Original article | International Journal of Innovative Approaches in Agricultural Research 2020, Vol. 4(4) 396-406
Lóránt Szőke, Gabriella Enikő Kovács, László Radócz, Mária Takácsné Hájos, Béla Kovács & Brigitta Tóth
pp. 396 - 406 | DOI: https://doi.org/10.29329/ijiaar.2020.320.1
Published online: December 25, 2020 | Number of Views: 20 | Number of Download: 53
One of the most dangerous diseases of corn is Ustilago maydis DC. Corda, which damages the maize yield every year. It is difficult to protect against the corn smut infection because the efficiency of fungicide treatment is inadequate. The purpose of this research was to examine the effects of corn smut infection on some physiological and morphological parameters of maize (Zea mays L. cv. Armagnac). Furthermore, the aim of this research was to examine the possible compensation effects of gibberellin (GA3) and ethylene (as ethrel) separately, and in combination on the corn smut infection. The plants were grown in a greenhouse, they were infected and treated in the five leaf phenological phase with two ml of sporidium suspension (10,000 sporidium/ml), injected into the stem. At the same time, one ml of gibberellin, ethylene and the combination of the two hormones were injected. The relative chlorophyll content, stem diameter and plant height were measured in the fourth and fifth leaves of plants, 7, 11 and 14 days after the infection (DAI). The photosynthetic pigments were determined from the fourth leaf, and the rate of lipid peroxidation was measured from the fifth leaves, 14 DAI.
The corn smut infection significantly reduced the relative-chlorophyll content 14 DAI compared to the control. The gibberellin reduced the harmful effects of the pathogen. No significant difference was recorded in case of stem diameter. The infected plants were shorter than the control plants when treated with ethylene.
The effect of corn smut infection was more pronounced in the terms of photosynthetic pigments and the rate of lipid peroxidation. Ethylene treatment increased while gibberellin treatment reduced the impact of the infection.
In this research, the corn smut infection and hormone treatments had larger impact on measured physiological parameters than on morphological parameters.
Keywords: Ustilago maydis, corn, lipid-peroxidation, chlorophyll content, plant height, stem diameter
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