Articles
EFFECT OF SOIL SALINITY AND FUSARIUM SAMBUCINUM INFECTION ON DEVELOPMENT OF POTATOES CULTIVAR ‘ATLANTIC’
Article number
619_28
Pages
251 – 261
Language
English
Abstract
In the United States, potatoes are grown in many different areas, including soils with high levels of salinity.
Higher soil salinity causes stress to the plant which is evident by biochemical and physiological changes such as internal tuber browning.
In some instances further stress may be induced by infection with a pathogen, which could result in more complex symptoms.
Irrigation of the field can aggravate the effect of soil salinity and provide an environment beneficial for infection by certain pathogens such as Fusarium sambucinum. Internal tuber browning has been observed frequently in potatoes from fields with high soil salinity content and potentially infested with F. sambucinum. However, no information is available regarding the interaction between soil salinity and F. sambucinum infection.
In this study we examined the effects of varying levels of soil salinity, with and without infection of F. sambucinum, on development of tuber disorders.
We intended to recreate the environmental conditions responsible for tuber browning.
An outdoor experiment was carried out in the field in East Lansing, MI/USA. Potatoes, cv.
Atlantic, were planted in pots (57 L capacity) on June 28, 2001; half were inoculated with F. sambucinum prior to planting.
NaCl treatments (2.1 g/L, 4.25 g/L, 6.38 g/L, 8.5 g/L) were applied to the pots, the first forty-six days after planting, and four additional treatments were applied, each about 7 days apart.
Results indicate that high salinity and F. sambucinum infection caused tuber browning and an increase in proline content in the leaves.
Chlorogenic acid and polyphenol oxidase content were greater in tubers infected with F. sambucinum. All treatments resulted in a reduction in tuber weight, and the production of many smaller tubers.
Higher soil salinity causes stress to the plant which is evident by biochemical and physiological changes such as internal tuber browning.
In some instances further stress may be induced by infection with a pathogen, which could result in more complex symptoms.
Irrigation of the field can aggravate the effect of soil salinity and provide an environment beneficial for infection by certain pathogens such as Fusarium sambucinum. Internal tuber browning has been observed frequently in potatoes from fields with high soil salinity content and potentially infested with F. sambucinum. However, no information is available regarding the interaction between soil salinity and F. sambucinum infection.
In this study we examined the effects of varying levels of soil salinity, with and without infection of F. sambucinum, on development of tuber disorders.
We intended to recreate the environmental conditions responsible for tuber browning.
An outdoor experiment was carried out in the field in East Lansing, MI/USA. Potatoes, cv.
Atlantic, were planted in pots (57 L capacity) on June 28, 2001; half were inoculated with F. sambucinum prior to planting.
NaCl treatments (2.1 g/L, 4.25 g/L, 6.38 g/L, 8.5 g/L) were applied to the pots, the first forty-six days after planting, and four additional treatments were applied, each about 7 days apart.
Results indicate that high salinity and F. sambucinum infection caused tuber browning and an increase in proline content in the leaves.
Chlorogenic acid and polyphenol oxidase content were greater in tubers infected with F. sambucinum. All treatments resulted in a reduction in tuber weight, and the production of many smaller tubers.
Authors
S. Dzengeleski, A.B. da Rocha, W.W. Kirk, R. Hammerschmidt
Keywords
potato, dry rot, salt stress, NaCl treatment, internal tuber browning
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