جستجوی مقالات مرتبط با کلیدواژه « Adaptation » در نشریات گروه « بیوتکنولوژی و ژنتیک گیاهی »

In order to determination of appropriate stability parameters, the flower yields of 35 Rosa damascena genotypes in eight regions of Iran (Kurdistan, Hamedan, Kerman, Fars, Khuzestan, Isfahan, Markazi, and Khorasan) were evaluated for two years (2007-2008) using randomized complete block design with three replications. Significant differences (P≤0.01) were observed for flower yield among genotypes (G), locations (L), environments (E), and also for genotype× location (GL) and genotype× environment (GE) interactions. The stable and adaptable genotypes with some static concepts of stability parameters such as environmental variance (S2) and regression coefficient (b ≈ 0) had low yield, but with environmental coefficient of variation (CVE) had high performance. The stable genotypes according to Eberhart and Russell model and the concept of stability dynamics (bi ≈ 1, ∑ Sdi2 ≈ 0, and high Ῡi) had moderate to high flower yields. According to the superiority index (P), high yielding genotypes were determined as compatible (stable in location). The stable genotypes with the lowest year by location (YL) variance had the lowest flowers yield. The flower yield was positively correlated with S2, b and MSY/L (p<0.01) and negatively correlated with superiority index (P) and CVE (p<0.01). Based on both flower yield and stability, it was found that genotypes of Yazd 2, Isfahan 5, Isfahan 8, Isfahan 4, and Khuzestan 1 had high flower yield, stability, and general adaptation over locations. The genotypes Isfahan 9 and Isfahan 7 had high flower yield, stability, and specific adaptation with semi-arid and arid areas and also the genotype of Isfahan7 had high flower yield, stability and specific adaptation with semi temperate and cold areas in Iran. It was concluded that a genotype can demonstrate both static and dynamic stability with a high flower yield at the same time. In addition, coefficient of variation (CV), statistics regression (b ≈ 1, Sd2≈ 0), and superiority index (P) suggested as desirable parameters to evaluate different aspects (static and dynamic) of flower yield in R. damascena.

 Hymenocrater yazdianus is one of the important medicinal and range plant. This plant belongs to Lamiaceae family that grows in arid land regions. In this research mass production of Hymenocrater plant via tissue culture technique was studied. Lateral and apical buds were used as a primary explant for cultivation. For sterilization, Mercuric chloride was used at 0.1% concentration for 2 minutes. After sterilization, explants were washed 3 times with sterilized water containing 0.1% Citric acid for browning prevention of theme. Then all explants transfer to MS medium without any plant growth regulators as an establishment stage. After 4 weeks, explant transported in MS medium containing 0, 0.5, 1, 1.5 mgl-1, Benzyl adenine (BA) and Indole-butyric acid (IBA) concentrations at 0, 0.01 and 0.1 mgl-1 in 12 treatments for proliferation. The results showed, highest shoot number were obtained when we used MS medium at a concentration (1 mgl-1BA and IBA 0.1 mg l-1) In this culture medium we obtained 5.5 shoots in each tube. For rooting stage, MS and LS culture media were studied. In these culture media IBA was used in 0.0, 0.05, 0.1, 1 and 2 mgl-1. The results indicated using MS medium supplemented to 2 mgl-1 95% of explants were rooted.  Finally rooted plantlets were adapted successfully in peat and perlite complex to ratios of 2:1 and in vitro culture plant successfully transferd to the field.