemicals in rice production, the mixture of five oxygenic terpenoids [(-) carveol, (+) carvone, (-) menthone, (-) carvyl acetate, and (+) cedrol] identified in previous study, was evaluated in green house for their herbicidal activity on paddy weeds. This terpenoid mixture effectively reduced the growth (aboveground dry weight) of most paddy weeds by 90.0% in 2007 and 83.3% in 2009, respectively, over control. However, the growth of two tested hybrid rice cultivars (Shan-You 63 and Te-You-Hang II) was enhanced after the terpenoid mixture treatment. This study suggested that allelochemicals (including terpenoids), could be used as novel component of integrated weed management in rice production. Source

Fang C.,Fujian Agriculture and forestry University | Fang C.,Key Laboratory of Biopesticide and Chemical Biology | Yu Y.,Fujian Agriculture and forestry University | Chen W.,Fujian Agriculture and forestry University | And 5 more authors.
Plant Growth Regulation | Year: 2015

Jasmonic acid (JA) and methyl jasmonate are important endogenous signal molecules that can induce plant resistance to biotic and abiotic stresses. Allene oxide cyclase (AOC) is a key enzyme in the biosynthesis of jasmonates. Here, in order to evaluate the correlation between AOC transcript level and the allelopathic potential of rice, gene expression of AOC was genetic operated in allelopathic rice PI312777 and non-allelopathic rice Lemont, using RNA interference (RNAi) and overexpression (OX) techniques respectively. An increase in endogenous JA was found in AOC-OX rice, and the transcript levels of phenylalanine ammonia-lyase, cinnamate-4-hydroxylase, hydroxylase, CoA-ligases, O-methyltransferases, and cinnamoyl alcohol dehydrogenases, which are involved in phenolic acid synthesis, were also up-regulated in AOC-OX transgenic rice when compared with those of the wild type. Higher accumulation of protocatechuic acid, p-hydroxy benzoic acid, ferulic acid, benzoic acid, 4-hydroxy-3-methoxybenzoicacid, and cinnamic acid content were found in the AOC-OX transgenic line. The increase of phenolic acids in the AOC-OX transgenic lines led to enhanced inhibitory rates on barnyardgrass, whereas the reverse was true in the AOC-RNAi transgenic line. The results suggest that AOC can regulate the synthesis of rice phenolic acids and thus allelopathic inhibition on barnyardgrass. © 2015 Springer Science+Business Media Dordrecht Source

Xue X.-F.,Nanjing Agricultural University | Luo J.,Key Laboratory of Biopesticide and Chemical Biology | Xu Y.,Key Laboratory of Biopesticide and Chemical Biology | Hong X.-Y.,Nanjing Agricultural University
Zootaxa | Year: 2011

A new mite species belonging to the Eriophyidae (Acari: Eriophyoidea) from Kunming, Yunnan Province, southwestern China, is described and illustrated. Calepitrimerus kunmingensis sp. nov. causes erineum on its host plant, Schefflera odorata (Blanco) Merr. & Rolfe (Araliaceae), commonly known as the umbrella tree. Copyright © 2011 Magnolia Press. Source

Li Z.,Key Laboratory of Biopesticide and Chemical Biology | Li Z.,Fuzhou University | Qi X.,Fuzhou University | Li Q.,Fuzhou University | And 6 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2010

Obsticals for recropping are especially severe in the production of Rehmannia glutinosa, a Chinese medicinal herb. It taks 8 to 10 years before one can replant a Rehmannia glutinosa to the same field where the crop had been grown. In this study, five different solvents were used to extract potential autotoxins from the soil samples taken from a major Rehmannia glutinosa production area in Jiao-zuo, Henan Province after harvesting the crop. Bioassy was conducted to test the inhibiton rate (IR) of the five soil extracts on Rehmannia glutinosa radicle growth. Soil extract that had the greatest IR was selected for a greenhouse growth study and various physiological and biochemical parameters were measured. Finally, HPLC analysis was used to compare soil extracts with root exudates, and ESI-MS analysis was used to identify the chemical compositions of the soil extracts. Bioassy results demonstrated that water and methanol extracted soil autotoxins had the greatest IR; by adding 0.5 g/mL concentration of soil extracts to a germination study, the IR to Rehmannia glutinosa radicle growth was 17% and 26% for water and methanol extracts, respectively, and the IR reached above 70% when the concentration was increased to 5.0 g/mL. Greenhouse study exhibited that methanol extracted soil autotoxins had resulted in (1) decreased root activities and chlorophyll contents, (2) decreased activities of SOD, CAT, and POD, (3) enhanced membranaceous peroxidation, and (4) decreased growth hormones contents. HPLC analysis showed very similar chromatograms between the methanol extracts and the root exudates. ESI-MS analysis detected six characteristic substances: vanillic acid, D-mannitol, 2[4′-hydroxyphenyl]- ethyl hexacosanoate, verbascoside, β-sitosterol, and daucosterol. Source

Wang H.B.,Fujian Agriculture and forestry University | He H.B.,Key Laboratory of Biopesticide and Chemical Biology | He H.B.,Fujian Agriculture and forestry University | Yang G.D.,Fujian Agriculture and forestry University | And 4 more authors.
Acta Physiologiae Plantarum | Year: 2010

This paper reports on a hydroponics experiment that was conducted to investigate the effect of inorganic arsenics on the seedlings of the rice cultivar Shanyou63. The seedlings were subjected to two treatments, i.e., As(III) and As(V). The results showed that the morphological traits of the seedlings were significantly altered after the arsenic treatments. Analysis of nitrogen, phosphorus, potassium, and arsenic contents of the roots and leaves of the seedlings indicated that the absorption of phosphorus and potassium was mainly affected by As(III), while that of nitrogen was mainly affected by As(V). The expression of 12 genes involved in the absorption and utilization of nitrogen, phosphorus, and potassium were all observed to be down-regulated after the arsenic treatments. As(V) significantly affected the absorption and utilization of nitrogen, while As(III) significantly affected those of phosphorus and potassium. The result obtained by realtime FQ-PCR regarding the difference in the gene expressions agreed with that of our hydroponics experiment. © Franciszek Górski Institute of Plant Physiology. Source

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