Experiments were conducted at Entomology division of Directorate of Rice research to study the qualitative and quantitative changes in biochemical constituents in the rice plant treated with different xenobiotics, viz...Experiments were conducted at Entomology division of Directorate of Rice research to study the qualitative and quantitative changes in biochemical constituents in the rice plant treated with different xenobiotics, viz. insecticides like deltamethrin, imidacloprid, herbicide like 2,4-Dichlorophenoxyacetic acid, fungicide like carbendazim, green manure Calotropis gigantea leaves, botanicals like Neem Seed Powder and fertilizer urea along with control plants of TN1, PTB33 and Swama varieties comprising of total 15 treatments. Application of butachlor, carbendazim, deltamethrin and excessive nitrogen fertilization resulted in increased population build up of brown plant hopper （BPH）. Significantly, lower honeydew excretion （13 mme area） in the BPH nymphs was observed on resistant PTB33 variety compared to susceptible TN1 and Swarna varieties （116 and 110 mm2 respectively）. In susceptible TN1 variety, the sucrose content was significantly higher （9.35 mg/g tissue） compared to BPH resistant PTB33 （5.32 mg/g tissue）. The BPH resistant PTB33 variety exhibited significantly lower free amino acid content （1.23 mg/g tissue） as compared to TN1 （2.51 mg/g）. The C/N ratio was comparatively high in the resistant PTB33 alone （4.32）, but was low in PTB33 applied with 2,4-D ＋ carbendazim （2.73）, 2,4-D ＋ imidacloprid ~ carbendazim （2.3）, excess urea fertilizer （2.18）. The total phenol contents measured in resistant PTB33 （7.5 mg/g dry wt）, susceptible TN1 （5.865 mg/g dry wt） and the popular variety Swarna （5.57 mg/g dry wt） were almost same and no statistical difference was observed. Further, treatment of these varieties with different xenobiotics and botanicals also did not significantly alter their total phenol content. However, the phenol content of the resistant PTB 33 alone and treated with xenobiotics was higher compared to the susceptible TN 1 and Swarna varieties alone and treated with xenobiotics. The plant biochemical constituents such as free amino acids, sucrose were lower in untreated resistant PTB33 compared to susceptible TN1, and PTB33 treated with urea and deltamethrin. The high feeding rate and population build up on the susceptible variety TN1 is positively correlated with high quantities of sucrose, free amino acids and lower quantities of phenols and low C/N ratio.展开更多
文摘Experiments were conducted at Entomology division of Directorate of Rice research to study the qualitative and quantitative changes in biochemical constituents in the rice plant treated with different xenobiotics, viz. insecticides like deltamethrin, imidacloprid, herbicide like 2,4-Dichlorophenoxyacetic acid, fungicide like carbendazim, green manure Calotropis gigantea leaves, botanicals like Neem Seed Powder and fertilizer urea along with control plants of TN1, PTB33 and Swama varieties comprising of total 15 treatments. Application of butachlor, carbendazim, deltamethrin and excessive nitrogen fertilization resulted in increased population build up of brown plant hopper （BPH）. Significantly, lower honeydew excretion （13 mme area） in the BPH nymphs was observed on resistant PTB33 variety compared to susceptible TN1 and Swarna varieties （116 and 110 mm2 respectively）. In susceptible TN1 variety, the sucrose content was significantly higher （9.35 mg/g tissue） compared to BPH resistant PTB33 （5.32 mg/g tissue）. The BPH resistant PTB33 variety exhibited significantly lower free amino acid content （1.23 mg/g tissue） as compared to TN1 （2.51 mg/g）. The C/N ratio was comparatively high in the resistant PTB33 alone （4.32）, but was low in PTB33 applied with 2,4-D ＋ carbendazim （2.73）, 2,4-D ＋ imidacloprid ~ carbendazim （2.3）, excess urea fertilizer （2.18）. The total phenol contents measured in resistant PTB33 （7.5 mg/g dry wt）, susceptible TN1 （5.865 mg/g dry wt） and the popular variety Swarna （5.57 mg/g dry wt） were almost same and no statistical difference was observed. Further, treatment of these varieties with different xenobiotics and botanicals also did not significantly alter their total phenol content. However, the phenol content of the resistant PTB 33 alone and treated with xenobiotics was higher compared to the susceptible TN 1 and Swarna varieties alone and treated with xenobiotics. The plant biochemical constituents such as free amino acids, sucrose were lower in untreated resistant PTB33 compared to susceptible TN1, and PTB33 treated with urea and deltamethrin. The high feeding rate and population build up on the susceptible variety TN1 is positively correlated with high quantities of sucrose, free amino acids and lower quantities of phenols and low C/N ratio.
