Scientia Agricultura Sinica ›› 2005, Vol. 38 ›› Issue (06): 1113-1119 .

• TILLAGE & CULTIVATION·PHYSIOLOGY & ECOLOGY • Previous Articles     Next Articles

Effects of 1,2,4-Trichlorobenzene and Naphthalene Stress on Photosynthetic Characteristics of Rice at Heading Period

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  1. 扬州大学农学院
  • Received:2005-01-17 Revised:1900-01-01 Online:2005-06-10 Published:2005-06-10

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Abstract: The effects of 1,2,4-trichlorobenzene (TCB) and naphthalene (NAP) on photosynthetic characteristics of rice leaves were studied. The results showed that chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), photochemical efficiency (Fv/Fm), quantum yield of PSII (ΦPSII), potential activity of PSII (Fv/Fo) and photochemical quenching (qP) and non-photochemical quenching (qN) decreased under TCB and NAP stress. The effects of TCB were more serious than that of NAP, while the sensitivity of Shanyou 63 was higher than that of Wuyunjing 7. Under low concentration of organic pollutants, stomatal limitation was a dominating factor for Pn decrease. Under high concentration of organic pollutants, the decrease of Pn was due mainly to stomatal limitation and the non-stomatal limitation. High concentration of pollutants suppressed the synthesis more strongly, and finally reduced the grain yield. Among all of the chlorophyll fluorescence kinetics of parameters, both Fv/Fo and qN are more sensitive to TCB and NAP than the other parameters. Therefore, both Fv/Fo and qN would be the sensitive reference indicator of harm of organic pollutants on rice.

Key words: 4-Trichlorobenzene, Naphthalene, Rice, Photosynthetic characteristics

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