Biochemical changes in corn plants infected by the maize bushy stunt phytoplasma

Junqueira, Ana Carolina; Bedendo, Ivan Paulo; Pascholati, Sérgio Florentino

doi:10.1016/j.pmpp.2005.01.005

Cited by 65 publications

(51 citation statements)

References 16 publications

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“…Lepka et al (1999) reported that phytoplasma infection in tobacco plants led to a significant increase of starch in source leaves and a decrease in sink leaves and roots when compared with healthy plants. Accumulation of carbohydrates has been reported in coconut palms affected by lethal yellowing (Maust et al 2003) and in corn plants affected by maize bushy stunt (Junqueira et al 2004), but some variations depending on the virulence of the phytoplasma isolate and on the host/phytoplasma association, were also described (Lepka et al 1999). This is considered a secondary effect of infection and can be explained through an inhibition of phloem transport.…”

Section: Discussionmentioning

confidence: 99%

Effect of phytoplasma infection on metabolite content and antioxidant enzyme activity in lime (Citrus aurantifolia)

et al. 2011

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The objective of the present work was to study biochemical alterations in lime plants infected by the Candidatus Phytoplasma aurantifoliae. Changes in antioxidant activities, content of chlorophylls (Chl), carotenoids (Car), soluble proteins, sugars and auxin (IAA) in infected plant were investigated. The activities of polyphenol oxidase (PPO), peroxidase (POX) and superoxide dismutase (SOD) were observed to be greater in infected leaves than the healthy control. Also according to nondenaturing PAGE, in infected leaves all the antioxidative enzymes isoforms were stronger than that of the healthy control. These results suggest that antioxidant enzymes can be activated in response to infection by phytoplasma. The decrease in content of proteins, total soluble and reducing sugars in infected plants point out changes in host metabolism due to the phytoplasma infection. The reduction in chlorophylls and auxin content shows that the phytoplasma can interfere in photosynthesis and induces senescence in the leaf. In conclusion, this study provides new insights into the lime response to phytoplasma infection.

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Section: Discussionmentioning

confidence: 99%

Effect of phytoplasma infection on metabolite content and antioxidant enzyme activity in lime (Citrus aurantifolia)

et al. 2011

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“…At the time of sampling for biochemical analysis, plants were stunted with underdeveloped roots. Leaves had symptoms of sugar accumulation (Junqueira et al 2004). The reduced level of proteins in leaf lamina (Table 1) could be attributed to repression of photosynthetic genes in sugar accumulating leaves (Paul and Pellny 2003).…”

Section: ⎯⎯⎯⎯mentioning

confidence: 99%

Induction of sucrose synthase in the phloem of phytoplasma infected maize

Brzin¹,

Petrovič²,

Ravnikar³

et al. 2011

Biol. plant.

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In this study, we have analyzed the expression of the low oxygen inducible sucrose synthase isozyme SH1 (SUS-SH1) in the phloem of maize (Zea mays L.) infected with maize bushy stunt phytoplasma. Immunolocalization and Western blot analysis revealed several fold induction of SUS-SH1 in companion cells of phytoplasma inhabited phloem of leaf sheaths and stems. The results imply higher rates of sucrose metabolism and intensified hypoxia in the phloem.

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“…Furthermore, other secondary factors of the infection can occur where the pathogen causes the accumulation of reactive oxygen species (ROS) that cause inactivation/oxidation of pre-existing pigments in chloroplasts (Wu et al 1997;Alma´si et al 2000;Arias et al 2003). Some authors have described the chlorophyll decrease in Hordeum vulgare plants affected by Blumeria graminis (Akhkha et al 2003) and in two Zea mays hybrids affected by the Dalbulus maidis pathogen (Junqueira et al 2004).…”

Section: Photosynthesis and Photosynthetic Water Use Efficiencymentioning

confidence: 99%

Relationships between leaf pigments and photosynthesis in common bean plants infected by anthracnose

Lobato

Gonçalves‐Vidigal

Filho

et al. 2010

New Zealand Journal of Crop and Horticultural Science

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The objective of this study was to: first, evaluate the infection effects caused by Colletotrichum lindemuthianum pathogen (race 2047) on photosynthetic pigments and gas exchanges in Phaseolus vulgaris plants (cv. Mexico 222); and, second, determine infection effects on leaf pigments and their consequences on photosynthesis rate. A completely randomized design with a factorial scheme was used, combining two treatments (control and inoculated) and three evaluation periods (4th, 8th and 12th day). Carotenoid levels presented decreases of 28.3% and 35% during the 8th and 12th day after infection, when control and inoculated plants were compared. Correlation analysis demonstrated the direct relationship between carotenoids and photosynthesis rate (r 00.84). Total chlorophyll in infected plants had progressive reductions of 6.4%, 20.6% and 21.3% on the 4th, 8th and 12th day, respectively, when treated and untreated plants were compared. Total chlorophyll with photosynthesis (r 00.85) also revealed a significant and linear correlation. The photosynthetic rate in infected plants decreased by 22%, 49.9% and 77.3% on the 4th, 8th and 12th days after the inoculation, respectively. Anthracnose infection also induced negative effects concerning stomatal conductance, transpiration, photosynthesis and water use efficiency. Our results demonstrate that leaf pigment reduction as a result of pathogens was the main cause of lower gaseous exchanges in infected plants.

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Biochemical changes in corn plants infected by the maize bushy stunt phytoplasma

Cited by 65 publications

References 16 publications

Effect of phytoplasma infection on metabolite content and antioxidant enzyme activity in lime (Citrus aurantifolia)

Effect of phytoplasma infection on metabolite content and antioxidant enzyme activity in lime (Citrus aurantifolia)

Induction of sucrose synthase in the phloem of phytoplasma infected maize

Relationships between leaf pigments and photosynthesis in common bean plants infected by anthracnose

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