جستجوی مقالات مرتبط با کلیدواژه « plant pathology » در نشریات گروه « گیاهپزشکی »

Induced resistance is a type of defense system in plants that is activated by a biotic agent and allows plants to resist pathogens or parasites. Strong inducers are usually quite effective and can trigger a plant resistance reaction. These molecules, also called elicitors, can be inanimate or biotic in nature, challenging the plant and reacting to it, which must be done by producing antimicrobial compounds and / or creating mechanisms is related to plant defense. Induction of resistance in plants is strongly influenced by environmental conditions, especially light and temperature during the day and growing conditions. In general, induction of resistance in plants by using live or non-live stimuli or the use of plant cultivars incompatible with the patient, are among the strategies considered by researchers in the management of diseases and plant diseases. Induced resistance to change of grape varieties infected with phytoplasma disease has been observed on different cases. This method is one of the treatment strategies in the management of phytoplasma diseases and diseases caused by fastidious vascular bacteria.

Summary Two biotrophic plant parasitic fungi viz. Phyllactinia acaciae and Ravenelia sp. are newly reported from Iran on Acacia oerfota (Forssk.) Schweinf (Fabaceae). Both taxa are documented by describing morphological features and providing photomicrographs. This is the first report of leaf parasitic fungi on Acacia in Iran. Moreover, Ravenelia is a new genus for Iranian rust mycobiota. We also report P. acaciae as a new powdery mildew from Western Asia. Study of the following specimen of Acacia oerfota collected from southern Iran revealed that the specimen was infected by a rust fungus and powdery mildew at the same time: On Acacia oerfota, Southern Iran, Hormozgan province, Bandar-Abbas towards Minab, Chah-Esmaiel village, alt. 150 m, 23 April 2000, A. Ghanbari and M. Moghadam (IRAN17404F)

Oxalis triangularis A. St.-Hil. (Oxalidaceae) known as “False Shamrock”, is a perennial ornamental plant native to Brazil. The plant is used as indoor pot plant in Iran. In June 2018, rust-infected leaves were sampled from an indoor pot plant in University of Maragheh, located in Maragheh, East Azarbaijan. The following morphological features were observed on infected leaves:

Oxalis triangularis A. St.-Hil. (Oxalidaceae) known as “False Shamrock”, is a perennial ornamental plant native to Brazil. The plant is used as indoor pot plant in Iran. In June 2018, rust-infected leaves were sampled from an indoor pot plant in University of Maragheh, located in Maragheh, East Azarbaijan. The following morphological features were observed on infected leaves: * Corresponding author’s E-mail: [email protected] 1. Research Associate Prof., Department of Botany, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran 2. Instructor and Assistant Prof., of Department of Plant Protection, Faculty of Agriculture, University of Maragheh, Maragheh, Iran Spermogonia and aecia not seen. Uredinia round, 0.2-0.4 mm in diameter, in orbicular groups forming concentric circles up to 9 mm in diameter, soon naked, erumpent, powdery, yellowish white to orange-yellow, without paraphyses, urediniospores 16-23 × 13-19 µm, ellipsoid, globoid or obovoid, wall 0.5-1(1.5) µm thick, minutely and densely echinulate, colorless, germ pores obscure. Telia not seen, teliospores were sporadically present in uredinia, 21-28 × 15-18 µm, ellipsoid, oblong or broadly oblong, rounded or obtuse at apex, slightly constricted at septum, wall quite colorless, smooth, thin, 0.5-0.8 µm, pedicel colorless, as long as spores or shorter (Fig. 1).