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Variations in Seed Yield and Related Traits in Onion (Allium cepa L.) Germplasm Collections
Luitel Binod Prasad,Han JiWon,Kang Soohyun,Cho Myeong Cheoul,Choi Min-Seon 한국원예학회 2024 원예과학기술지 Vol.42 No.1
Knowledge of genetic variations is important for the development of efficient breeding programs in onion. The objective of this study was to evaluate seed yields and related traits in 80 onion germplasms, and to select the best accessions for breeding and seed production programs. Among the eleven traits studied, seed yield showed the highest variation (64.1%), followed by the number of scapes·plant-1 (42.8%). Among the 80 accessions evaluated, 90% bolted within the range of 131.0 to 160.0 days and 20% showed more than 50% sterile male plants. The number of scapes·plant-1 and the scape height showed a highly significant (p < 0.01) positive correlation with the seed yield. Based on the eleven traits, a cluster analysis classified 80 germplasms into four groups, clusters 1, 2, 3 and 4, which contained 22, 50, six and two accessions, respectively. Cluster 2 accessions produced a higher average seed yield (12.8 g·plant-1) than clusters 1, 3 and 4. Clusters 2 and 1 had the highest number of accessions (12 and 3, respectively) and consisted of more than 50% sterile male plants. A principal component analysis (PCA) revealed that the first five principal components (PCs) explained 75.82% of the total variation. Days to 50% flowering, seed yield, days to flowering initiation, seed size, and scape height accounted for 28.53% of the total variation in PC1, whereas the scape diameter, days to bolting, 1,000 seed weight, and days to flowering contributed to 19.94% in PC2. Thus, the phenotypic characterization of onion germplasms may provide the best insights to the breeders for the selection of potential accessions in cultivar development and seed production programs.
Luitel, Binod Prasad,Kim, Sang Gyu,Sung, Jung Sook,Hur, On-Sook,Yoon, Mun-Sup,Rhee, Ju-Hee,Baek, Hyung-Jin,Ryu, Kyoung-Yul,Ko, Ho-Cheol The Korean Society of Plant Pathology 2016 식물병연구 Vol.22 No.3
Powdery mildew (Podosphaera xanthii) causes severe damage to pumpkin crops grown in open fields and plastic house. Initially, we used ten accessions of pumpkin species; Cucurbita pepo (3), C. maxima (2), C. moschata (2), and C. argyrosperma (3) to study the disease progress in different stages of seedling development. Commercial pumpkin varieties were used as susceptible host for inoculum management and young seedlings were inoculated by dusting powdery mildew spores on the cotyledons, 1-true-leaf and 2-true-leaf seedling stages. Based on initial study, we further evaluated 218 pumpkinaccessions for their resistance to powdery mildew in different seedling stages under plastic house. Area under disease progress curve (AUDPC) and relative AUDPC (rAUDPC) was higher in cotyledonary and 1-true-leaf than 2-true-leaf stage. Seedlings at cotyledons and 1-true-leaf seedling stage displayed more susceptibility to powdery mildew. Based on evaluation of 2-true-leaf stage, IT 110859 and IT 278459 from C. pepo and C. argyrosperma identified as resistant (<0.2). Of the 228 pumpkin accessions, 21 (9.2%) pumpkin accessions consisting of C. pepo (2), C. maxima (5), C. moschata (13), and C. argyrosperma (1) exhibited intermediate resistance (<0.4) to powdery mildew and these accessions are useful to growers for its rational management.
Binod Prasad Luitel,강원희 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.2
The in vitro androgenic response of minipaprika F1 hybrid cv. Vine sweet (red, yellow, and orange form)was investigated using Dumas de Vaulx (CP) and Murashige and Skoog (MS) culture media to ascertain the effectiveness of androgenesis in haploid production. The frequency of callus and embryo formation varied in anther cultures of all minipaprika forms in both culture media. Anthers in both culture media responded to form the callus without regeneration in all minipaprika forms. The anthers of ‘Vine sweet-yellow’ produced 62.5% and 46.7% normal embryo in CP and MS medium, respectively. ‘Vine sweet-yellow’ produced almost four fold more normal-looking embryos than ‘Vine sweet-red’ in both culture media, and ‘Vine-sweet orange’ showed low androgenic response to anther culture. The anthers cultured in CP medium gave more normal embryo in all minipaprika forms as compared to MS medium. Among a total of 51 embryos transferred to growth regulator free MS medium for regeneration, 45plants were regenerated. Flow cytometry analysis revealed that 44.5%, 42.4%, and 33.3% plants were haploids, and 55.5%, 57.6%, and 66.7% plants were spontaneous diploids in red, yellow and orange forms, respectively. The chromosome number of haploid plant was 12 and that of spontaneous diploid was 24. Stomata characters and chloroplast count in the guard cell of leaf stomata were also found to be reliable and simple method to analyze the ploidy level of regenerated plants. The spontaneous diploids confirmed as doubled haploids (DHs) following the self-pollination. The obtained DH and haploid plants from anther culture would be the valuable breeding materials for heterosis breeding.
Binod Prasad Luitel,Prakash Babu Adhikari,윤철수,강원희 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.2
This study was carried out to investigate the yield and fruit quality of tomato (Lycopersicon esculentum Mill.)cultivars using different plant bed width and growing substrates in Hwacheon Farm, 2011. Transplants of tomato cultivars ‘Campari’, ‘Temptation’, ‘Annamay’, and ‘Adoration’ were planted at 20 cm, 40 cm, 60 cm, and 80 cm bed width and same cultivars were grown at cocopeat, rockwool and masato in early July, 2011 in a greenhouse. Planting bed size significantly affected the fruit number, marketable fruit number (%) and weight (g), and total yield (g) per plant. Plants grown at 60 cm bed width yielded the highest fruit number (22.4), marketable fruit number (56.0%), marketable fruit weight (356.8 g) and total yield (564.5 g) per plant. Bed width had no significant effect on fruit size and quality characters. Plants grown in cocopeat produced the highest marketable fruit number (56.2%) per plant and yielded the greatest (445.6g) marketable yield per plant. Plants grown in cocopeat substrate produced higher fruit number (5.2%) and total yield (0.7%) than that of rockwool substrate. Fruit size and fruit quality characters showed no significant differences within growing substrates. Hence, planting the tomato cultivars in single row at 60 cm bed width is better approach to optimize the production space in greenhouse and cocopeat is recommended as potential growing substrates for tomato cultivation to increase its yield and fruit quality characters. This study was carried out to investigate the yield and fruit quality of tomato (Lycopersicon esculentum Mill.)cultivars using different plant bed width and growing substrates in Hwacheon Farm, 2011. Transplants of tomato cultivars ‘Campari’, ‘Temptation’, ‘Annamay’, and ‘Adoration’ were planted at 20 cm, 40 cm, 60 cm, and 80 cm bed width and same cultivars were grown at cocopeat, rockwool and masato in early July, 2011 in a greenhouse. Planting bed size significantly affected the fruit number, marketable fruit number (%) and weight (g), and total yield (g) per plant. Plants grown at 60 cm bed width yielded the highest fruit number (22.4), marketable fruit number (56.0%), marketable fruit weight (356.8 g) and total yield (564.5 g) per plant. Bed width had no significant effect on fruit size and quality characters. Plants grown in cocopeat produced the highest marketable fruit number (56.2%) per plant and yielded the greatest (445.6g) marketable yield per plant. Plants grown in cocopeat substrate produced higher fruit number (5.2%) and total yield (0.7%) than that of rockwool substrate. Fruit size and fruit quality characters showed no significant differences within growing substrates. Hence, planting the tomato cultivars in single row at 60 cm bed width is better approach to optimize the production space in greenhouse and cocopeat is recommended as potential growing substrates for tomato cultivation to increase its yield and fruit quality characters.
Genetic Variability and Traits Relationship Studies of WorldVeg Tomato Genotypes in Nepal
Binod Prasad Luitel,Dipendra Ghimire,Surendra Lal Shrestha,정효봉,양은영,조명철 한국국제농업개발학회 2023 韓國國際農業開發學會誌 Vol.35 No.3
This study was conducted to assess the genetic variability and correlation of phenotypic characteristics in 12 tomato (Solanum lycopersicum L.) genotypes including 11 WorldVeg and one commercial variety (Pusa Ruby) in Terai (plain) region of Nepal in 2021–2022. This experiment was laid out in a randomized complete block design with three replications. The phenotypic traits, including days to 50% flowering, plant vigor and height, fruit number/plant, fruit yield, fruit weight and diameter, fruit firmness and fruit pericarp thickness, and total soluble solids (TSS) content of the fruits, were studied. Analysis of variance revealed significant differences among the genotypes for all the traits except for plant vigor. The genotype of AVTO1705 resulted the highest fruit yield (2.9 kg/plant) than Pusa Ruby, a commercial check (0.5 kg/plant). The phenotypic coefficient of variation (PCV) was higher than the genotypic coefficient of variation (GCV) for all the traits and PCV values were maximum for the number of fruits, fruit yield, and fruit weight. High PCV, GCV, and genetic advance (GA) were observed for yield, fruit weight, and plant height, respectively, indicating the additive gene effect. High heritability for fruit yield/plant and plant height inferred the phenotypic selection for their genetic improvement. Fruit yield was significantly (P<0.05) positively correlated with the fruit number and fruit weight, and direct selection of these traits are reliable for yield improvement in tomato.