PR Enzyme Activities of Cercospora theae Causing Bird’s Eye Spot Disease in Tea Plants (Camellia sinensis (L.) O.kuntze)

Gnanamangai, Balasubramanian Mythili; Ponmurugan, P.; Yazhini, Rajendran; Pragadeesh, K. Sekar

doi:10.3923/ppj.2011.13.21

Cited by 12 publications

(12 citation statements)

References 22 publications

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“…; Gnanamangai et al. ). Accordingly, higher CHI and GLU activities were observed for the inoculated plants from cvs.…”

Section: Discussionmentioning

confidence: 98%

“…; Gnanamangai et al. ; Leite et al. ), the more pronounced increases in the activities of the defence enzymes, as well as increases in the concentrations of TSP and LTGA derivatives, greatly constrained target spot development.…”

Section: Discussionmentioning

confidence: 99%

“…For the Camellia sinensis – Cercospora theae interaction, only CHI activity increased during fungal infection (Gnanamangai et al. ). In the present study, it was found that the CHI and GLU activities showed a similar pattern during the course of C. cassiicola infection, regardless of the soybean cultivar.…”

Section: Discussionmentioning

confidence: 99%

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Defence‐Related Enzymes in Soybean Resistance to Target Spot

Fortunato

Debona

Bernardeli

et al. 2015

Journal of Phytopathology

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Target spot, caused by the fungus Corynespora cassiicola, has become a serious foliar disease in soybean production in the Brazilian Cerrado. Information in the literature regarding the biochemical defence responses of soybean to C. cassiicola infection is rare. Therefore, the objective of this study was to determine the biochemical features associated with soybean resistance to target spot. The activities of chitinases (CHI), b-1-3-glucanases (GLU), phenylalanine ammonia-lyases (PAL), peroxidases (POX), polyphenol oxidases (PPO) and lipoxygenases (LOX), as well as the concentrations of total soluble phenolics (TSP) and lignin-thioglycolic acid (LTGA) derivatives, were determined in soybean leaves from both a resistant (FUNDACEP 59) and a susceptible (TMG 132) cultivar. The target spot severity, number of lesions per cm 2 of leaflet and area under the disease progress curve were significantly lower for plants from cv. FUNDA-CEP 59 compared to plants from cv. TMG 132. The GLU, CHI, PAL, POX and PPO activities and the concentration of LTGA derivatives increased significantly, whereas LOX activity decreased significantly on the leaves infected by C. cassiicola. Inoculated plants from cv. FUNDACEP 59 showed a higher PPO activity and concentrations of TSP and LTGA derivatives at 4 and 6 days after inoculation compared to plants from cv. TMG 132. In conclusion, the results of this study demonstrated that the defence-related enzyme activities increased upon C. cassiicola infection, regardless of the basal level of resistance of the cultivar studied. The increases in PPO activity and concentrations of TSP and LTGA derivatives, but lower LOX activity, at early stages of C. cassiicola infection were highly associated with soybean resistance to target spot.

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“…; Gnanamangai et al. ). Accordingly, higher CHI and GLU activities were observed for the inoculated plants from cvs.…”

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

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Defence‐Related Enzymes in Soybean Resistance to Target Spot

Fortunato

Debona

Bernardeli

et al. 2015

Journal of Phytopathology

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“…In general, the secretion of lytic enzymes and toxins by Cercospora spp. in plant tissues results in the production of reactive oxygen species (ROS) (Daub 1982a,b;Daub and Ehrenshaft 2000;Gnanamangai et al 2011;Nascimento et al 2014), particularly superoxide (O 2 À ), hydrogen peroxide (H 2 O 2 ) and hydroxyl radical (OH • ) (Trachootham et al 2008). Because ROS are strong oxidizing agents, they can cause the oxidation of essential macromolecules such as membrane lipids, pigments, nucleic acids and proteins (Apel and Hirt 2004), thereby leading to premature senescence (Baker and Orlandi 1995).…”

Section: Introductionmentioning

confidence: 99%

“…in plant tissues results in the production of reactive oxygen species (ROS) (Daub ,b; Daub and Ehrenshaft ; Gnanamangai et al. ; Nascimento et al. ), particularly superoxide (O 2 − ), hydrogen peroxide (H 2 O 2 ) and hydroxyl radical (OH • ) (Trachootham et al.…”

Section: Introductionmentioning

confidence: 99%

Silicon‐Induced Changes in the Antioxidant System Reduce Soybean Resistance to Frogeye Leaf Spot

Nascimento

Debona

Silveira

et al. 2016

Journal of Phytopathology

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Frogeye leaf spot (FLS), caused by the fungus Cercospora sojina, is one of the most important soybean diseases and can cause great yield losses. Several studies have demonstrated that silicon (Si) enhances the plant antioxidant system, especially when they are subjected to stresses. Thus, this study was designed to evaluate the effect of Si on soybean resistance to FLS, on the antioxidant system, on the concentration of reactive oxygen species and on cellular damage during the infection process of C. sojina. Plants from cultivars Bossier and Conquista, susceptible and resistant to FLS, respectively, were supplied with either 0 (−Si) or 2 mm (+Si) and non‐inoculated or inoculated with C. sojina. FLS severity was greater for Bossier than for Conquista, regardless of the Si supply, and it was increased by Si for both cultivars. The activities of the most antioxidant enzymes were lower in the +Si plants than in the −Si plants when they were not inoculated. Inoculated plants usually showed an increased enzyme activities and higher concentrations of ascorbate and reduced glutathione than did the non‐inoculated plants, regardless of Si supply. At advanced stages of fungal infection, the +Si‐inoculated plants from Bossier had higher activity of most antioxidant enzymes and higher concentrations of superoxide and malondialdehyde compared to the non‐inoculated plants as a result of an increased oxidative stress. The results from this study provide the first evidence that Si reduces the basal activity of antioxidant enzymes in soybean leaves leading to an increase in host susceptibility to FLS.

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Stress Physiology

Mondal

2014

Breeding and Biotechnology of Tea and Its Wild Species

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PR Enzyme Activities of Cercospora theae Causing Bird’s Eye Spot Disease in Tea Plants (Camellia sinensis (L.) O.kuntze)

Cited by 12 publications

References 22 publications

Defence‐Related Enzymes in Soybean Resistance to Target Spot

Defence‐Related Enzymes in Soybean Resistance to Target Spot

Silicon‐Induced Changes in the Antioxidant System Reduce Soybean Resistance to Frogeye Leaf Spot

Stress Physiology

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