Scientia Agricultura Sinica ›› 2007, Vol. 40 ›› Issue (1): 78-83 .doi: 10.3864/j.issn.0578-1752.at-2005-6283

• PLANT PROTECTION • Previous Articles     Next Articles

Chlorophyll fluorescence sensing to detect stripe rust in wheat (Triticum aestivum L.) fields based on Fraunhofer lines

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  1. 国家农业信息化工程技术研究中心
  • Received:2005-10-25 Revised:1900-01-01 Online:2007-01-10 Published:2007-01-10

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Abstract: Wheat stripe rust detection based on chlorophyll fluorescence (CF) sensing is large area and real time, with more advantages of saving time and labor compared to traditional investigation. Diseases with different levels were induced by artificial inoculation, and then canopy radiances were measured using the ASD field spectrometer. The amount of CF was quantified at 688 nm and 761 nm, where the solar spectrum was attenuated (Fraunhofer lines). The results showed that CF at 688 nm was positively correlated with the disease index (DI) whereas CF at 761 nm was negatively correlated with DI. Ratios of CF at 688 to that at 761 nm, which found to be a suitable indicator of stress events in plants, were positively related to DI. Besides, measurements of several photosynthetic parameters (SPAD, Fv/Fm, Yield and Pn) have been shown to decrease as leaf sev

Key words: Chlorophyll fluorescence, Fraunhofer line principle, Stripe rust, Wheat, Passive remote sensing

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