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DocumentGermination characteristics and storage behavior of Codonopsis pilosula Nannf. seeds
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Codonopsis pilosula Nannf. is classified as an endangered species (VU) in Korea. Ex situ conservation through long-term storage of seeds is, in principle, possible for a significant proportion of plants. However, it is not known whether these seeds are orthodox; that is, if they can survive under long-term storage conditions (-20 °C, 40 % relative humidity (RH) or less) without being damaged. We determined the germination characteristics and storage behavior of C. pilosula. The seeds were collected from plants growing at the Baekdudaegan Arboretum on September 17, 2020. Immediately after collection, the equilibrium relative humidity (eRH) of the seeds was measured. To determine the germination characteristics of the seeds, a germination test was conducted at temperatures of 15, 20, and 25 °C (12/12 h) with 100 and 250 ppm GA3. To determine the storage behavior, their moisture content was measured under five conditions: 15 °C and RH at 15, 20, 30, 40, and 50 %, at 250 ppm GA3. Vitality was calculated as the ratio of the number of germinated seeds and the survived seeds of the unsprouted through the TZ test. Viability tests were conducted in the order of X-ray, germination test, and TZ test. The average germination percentage (GP) of untreated seeds was below 11 ± 3 %. The highest GP of seeds following GA3 treatment was 90 ± 0.70 %. The eRH was 45 % after collection. The initial seed viability percentage was 90.3 ± 2 %. The highest viability percentage (VP) was identified at 91 ± 0.25 % in equilibrium with 20 % (eRH) at 15 °C with a moisture content of 3.23 % Fresh weight. The results of our study on the behavior of C. pilosula seeds indicate that orthodox seeds did not reduce in viability even when dried in equilibrium with 20 % RH; thus, these seeds can be kept under long-term storage conditions. Keywords: Biodiversity conservation, Climate change, Agriculture ID: 3622450 -
ArticleImpacts of co-management approach in influencing cognitive behavior of stakeholders in conserving the Sundarbans mangrove forest
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.The Sundarbans – the single largest mangrove forest in the world is under significant pressure of more than 3.5 million people surrounding the forest who are either partially or completely dependent on the natural resources of the forest for their livelihoods. The management of this reserved forest was found ineffective for several decades mainly due to increased population pressure. It has been more than a decade since the government of Bangladesh have introduced co-management approach (CMA) which involved the local communities to the management functions of the forest. After the completion of several CMA-based projects, this research explored the impacts of CMA by influencing the cognitive behavior of different stakeholders which facilitated the conservation efforts of the Sundarbans. Factors affecting the changes in the local stakeholders’ behavior viz., literacy rate and alternative income generating sources, attitude, performance experience, observational learning, and emotional arousal were revealed in this qualitative study. It inquired how CMA influenced the behavioral changes of the local stakeholders by improving social and environmental awareness. This study also identified the problems and role of higher institutional bodies in changing the locals’ attitude towards the co-management functions. It also found the relationship among the components of CMA and the elements of cognitive behavior influencing the decision-making process of different stakeholders. The study examined whether this process moved forward or not to a sustainable solution for the conservation of the mangrove forest. The findings of the research are expected to help the policy makers to take various policy decisions for the improved and sustainable management of the Sundarbans mangrove forest. Moreover, the findings are also applicable as nature-based solutions for climate-change adaptation through changed attitudes and behaviors of local community people. Keywords: Co-management approach, cognitive behavior, conservation, Sundarbans, Bangladesh ID: 3487000 -
ArticleGrowth and physiological acclimation to shade in young plants of Adesmia bijuga Phil., critically endangered species in central Chile
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Adesmia bijuga Phil. is an endemic and endangered shrub species of central Chile. Its potential shade intolerance is one of the leading hypotheses for its vigor loss when the species grows beneath closed canopies. In this study we aimed to assess growth and physiological acclimation to shade in young of A. bijuga plants. A nursery experiment was established with three light levels based on the interception of photosynthetic active radiation (PAR) (TRT0: control at full sun, TRT60: 60% shaded, and TRT90: 90% shaded), and maintained for 71 days during the summer season. Growth and leaf morpho-physiological responses were evaluated at the beginning, at the middle, and at the end of the experiment. The shading treatment increased plant height (H) and live crown percentage (Lcrown) compared to the control treatment at full sun. However, light-saturated photosynthetic rate (Amax), dark respiration rate (Rd), and light compensation point (Gi) were higher in TRT60 than in the other treatments.No differences were found among treatments for the apparent quantum yield (α). At this stage of plant development, our results suggest high acclimation plasticity of A. bijuga to light levels; however, a semi-shade environment (i.e., TRT60) favored a better performance of the species. Keywords: Shade tolerance, photosynthesis, light acclimation, forest restoration. ID: 3624055
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