Related items
Showing items related by metadata.
-
DocumentPatula pine (Pinus patula) cones opening under different treatments for rapid seed extraction in Londiani, Kenya
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Seed extraction from pines is challenging to the forestry sector globally. This is usually contributed by the pine cone anatomy that opens through a function of temperature and humidity which varies widely in the pine growing regions of the world and the Pinus species as observed in previous works done on Pinus roxburghii, Pinus halepensis, Pinus wallichiana, Pinus pinaster, Pinus radiata, and Pinus sylvestris. This study sought to reduce the extraction time and improve the extraction efficiency of Pinus patula seed in Kenya. The experimental design used was two factorial design with replicates of twenty cones randomly picked per treatment. Data analysis was analyzed through ANOVA with a Pvalue of 0.05. We present evidence that soaking does not influence the opening of cones and seed yield for the optimum temperature which the study determined to be 65°C. We also present evidence that, for rapid seed extraction, the temperature 65°C with an exposure period of between 4 and 24 h is significantly effective. This study presents a new understanding of rapid seed extraction, which contributes to one of the Kenya Forestry Research Institute’s strategic objectives of generating technologies for enhanced production of superior germplasm for priority tree species. Keyword: Research ID: 3469689 -
DocumentThe genomic selection of Korean red pine (Pinus densiflora)
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.The breeding of forest tree requires a much longer and more expensive effort than the breeding of other plants. Especially, one breeding cycle for Korean red pine takes 40-50 years in conventional breeding. To reduce the period of breeding cycle of Korean red pine, genomic selection (GS), where analysis is based on the all effects of quantitative trait loci (QTLs) using molecular markers of high-density, was attempted using individual data of four half-sib populations. The genotypic and phenotypic data of an individual were obtained from 50K SNP chip and 3D LiDAR scanner, respectively. For genomic selection related to four growth traits, the predictive ability of seven genomic prediction models was evaluated within- and between-regional approach. At first, the number of markers (2K, 6K, 10K and 16K) was tested and it was found that predictive abilities of genomic prediction models showed similar patterns with 6K and more markers. In addition, the predictive abilities of genomic prediction with 6K markers and three-fold cross-validation within region were estimated as 0.07~0.38 in height, 0.06~0.29 in DBH, 0.02~0.27 in straightness, and 0.06~0.25 in volume. Most of the genomic prediction results were higher than the results of A-BLUP based on the pedigree. Subsequently, when genomic prediction between regions was performed by using five regions as training population and a region as validation population, the predictive abilities were lower than that of within-region predictions. These results indicated that it is possible to improve Korean red pine for growth trait through genomic selection within region, but more experiment will be needed for between-region prediction. This study was the first trial of genomic selection for Korean forest tree, and suggested the possibility of its application to Korean red pine breeding. Keywords: Research ID: 3619084 -
ArticleImpact of Leptoglossus occidentalis on Pinus pinea cone to pine nut yield in Chile
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Stone pine nuts are highly appreciated and increasingly in demand. However, pine nut yield expressed as percentage of nut weight over cone weight, has decreased (from 4% to 2% or even less) in the European producer countries, due to the attack of the insect Leptoglossus occidentalis, which produces an increase in the presence of empty (up to 50%) and damaged seeds. The species shows a good adaptation in Chile, with over 2,000 hectares of new plantations. L. occidentalis here was first detected in 2017, with increasing captures in the last years. The objective of this study was to assess fruit traits and pine nut yield before and after the arrival of the insect, and to quantify its damages (types I (endosperm/embryo damage), II (endosperm elimination) and III (empty seeds)). Seven plantations were monitored in 2018 and 2019 and compared to data from previous years (2010/15). Cone size, seed number per cone, seed and pine nut size (length and diameter) and weight were measured at each plantation and year and pine nut yield was determined. Results showed average pine nut yield of 4% without decreases along time. In a hotspot site for the insect, a significant decrease in cone weight, seed weight and pine nuts per cone was quantified. A significant increase in damages type I and II was found in all sites after 2017. Consequently, the need of monitoring the advance of the insect in the country and its effects on stone pine cropping is relevant. Biological or chemical control will be required for adequate orchard management. Keywords: kernel yield, cone health, stone pine, insect attack ID: 3483547
Users also downloaded
Showing related downloaded files
No results found.