ارزيابي عملكرد و پايداري عملكرد گل اكسشن‌هاي مختلف گل محمدي (Rosa damascena Mill.)

Evaluation of Flower Yield and Stability of Various Rosa damascena Mill. Accessions

Yield stability in Rosa damascena Mill was analyzed as a part of the National Project carried out by Research Institute of Forests and Rangelands of Iran. Thirty-five accessions of Damask rose (Rosa damascena Mill.) from various regions were evaluated for performance and stability of flower yield in region of different echological conditions for two years of 2007 and 2008 using a randomized complete block design of three replicatins. Significant differences (p<0.01) were observed for accessions, environments, locations, and as well for accessionx environment and accessionx location infractions. Accessionxenvironment and accession* location infractions were mainly crossover interactions, a large portion of which was accounted for by non-linear (unpredictable) components. Grand mean for flower yield was 2263.14kg/ha. The accessions of Isfahan9, Yazd2, West Azarbaijan1, Isfahan7 and Isfahan, with 3120.63, 2941.63, 2894.62, 2769.15 and 2716.92 kg/ha respectively produced the highest flower yield among the studied accessions. Kerman with an average flower yield of 3635.46 kg/ha produced the highest yield among the studied locations. In addition accessions from such arid zones as Yazd2 and Isfahan accessionsʹ group showed higher flower yields than those from moderate and cold zones. The accessions of Yazd2, Isfahan5, Isfahan8, Isfahan4 Khouzestan1, Ardabil1 Isfahan and Balouchestan1 were stable and Yazd2, Isfahan, Isfahan8, Isfahan4 Khouzestan1, Ardabil1 _ Isfahan6, Isfahan, Balouchestan1 and Isfahan10 were adaptable accessions for flower yield as based on the Eberhart and Russel method characteristics (bi or regression coefficient of yield over environmental index equal to unity, Sd,2 or variance due to deviation from regression equal to zero and mean of yield without significant difference with total mean of accessions or higher than that). The occurrence of some high flower yield and in the meantime stable accessions such as Yazd2 and Isfahan5 suggests that a genotype can demonestrate high flower yield and as well stability for yield simultaneously. Thus simultaneous selection for flower yield and stability by means of nonparametric methods in Damask rose is possible. In addition, taking into consideration the flower yield along with stability potential, it was observed that the accessions of Yazd2, Isfahan5, Isfahan8, Isfahan4 and Khouzestan1 as general stable and adaptable and so high in flower yield and Isfahan9 and West Azarbaijan1 as specific stable and compatible accessions for warm, arid and semi arid areas and also the accessions of Isfahan7 and Isfahan for semi temperate cold areas. These results can be employed in improved development of high performance cultivars as well as stable and adaptable ones for commercial production of Damask rose.