Comparison of FTIR Spectra between Huanglongbing (Citrus Greening) and Other Citrus Maladies

• Published in: Journal of agricultural and food chemistry Vol. 58; no. 10; pp. 6007 - 6010
• Main Authors: Hawkins, Samantha A, Park, Bosoon, Poole, Gavin H, Gottwald, Tim R, Windham, William R, Albano, Joseph, Lawrence, Kurt C
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 26.05.2010
• Subjects: Analytical Methods; Biological and medical sciences; Carbohydrates - analysis; Citrus - chemistry; Citrus paradisi; Food industries; Fruit and vegetable industries; Fundamental and applied biological sciences. Psychology; Plant Diseases - microbiology; Plant Diseases - virology; Plant Leaves - chemistry; Plant Viruses; Spectroscopy, Fourier Transform Infrared; Xanthomonas; Citrus greening; huanglongbing; chemometrics; HLB; FTIR spectroscopy; Fourier transformation; Fruit; Rutaceae; Greening; Citrus; Infrared spectrometry; Dicotyledones; Angiospermae; Spermatophyta; Chemometrics
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/jf904249f

Fourier transform infrared (FTIR) spectroscopy has the ability to quickly identify the presence of specific carbohydrates in plant materials. The presence of the disease huanglongbing (HLB) in the leaves of infected citrus plants has a distinctive spectrum that can be used to distinguish an infected plant from a healthy plant. However, many citrus diseases display similar visible symptoms and are of concern to citrus growers. In this study several citrus diseases (citrus leaf rugose virus, citrus tristeza virus, citrus psorosis virus, and Xanthomonas axonopodis) and nutrient deficiencies (iron, copper, zinc, manganese, and magnesium) were compared with HLB using FTIR spectroscopy to determine if the spectra alone can be used to identify plants that are infected with HLB instead of another disease. The results indicate that the spectra of some diseases and deficiencies more closely resemble those of apparently healthy plants and some share the carbohydrate transformation that has been seen in the spectra of HLB-infected plants.