Effects of Gibberellic Acid on Fruit Growth and Fruit Development of Mangosteen (Garcinia mangostana Linn.)

Na Nakorn, S. and Intraratsamee, A. (2015). Effects of gibberellic acid on fruit growth and fruit development of mangosteen (Garcinia mangostana Linn.). International Journal of Agricultural Technology 11(2):335-340. Abstract The different concentrations of gibberelic acid (GA 3 ) applied by spraying on the 15-year-old magosteen trees during the full bloom and fruit setting stage. The study was conducted at the Chumphon Research and Training Centre, Faculty of Agriculture, Rajamangala University of Technology Srivijaya, Chumphon province from Mach, 2009 to Mach, 2010. The experiment was used the Completely Randomized Design (CRD) with 5 replications. The different GA 3 concentrations were evaluated: 0 25 50 75 and 100 ppm. The results of the study showed no significant differences among treatment means between GA 3 applied in different concentrations with control in parameter of fruit size (width and length) and fruit weight during fruit growth and fruit development at 15-45 days. After 60-120 days, the result showed differences among treatment means between GA 3 applied in different concentrations with control in parameter of fruit size (width and length) and fruit weight. Also, the different concentrations of GA 3 was affect of peel weight and aril weight. The total soluble solid (TSS) was recorded data that there is no significance found on the sweetness of fruit obtained from both treated and untreated trees

MtDNA diversity of the critically endangered Mekong giant catfish (Pangasianodon gigas Chevey, 1913) and closely related species : implications for conservation

Catfishes of the family Pangasiidae are an important group that contributes significantly to the fisheries of the Mekong River basin. In recent times the populations of several catfish species have declined, thought to be due to overfishing and habitat changes brought about by anthropogenic influences. The Mekong giant catfish Pangasianodon gigas Chevey, 1913 is listed as Critically Endangered on the IUCN Red List. In the present study, we assessed the level of genetic diversity of nine catfish species using sequences of the large subunit of mitochondrial DNA (16S rRNA). Approximately 570 base pairs (bp) were sequenced from 672 individuals of nine species. In all species studied, haplotype diversity and nucleotide diversity ranged from 0.118&plusmn;0.101 to 0.667&plusmn;0.141 and from 0.0002&plusmn;0.0003 to 0.0016&plusmn;0.0013, respectively. Four haplotypes were detected among 16 samples from natural populations of the critically endangered Mekong giant catfish. The results, in spite of the limited sample size for some species investigated, indicated that the level of genetic variation observed in wild populations of the Mekong giant catfish (haplotype diversity=0.350&plusmn;0.148, nucleotide diversity=0.0009&plusmn;0.0008) is commensurate with that of some other related species. This finding indicates that (1) wild populations of the Mekong giant catfish might be more robust than currently thought or (2) present wild populations of this species carry a genetic signature of the historically larger population(s). Findings from this study also have important implications for conservation of the Mekong giant catfish, especially in designing and implementing artificial breeding programme for restocking purposes.</div