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Hassani D.,Iranian Seed and Plant Improvement Institute | Soleimani A.,Iranian Seed and Plant Improvement Institute | Mozaffari M.R.,Kerman Agricultural and Natural Resource Research Center | Fahadan A.,Korasan Razavi Agricultural and Natural Resource Research Center | And 2 more authors.
Acta Horticulturae | Year: 2013

Walnut is an important crop among nut tree species. In spite of it's high value, it didn't have the appropriate attention in the previous research activities in the world. One of the main problems in this species is the limited number of commercial cultivars bred up to now. On the other hand, research activities on walnut rootstocks are still more limited. The aim of this study was comparing the offspring of some selected walnut genotypes as rootstocks. The parents were selected based on vegetative vigor and morphological characteristics in Karaj, Kerman and Mashhad. The evaluation of offspring was done in 2006 and 2007. Germination percent, inter-node number, internode length in 2006 and plant height in 2006 and 2007 were recorded. The two years old rootstocks were grafted with 'Hartley' and Z63 selection scions in 2007, and the percent of graft take were recorded for each combination. The result showed that there was a difference in mean germination of the different region. Mean germination of the offspring of Karaj and Mashhad were 35% but Kerman with 23% showed the less germination. The mean plant height was not so different in the offspring of different regions in the first year, while the offspring of Mashhad showed to be more vigorous in the second year. The variation among the offspring of each region was considerable, so that the widest range in germination was observed among genotypes of Karaj ranging from 17 to 64.

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