An evaluation of ninety cultivars of grapevine selected from vines in Grapvine Collection of Horticultural Research Center, Agricultural Faculty of Tehran University was carried out at the center. Vines were planted in a density of 2 meters between any two consecutive vines in row and 3 meter spacing between rows, using cordon trellising system. Vines were spur pruned. The experiment was conducted in a complete randomized block design with 3 replications, each replication consisting of one vine plot, two samples in each vine. Some quantitative and qualitative characters (bunch weight, bunch number per vine, bunch size, berry weight, berry number, berry size, seed number, seed weight per berry, total soluble solids, acid content and...) were evaluated.
The results of phenotypic correlation, multiple regression and path analysis for yield of vine, bunch and berry showed that bunch number per vine, bunch weight, berry number and berry weight characters have the greatest effect on vine yield. Some characters such as bunch size, berry weight, berry number and bunch length have the greatest effect on bunch yield. On the other hand, the traits of length, width and berry size, along with number of seeds per berry have a conspicuous effect on berry yield.
Key words: , , Path analysis, Yield.
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