abstract some agricultural fields of razevi and north khorasan provinces were sampled for identification and resistance to metalaxyl of pythium ultimum species isolates. isolation was done between years of 2007 to 2009. van der plaats- niterink key to species of pythium and specific its region of rdna were used for morphological and molecular identification respectively. micrometric characteris...

dna barcoding is a new term introduced in to scientific literatures by hebert and coworkers almost a decade ago. the concept of barcoding alone is well-known to the public: a series of black bars printed on many commercial products (universal product code), which are used to distinguish different products. advances made in molecular biology and molecular techniques late 20th century e.g. sequen...