جستجوی مقالات مرتبط با کلیدواژه « characterization » در نشریات گروه « اقتصاد کشاورزی »

Thirteen advanced potato genotypes developed by TCRC were characterized for 24 qualitative and 16 quantitative traits and analyzed for diversity by PCO, PCA, and Cluster analysis. Qualitative traits showed low variability (0.34), which Quantitative traits showed medium-high variation (0.67). The pooling of all traits showed a medium type index (0.51). The genotypes were grouped into four clusters. Cluster I had six genotypes, while cluster II and IV had only one. The highest inter-cluster distance was observed between clusters II and III and the lowest was between clusters III and IV. The highest intracluster distance was found in cluster I, whereas Cluster II (0.00) and cluster IV (0.00) showed the lowest. The highest inter-genotype distance was between genotypes 8.46 and 7.33 (33.79), and the lowest was between 7.86 and 7.48 (5.70). The genotypes of cluster I earned the highest mean values for foliage coverage, plant vigor and tuber numbers/hill. Cluster II produced the highest means for plant vigor, primary stem/hill, leaf length, leaf width, leaflet blade length, blade width, lateral leaflet blade length, width, tuber weight/hill, and tuber yield. The first three PCA counted for 91.75% of the total variation, whereas the first one accounted for 69.47%. From the scree plot, three principal sample components effectively summarized the total variance. Results of PCA showed the reduction of the 16 original variables to three independent linear combinations of PCA. The number of tubers/hill contributed maximum towards divergence.

Twenty-nine potato varieties released by Bangladesh Agricultural Research Institute (BARI) were characterized at Breeder Seed Production Centre (BSPC), Debigonj, Bangladesh in 2012-13 and 2013-14 based on the Potato Descriptor IBPGR. Quantification of variability for each character done by Shannon-Weaver Diversity Index was subjected to Principal Component Analysis (PCA), Principal Coordinate Analysis (PCO) and Cluster Analysis. The qualitative characters exhibited low variation while the quantitative characters showed high variation. The Pooled values showed medium variability (0.596). The genotypes were grouped into five clusters. Cluster II had thirteen genotypes, while cluster IV and V had two each. The highest inter-cluster distance was observed between II and IV, while the lowest was III and V. The highest intra-cluster distance was found in cluster I. The inter-genotype distance was the highest between BARI Alu-22 and BARI Alu-41, and the lowest was between BARI Alu-42 and BARI Alu-34. The varieties of cluster IV earned the highest mean value for days to 80% emergence, foliage coverage, plant vigor, primary stem/hill, secondary leaflet and primary leaflet pairs. First four principal components accounted for 93.35% of the total variation. From the scree plot, four sample principal components effectively summarized the total variance. Results of PCA showed a reduction of the sixteen original variables into four linear values. The first principal components (PC1) can be considered as plant height and leaf, indicated by high loadings for plant height at 60 days after planting (DAP) (0.983), leaf length (0.133) and leaf width (0.099).

Rapeseed (Brassica campestris L. var toria) is the main source of edible oil for Nepalese people. 54 rapeseed lines were collected from different hilly district of Nepal ranging from 987 m to 2550 m altitude. These lines were planted in augmented design for its traits characterization in Khumaltar 2013. Different traits of local rapeseed were characterized, and evaluated. NGRC 02778 performed better followed by SR-02 than local checks Morang-2, Chitwan Local and Unnati in terms of yield, days to maturity and pest infestation. Similarly, genotype SR-18 was late and SR-16 was earlier in terms of days to maturity. In conclusion, SR-02 was found better genotype based on different characteristics measured among all local rapeseeds planted in Khumaltar 2013. Thus SR-2 can be used as parents in crossing material for further breeding purposes and it can also be tested in further trial.