Showing 3 results for Salahi Ardakani
Reihaneh Gholami Gavam Abad, Seyed Ebrahim Sadeghi, Hamid Yarmand, Vahid Reza Moniri, Ali Mohammadpour, Ali Zarnegar, Ali Reza Haghshenas, Mohammad Reza Zargaran, Fatemeh Piruzi, Abbas Salahi Ardakani, Stephen P. Cook,
Volume 1, Issue 2 (12-2015)
Abstract
From 2009 to 2012, 16 species of Curculionidae (Coleoptera) from the subfamily Lixinae were collected on 17 species of food plants in Iranian rangelands. Identified species belong to seven genera in the tribes Lixini and Cleonini. The host plants from which they were collected were in the families Asteraceae, Fabaceae, Apiaceae, Campanulaceae, Brassicaceae and Zygophyllaceae. Of the 16 species that we captured, two (Lixus subfarinosus Desbrochers, 1893 and Larinus remissus Faust, 1889) represent the first records from Iran. These new data also extend the known ranges of several species (Larinus fucatus Faust, 1894, Larinus grisescens Gyllenhal, 1835, Microlarinus rhinocylloides Hochhuth, 1847 and Bangasternus planifrons (Brulle, 1832) in Iran. The distribution of beetles and their associated host plants are presented and ecological notes on each species are provided.
Volume 16, Issue 3 (5-2014)
Abstract
Hop stunt viroid (HSVd) isolates have been reported as the causal agent of citrus cachexia in Mazandaran Province and recently shown to be associated with yellow corky vein disease of sweet orange and split bark disorder of sweet lime in the Fars Province, Iran. In the present work isolation and partial characterization of viroids from citrus trees affected by gummy stem blight is reported from Kohgiluyeh–Boyerahmad (KB) Province of Iran. Fifteen samples of citrus trees from Dehdasht area (KB Province) showing bark necrosis, gum exudation and die-back as well as seven citrus symptompless trees from the same area were tested for the prevalence of viroids, through Reverse Transcription Polymerase Chain Reaction (RT-PCR) followed by sequencing of PCR products. They were also tested for Citrus tristeza virus through Double-Antibody Sandwich Enzyme Linked Immunosorbent Assay (DAS-ELISA). Two variants of HSVd which differed from GenBank isolates in nucleotide sequence and two variants of Citrus Bent Leaf Viroid (CBLVd) were identified in any of the symptomatic samples. Moreover, a Citrus Exocortis Viroid (CEVd) was found only in symptomatic sweet lime. An HSVd isolate from KB (HSVd-bn1) was selected and used for comparison with a number of HSVd variants from Iran (Fars and Mazandaran Provinces) and the related accessions from GenBank. On the basis of nucleotide sequence and secondary structure analysis, HSVd-bn1 and HSVd-bn2 belong to non-cachexia variants of HSVd and have about 95% similarity to Citrus gummy bark viroid, a sub-species of HSVd. CTV was not detected in the diseased plants. It is yet to be determined whether bark necrosis of sweet lime and of sweet orange plants is caused solely by the associated viroid(s) or other factors are involved as well.
Volume 16, Issue 7 (Supplementary Issue - 2014)
Abstract
To understand the relationship between natural physicochemical properties of soil and abundance of citrus root nematode (Tylenchulus semipenetrans), a survey was conducted during 2009-2010 in some 37 citrus orchards, in Kohgilouyeh va Boyerahmad Province, Iran. Distribution of the citrus nematode was determined by collecting random samples from the soil and citrus plant roots, extracting and enumerating the number of second stage juveniles, males/100 g of soil and females/5 g of root. The relationships between nematode population, and the factors of: organic matter content, Nitrogen (N), Phosphorus (P), Potassium (K), organic carbon, Calcium Carbonate, soil texture, Electrical Conductivity (EC) and pH were determined. Increase in nematode population density was observed by increasing soil saturation percentage (up to 43%), and by an increase in soil silt, sand, P, K and organic carbon, but by an increase in soil salinity, Calcium Carbonate, total Nitrogen and the amount of clay in soil, the nematode population decreased. Maximum nematode population density was recorded in a loamy soil texture. The most suitable soil pH for nematode activity was found almost seven while either an increase or decrease in soil pH, resulted in a decrease in nematode population. The number of second stage juveniles ranged from 58 to 2,730/100 g of soil while females were present by 11 to 331 individuals/g of root respectively. About 62% of the studied orchards were infested with T. semipenetrans.
