In present study the genetic diversity in some tomato genotypes were investigated in two years at North-west of Iran where due to its geographical situation is one of the most favourable regions for tomato cultivation. Twenty five tomato genotypes were evaluated for yield and important morphological traits during 2006-2007. Experiment was conducted in a 5 lattice square design with 3 replications in each one of years. Data on morphological traits were collected from central row on individual plants basis on mean values of five plants of each genotype selected at random. Analysis of variance on the studied traits revealed significant differences among genotypes for all the characters except for fruit yield, total soluble solids, titratable acidity and number of tillers. Genotype year interaction was only significant for some of the characters including number of fruit per plant, titratable acidity and for fruit yield. Mean data revealed high range for most of studied traits. Maximum and minimum variability were observed for number of fruit per plant and pH respectively. Hierarchical cluster analysis allowed the assessment of similarity and clarified some of the relationships among tomato genotypes. UPGMA produced a dendrogram with four clusters. The first cluster included 64% of studied tomato genotypes. Results from the PCA indicated that more than 91% of the variability observed can be explained by the first seven components. Based on PCA, PC1 can be considered as representatives of fruit size, while properties that show high correlation with PC2 are the ones related to plant characteristics.
Abstract. In order to evaluate genetic variations of tomato genotypes, an experiment carried out in Kahriz station during two seasons in 2010-11. Experimental design was randomized complete blocks with three replications. Combined analysis of variance showed that for agronomic and quality related traits were significant differences. Selb-Jino, TO 2 , Early-Urbana, Carmina, Cal-J-N and Falat-Shof with more than 10.5 kg/m 2 had the highest fruit yield. With increasing fruit number per plant decreased fruit weight. Carmina had 170cm plant height and indeterminate growth. TO 4 , Chase, Selb-Jino and Carmina with more than 5.2% had the most total soluble solid. Cluster analysis classified genotypes in two groups. Flower inflorescence had the most significant regression coefficient (0.63) with fruit yield. Two first components explained 97% of total variations in principal components analysis. Correlation coefficients of fruit yield with fruit number at per plant (r=0.49 * ), number of flower per inflorescence (r=0.48 * ) were positive significant differences. With delaying fruit maturity decreased fruit number (r=-0.78**), increased fruit weight (r=0.80**) and pH (r=0.71**). Therefore, genotypes with more fruits had low pH (r=-0.75**). From the point of fruit shape Carmina, Nina, Selb-Jno and BSS282 were quite uniform. TO 4 and TO 2 had the most fruit color and Carmia, Falat-CH, Super-Srin-B, Shof, Falat-Y and Seb-Jino were the lowest values. Fruit firmness of cultivars was in four groups. Blossom-end rot in BSS282, Tima and TO 4 were less than others.
Assessment of adaptability and seed yield stability of selected quinoa (Chenopodium quinoa Willd.) genotypes in spring cropping systems in cold and temperate regions of Iran
ABSTRACT:To evaluate the lead tolerance of Populus euramericana (Dode) Guinier 561/41 and Populus nigra Linnaeus 63/135 clones in relation to photosynthetic efficiency, we measured physiological parameters of the two poplar clones exposed to Pb treatments. The pot experiment was established in a roofed place in a completely randomized design, with 5 Pb treatments (0, 0.5, 1, 1.5 and 2 g Pb·kg -1 ) per poplar clone. After 3 months, photosynthetic rate (A), transpiration rate (E), stomatal conductance, intercellular CO 2 concentration (C i ), leaf water potential were measured and water use efficiency (WUE) and mesophyll conductance (g m ) were computed. Results revealed that increasing Pb concentrations in soil reduced all physiological parameters of the two poplar clones, except C i . At all Pb treatments A and E, and at a concentration of 0.5 g Pb·kg -1 WUE and g m of P. euramericana plants were significantly higher than those of P. nigra plants. On the other hand, while a reduction in most physiological parameters of P. euramericana plants took place at a concentration of 1 g Pb·kg -1 and at higher concentrations, in P. nigra plants these reductions were from a concentration of 0.5 g Pb·kg -1 . With respect to physiological parameters, P. euramericana 561/41 clone was more tolerant of Pb than P. nigra 63/135 clone, therefore it can be considered as a suitable species in phytoremediation of lead-contaminated soils.
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