 ผลงานตีพิมพ์ในวารสารวิชาการIs growth performance in rubber (Hevea brasiliensis) clones related to xylem hydraulic efficiency?ผู้แต่ง: Krissada Sangsing, Herve Cochard,  Dr.Poonpipope Kasemsap, Associate Professor , Dr.Sornprach Thanisawanyangkura, Associate Professor , Dr.Kumut Sangkhasila, Associate Professor , Eric Gohet, P Thaler, วารสาร: 
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ผลงานตีพิมพ์ในวารสารวิชาการXylem embolism and stomatal regulation in two rubber clones (Hevea brasiliensis Muell. Arg.)ผู้แต่ง:Krissada Sangsing, Dr.Poonpipope Kasemsap, Associate Professor, Dr.Sornprach Thanisawanyangkura, Associate Professor, Dr.Kumut Sangkhasila, Associate Professor, Eric Gohet, P Thaler, Herve Cochard, วารสาร: |
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Photosynthetic Capacity and Effect of Drought on Leaf Gas
Exchange in Two Rubber (Hevea brasiliensis) Clones) ผู้เขียน:Krissada Sangsing, Xavier Le Roux, ดร.พูนพิภพ เกษมทรัพย์, รองศาสตราจารย์, ดร.ศรปราชญ์ ธไนศวรรยางกูร, รองศาสตราจารย์, ดร.กุมุท สังขศิลา, รองศาสตราจารย์, Eric Gohet, Phillipe Thaler สื่อสิ่งพิมพ์:pdf AbstractPhotosynthetic capacity, water-use efficiency and nitrogen-use efficiency were compared between
two different rubber clones, PB 260 and PB 217. Plants were grown in 50 dm3 pots in a greenhouse at
Clermont-Ferrand, France under controlled condition. Net CO2 assimilation rate at 1800 ppm CO2
(A1800) and at 360 ppm CO2 (A360), maximum carboxylation rate (Vcmax), electron transport capacity
(Jmax) and nitrogen-use efficiency (A1800/Na, A360/Na, Vcmax/Na and Jmax/Na) of clone PB 260 were
significantly higher than those of clone PB 217. However, the dark respiration rate (Rd), the ratio of lightsaturated
rate of electron transport and maximum rate of carboxylation (Jmax/Vcmax), leaf mass per area
(Ma), leaf nitrogen content (Nm), leaf nitrogen per area (Na), water use efficiency (WUE), SPAD value
(SPAD) and chlorophyll fluorescence ratio (Fv/Fm) were non- significantly different between these
clones. Effects of drought on leaf gas exchange rates was also studied. Net CO2 assimilation rate (A),
stomatal conductance (gs) and transpiration rate (E) showed a declining curve as a function of increased
water stress. WUE was high under severe stress, due to a more rapid decrease of E than A. At 14 days after
stress, gs and E decreased by 80-85%, while A decreased by 60-70%. Drought also reduced leaf water
potential, which was possitively related to stomatal conductance. These results confirmed the potential
genotypic variability of some photosynthetic traits under non-water-limited condition and stomatal
behavior related with hydraulic properties during water stress in rubber trees. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Respiration Rate and a Two-component Model of Growth
and Maintenance Respiration in Leaves of Rubber
(Hevea brasiliensis Muell. Arg.)) ผู้เขียน:Krissada Sangsing, ดร.พูนพิภพ เกษมทรัพย์, รองศาสตราจารย์, ดร.ศรปราชญ์ ธไนศวรรยางกูร, รองศาสตราจารย์, Eric Gohet, Philippe Thaler สื่อสิ่งพิมพ์:pdf AbstractThe future information of leaf selection for studies on respiration rate and leaf greenness, and
position variations of different rubber clones was investigated. Respiration rate and greenness were nonsignificantly
different between leaf position (leaf No. 1, 2 and 3) and leaflet position (left, middle and
right), but they were significantly different among clones. During leaf expansion, respiration rate per unit
leaf area declined with leaf age, but the differences were not obviously detected among clones. Leaf
expansion rate was sigmoid shaped curves, and increased with leaf age. Relative growth rate on an area
basis (RGRarea) of leaf declined with age. At fully expanded leaf of PB 235, RRIM 600, PB 260 and GT
1 clones, the greatest leaf area was found in PB 235, and the least in GT 1. For crop growth model
development and environmental response studies, a two- component model of growth and maintenance
respiration was used in leaves of rubber. Growth respiration coefficients were non-significantly different
(ranging from 4.928 ? 105 to 5.678 ? 105 mmolCO2 m-2) among 4 rubber clones. While, the greatest
maintenance coefficients were in RRIM 600, PB 60, GT 1, the least was in PB 235. In particular, strong
positive correlation between respiration rate and RGRarea was found for all clones. Maintenance
respiration was weakly related with leaf temperature, but growth respiration was not significantly related
with leaf temperature. |
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