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Articles by Sobir
Total Records ( 2 ) for Sobir
  Marlina Mustafa , Muhamad Syukur , Surjono Hadi Sutjahjo and Sobir
  Background: The agri-food industry has prioritized varieties with good quality fruit of vegetables such as tomatoes. Tomato fruit cracking is a physiological disorder that occurs due to genetic and environmental factors and causes fruit damage and reduce fruit quality, resulting in great economic losses. Objective: The objective of this study was to identify genotypes resistant and susceptible, determine selection criteria for fruit cracking resistance, inheritance of tomato fruit cracking and determine the selection method to develop superior tomatoes that are reistant to tomato fruit cracking. Material and Methods: A randomized complete block design was used to select parental plants based on fruit cracking index and determine the selection criteria based on correlation analysis, path analysis and heritability. Resistant genotype and susceptible genotype used as parent in six generation with Mendel analysis were used to determine the inheritance of tomato fruit cracking. Results: Results showed that the resistance genotypes to fruit cracking are IPBT4, IPBT56, IPBT60, IPBT64, IPBT83 and IPBT85 and the susceptible genotype in IPBT3. The resistance genotypes can be used as a donor parent for superior genotypes and fruit cracking resistance. The number of locales and pericarp thickness can be used as selection criteria for fruit cracking resistance because these have a high direct influence on fruit cracking and high heritability. Inheritance of tomato fruit cracking controlled by two pairs of double resessive epistasis gene or complete dominance. Conclusion: The pedigree selection will be the best breeding method to develop good line bred varieties with fruit cracking resistance.
  Murni Indarwatmi , Dadang , Sobir and Endang Sri Ratna
  Background and Objective: The cocoa mealybug Exallomochlus hispidus (Morrison) is a quarantine pest on mangosteen. Gamma irradiation is a possible phytosanitary control treatment. This research investigated the lethal and sublethal gamma irradiation doses for controlling Exallomochlus hispidus (E. hispidus) and the impact of irradiation on mangosteen fruit quality. Methodology: Nymphs and adult females of E. hispidus were exposed to gamma irradiation (50-2000 Gy and a control) and newly emerged females were exposed to a sublethal dose of 50-400 Gy. Mangosteen fruit was irradiated at 250-1000 Gy. Reproductive development, longevity and fecundity of irradiated females were observed. The physical and chemical qualities of irradiated fruit were assessed. Results: The LD99 for the first, second and third instar nymphs and adults were 423.7, 1026.0, 1276.0 and 1934.5 Gy, respectively. Irradiation doses of 50-400 Gy on adult females resulted in significantly longer pre and post birth periods but shorter birth period. These doses also increased the longevity and decreased the fecundity, observed as 99.7% unhatched eggs and 0.3% undeveloped nymphs. The quality of mangosteen fruit did not effect by irradiation unless the red color retain and vitamin C content of fruit was significantly decreased. Conclusion: The result indicates that irradiation is an effective phytosanitary treatment to control E. hispidus on mangosteen. Irradiation doses of 250 Gy are recommended for phytosanitary treatment without degradation of fruit quality.
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