TITLE

POLYSACCHARIDES FROM ALOE BARBADENSIS REDUCE THE SEVERITY OF BACTERIAL SPOT AND ACTIVATE DISEASE-RELATED PROTEINS IN TOMATO

AUTHOR(S)
Luiz, C.; Felipini, R. B.; Costa, M. E. B.; Di Piero, R. M.
PUB. DATE
July 2012
SOURCE
Journal of Plant Pathology;Jul2012, Vol. 94 Issue 2, p387
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Bacterial spot is an important disease of tomato that causes a reduction of the leaf area and affects plant yield. The objective of this study was to evaluate the effect of polysaccharides from aloe vera (Aloe barbadensis Miller) parenchyma (PAV) on the severity of bacterial spot and to detect the defense mechanisms activated by them. Tomato plants at the five true leaf stage were treated with PAV, and inoculated with Xanthomonas gardneri four days later. The effect of heating PAV suspension on its effectiveness for disease control was also evaluated. The ability of the polysaccharides to induce the synthesis of pathogenesis-related proteins in plants was determined spectrophotometrically. Finally, the antimicrobial effect of PAV on X. gardneri cultures was checked. PAV heated at 100°C for 30 min reduced bacterial spot severity by up to 85.1%, but control level was decreased when the PAV heating time was doubled. Concerning peroxidase, polyphenoloxidase, and glucanase activities in tomato plants treated with PAV, a significant increase of these enzymes was found, even before challenging plants with X. gardneri. Although PAV showed little direct effect on the bacteria it seems to constitute a good alternative for the control of bacterial spot of tomato through induced resistance.
ACCESSION #
86442671

 

Related Articles

  • The effect of plant extracts as seed treatments to control bacterial leaf spot of tomato in Tanzania. Mbega, Ernest; Mortensen, Carmen; Mabagala, Robert; Wulff, Ednar // Journal of General Plant Pathology;Jul2012, Vol. 78 Issue 4, p277 

    Bacterial leaf spot (BLS) caused by seed-borne xanthomonads is a serious disease of tomato ( Solanum lycopersicum L.), causing significant losses in both yield and quality. To identify more effective control measures, we evaluated crude extracts from 84 plant species in in vitro and in planta...

  • Garden Tomato Diseases. Thomson, Jill // Gardener for the Prairies;Spring2006, Vol. 12 Issue 1, p18 

    Presents information on several garden tomato diseases. Fungal diseases caused by Alternaria solani, Phytophthora infestans and Septoria lycopersici; Bacterial diseases; Non-infectious diseases such as blossom-end rot and catfacing.

  • Science into practice controlling tomato root-mat disease.  // Horticulture Week;11/20/2009, p26 

    The article discusses the effectiveness of HDC project PC 241, initiated as an alternative biological strategy to reduce tomato root-mat disease. It states that root-mat disease leads to massive over-production of roots which results to increased leaf growth that causes poor crop quality. It...

  • Survival of Salmonella Montevideo on Tomato Leaves and Mature Green Tomatoes. Rathinasabapathi, Bala // Journal of Food Protection;Oct2004, Vol. 67 Issue 10, p2277 

    Survival of Salmonella Montevideo on tomato leaf and mature green tomatoes was examined. When spiked on the surfaces of excised leaves from greenhouse tomato plants, Salmonella Montevideo survived poorly if the leaves were allowed to dry. After spot inoculation of 6.6 log CFU per leaflet and...

  • How to prevent tomato seedling diseases. Hausbeck, Mary // GMPRO - Greenhouse Management & Production;Dec2009, Vol. 29 Issue 12, p34 

    The article discusses the prevention of tomato seedling diseases in greenhouses. It cites the common bacterial diseases of tomato seedlings, including bacterial speck (Pseudomonas syringae pv. tomato), bacterial spot (Xanthomonas campestris pv. vesicatoria) and bacterial canker (Clavibacter...

  • A comparison of disease severity measurements using image analysis and visual estimates using a category scale for genetic analysis of resistance to bacterial spot in tomato. Sun, Huijun; Wei, Jingli; Zhang, Jieyun; Yang, Wencai // European Journal of Plant Pathology;May2014, Vol. 139 Issue 1, p125 

    Bacterial spot caused by several Xanthomonas spp. is an economically important disease of tomato ( Solanum lycopersicum L.). Host resistance to the disease is partially dominant or incomplete, which requires accurate assessment of disease severity for genetic studies of resistance. In the...

  • Halo-spot and external stem necrosis of tomato caused by Pseudomonas syringae in Sinaloa, Mexico. Félix-Gastélum, R.; Maldonado-Mendoza, I.; Espinoza-Mancillas, M.; Leyva-López, N.; Martínez-Valenzuela, C.; Martínez-Álvarez, J.; Herrera-Rodríguez, G. // Phytoparasitica;Sep2012, Vol. 40 Issue 4, p403 

    Pseudomonas syringae pv. tomato has been observed in the fields in Sinaloa causing typical symptoms of bacterial speck. During the 2004-2005 growing seasons atypical symptoms were observed in tomato varieties grown in Sinaloa, consisting of external necrosis of stems, petioles, peduncles and...

  • Blight Prevention.  // American Vegetable Grower;Jan2014, Vol. 62 Issue 1, p31 

    The article discusses ways of preventing blight in greenhouse tomatoes. It discusses ways of identifying bacterial diseases that can pose problems on tomato transplants, including bacterial canker, bacterial speck and bacterial spot. It also recommends ways of preventing bacteria from being...

  • Development and validation of a standard area diagram set to aid estimation of bacterial spot severity on tomato leaves. Duan, Junjie; Zhao, Baimei; Wang, Yuqing; Yang, Wencai // European Journal of Plant Pathology;Aug2015, Vol. 142 Issue 4, p665 

    A standard area diagram (SAD) set to aid assessment of bacterial spot (caused by Xanthomonas spp.) severity on tomato ( Solanum lycopersicum L.) leaves was prepared and evaluated for improving accuracy, precision and reliability of visual estimates. The proposed SAD set contains illustrations of...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics