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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Preliminary Study on the Transpiration Rate of Tropical Tree Species in Thailand) ผู้เขียน: นายปรีชา ธรรมานนท์, รองศาสตราจารย์ ,  Mamoru Kanzaki, นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์, Ladawan Atipanumpai สื่อสิ่งพิมพ์:pdf AbstractThe diffusive resistance and the transpiration rates of 35 species, both exotic and indigenous were measured at four study sites throughout Thailand. The diurnal changes of transpiration rate were observed from morning to evening. The diffusive resistance of most species temporally increased around noon. The transpiration rate fluctuated remarkably with the Photosynthetic Photon Flux Density (PPFD). The effect of leaf ages and the upper and the lower surfaces of leaf on the transpiration rates were discussed. Water consumption in stand level and the transpiration ratio were calculated for E. camaldulensis and A. mangium. E. camaldulensis showed higher water consumption but lower transpiration ratio based on stem biomass compared to A. mangium. |
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ที่มา:การประชุมวิชาการพฤกษศาสตร์แห่งประเทศไทย ครั้งที่ 3หัวเรื่อง:อัตราคายน้ำของผลมังคุดที่อยู่ภายในและภายนอกทรงพุ่ม |
 ผลงานตีพิมพ์ในวารสารวิชาการResponse and acclimatization of a CAM orchid, Dendrobium Sonia ‘Earsakul’ to drought, heat, and combined drought and heat stressผู้แต่ง:ธนาโชค ตติเจริญ, Shogo Matsumoto, Ms.Cattleya Chutteang, Assistant Professor , Mr.Kancharoen Srioon , Dr.Chanate Malumpong, Associate Professor , Dr.Supatida Abdullakasim, Associate Professor , วารสาร: 
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 Researcherดร. พัชรียา บุญกอแก้ว, รองศาสตราจารย์ที่ทำงาน:ภาควิชาพืชสวน คณะเกษตร สาขาที่สนใจ:Photosynthesis (การสังเคราะห์ด้วยแสง), Environmental Plant Physiology (สรีรวิทยาพืชและสิ่งแวดล้อม), Plant growth regulators in horticultural crops (สารควบคุมการเจริญเติบโตพืชในพืชสวน), Physiology of ornamental plants (สรีรวิทยาการผลิตไม้ดอกไม้ประดับ) Resume |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Physiological Responses of Four Eucalyptus camaldulensis Clones to Waterlogging in a Hydroponic System) ผู้เขียน:Prapapun Youngsukying, ดร.สุตเขตต์ นาคะเสถียร, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractWaterlogging has a detrimental effect on environmental stress in Eucalyptus camaldulensis (Dehn.), as does calcareous soil, while together they act synergistically to induce stress in the plants. In the western region of Thailand, both conditions are deleterious to the eucalypt plantation industry. These stresses can reduce the biomass and yield of eucalypts at all stages of growth. To assist the eucalypt breeding program, powerful tools to screen a population are needed. Leaf gas exchange parameters can be used to study the photosynthetic capacity of plants during flooding, except in some flood-tolerant plants that have developed adaptive mechanisms to better maintain photosynthetic capacity. In this study, a physiological method was developed and applied to four Eucalyptus camaldulensis (Dehn.) clones to screen for the effects of waterlogging on net photosynthesis, maximum quantum yield, chlorophyll content and biomass. Four two-month-old eucalypt clones (C1 and C2 were calcicole clones and C3 and C4 were calcifuge clones) were grown in half-strength Hoagland’s solution and subjected to waterlogging conditions for 16 days. Physiological parameters were monitored at days 0, 8 and 16 under a plant growth incubator. The net photosynthetic rate (Amax), stomatal conductance (gs) and transpiration rate (E) rapidly reduced in C2 and C4 after 16 days of waterlogging. The maximum quantum yield (Fv/Fm), chlorophyll content and biomass of the four clones decreased in all cultivars under waterlogging at day 16. From measured physiological parameters, C2 and C4 suffered more severe stress under waterlogging than C1 and C3. Overall, a difference between the control and treated plants could be observed at 16 days after treatment. The physiological parameters of gas exchange and the Fv/Fm ratio were proven to be suitable indicators of waterlogging-tolerant traits. |
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