The seedling growth and the content of endogenous phytohormones in wheat seedlings were estimated 3, 6, and 9 days after infection with the bunt pathogen (Tilletia caries) (DC.)TUL. The infection of a pathogen-susceptible species Triticum aestivum L. and a resistant species T. timopheevii Zhuk. resulted, respectively, in an increase and a decrease in the seedling growth and the IAA content as compared to the control. The cytokinin content increased in both species, and the increase in T. timopheevii was more rapid. The pathogen-induced increase in auxin content is suggested to enhance fungal invasion of plants. In the susceptible species, a high ABA concentration was retained for a longer period of time and could act as a factor of virulence. At the same time, in the resistant species, an increase in ABA content was transient and seems to trigger plant defense mechanisms.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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