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Articles by Suriyan Cha-um
Total Records ( 6 ) for Suriyan Cha-um
  Suriyan Cha-um , Sittiruk Roytakul , Thamakron Sathung , Atikhun Maijandang and Chalermpol Kirdmanee
  The aim of this research is to investigate on the osmolarity changes, sugar profiles, chlorophyll fluorescence and growth performances of indica rice cultured under exogenous glucose and abscisic acid (ABA). Osmolarity in the root tissues of rice was positively related to increase glucose concentration in the media, while ABA application does not affected. Endogenous soluble sugars, sucrose, glucose and fructose in rice seedlings were slightly increased when exposure to glucose and ABA. High osmolarity in glucose treated seedlings was negatively related to total chlorophyll concentration. Chlorophyll a, chlorophyll b and total carotenoid concentrations in the rice seedlings were significantly damaged by high glucose and ABA application in the media. The chlorophyll a, total chlorophyll and total carotenoid degradation in the leaf tissues was positively correlated to maximum quantum yield of PSII (Fv/Fm), quantum efficiency of photosystem II (ΦPSII) and non-photochemical quenching (NPQ), respectively. The low efficiency of light capture in photosystem II should be caused to low growth, in term of root length, plant height and dry matter. Induced water deficit or drought stress by exogenous glucose application and ABA treatment in this investigation would be further applied to drought tolerant screening in rice breeding program.
  Suriyan Cha-um , Kanyaratt Supaibulwattana and Chalermpol Kirdmanee
  Rice crop response to salt stress is well known to involve multifunction mechanisms, which is dramatically regulated by various environmental factors. To reduce the uncontrolled environmental signals, the phenotypic responses of rice crop to salt stress were investigated under an in vitro environmental engineering system. The chlorophyll a, chlorophyll b, carotenoid, flavonoid and anthocyanin concentrations of seedlings cultured under acidic pH and low Relative Humidity (RH) with salt-stress conditions were sharply reduced by the factors of 2.26, 2.04, 2.15, 1.60 and 1.49 folds, respectively when compared to those cultured under neutral pH and high RH without salt-stress conditions. Degradation on pigment concentrations of rice seedlings positively related to the net-photosynthetic rate reduction (r = 0.94), led to growth retardation i.e. leaf area, shoot height, fresh and dry weights. The environmental factors of in vitro culture system such as extreme pH and RH should exhibit their realistic phenotypic responses to salt-stress that further applied for salt-tolerant screening.
  Suriyan Cha-um , Nguyen Minh Tuan , Kongchay Phimmakong and Chalermpol Kirdmanee
  The aim of this investigation was to acclimatize the ginger (Zingiber officinale Rosc.) plantlets cultured photoautotrophically in vitro under different RH and CO2 concentrations and subsequent ex vitro adaptation. Plantlets acclimatized in vitro under medium or high RH (80±5 or 95±5% RH) with 1,000±100 μmol mol-1 (CO2-enrichment) conditions possessed significantly higher Relative Water Content (RWC) than those acclimatized in vitro under low RH (65±5% RH) with 450±100 μmol mol-1 (CO2 non-enrichment) conditions. The RWC of acclimated plantlets was positively related to maximum quantum yield of PSII photochemistry (Fv/Fm) (r = 0.77), quantum efficiency of PSII (ΦPSII) (r = 0.89) and stomatal conductance (G) (r = 0.99), while negatively related to transpiration rate (r = 0.98). Moreover, the total chlorophyll concentration was closely related to ΦPSII (r = 0.77), lead to increase net photosynthetic rate (NPR) (r = 0.87). As well as, the intracellular CO2 concentration (Ci) and WUE of acclimatized plantlet positively related to NPR (r = 0.96 and r = 0.85, respectively), resulting in growth promotion (r = 0.99), as defined by the parameters of leaf area, fresh weight, dry weight, root number and root length. Five days after transplantation, the WUE, G, Fv/Fm and ΦPSII of ginger plantlets acclimatized in vitro under high RH with CO2-enriched conditions were significantly higher than those acclimatized in vitro under low RH and without CO2 enrichment, while E and transpiration ratio (Tr) were significantly lower. The plantlets acclimatized under high RH with CO2-enrichment conditions showed the highest adaptive abilities and WUE, resulting in the highest survival percentage (90-100%) after transplantation to ex vitro.
  Suriyan Cha-um , Kanyaratt Supaibulwatana and Chalermpol Kirdmanee
  Physiological responses of crop species to salt-stress in conventional in vitro culture may be found some errors due to sucrose as a main carbon source, causing to erratic data. Seven-day-old in vitro seedlings were aseptically transferred to culture under photoautotrophic and photomixotrophic systems for 13 days, subsequently adjusted to 0 and 342 mM NaCl. The pigment degradation of seedlings grown in 342 mM NaCl was positively related to NPR reduction in both the photoautotrophic (r=0.84) and the photomixotrophic system (r=0.95). This resulted in low growth, as measured by leaf expansion, shoot height, root length, fresh weight and dry weight. Moreover, the NPR reduction of seedlings cultured with 342 mM NaCl was positively related to the low survival percentage for both the photoautotrophic (r=0.96) and the photomixotrophic system (r=0.98). Moreover, the phenotypic responses of photoautotrophic seedlings to salt-stress expressed a more realistic phenotype than the photomixotrophic system. Besides, the phenotypic expression of seedlings cultured under photoautotrophic system responded more sensitively to salt-stress than those photomixotrophic system. Therefore, study of the phenotypic responses of seedlings to salt-stress would make use of the photoautotrophic system. This system should be a novel process for phenotypic expression of in vitro to salt stress.
  Suriyan Cha-um , Nguyen Thi-Thanh Hien and Chalermpol Kirdmanee
  The aim of present study is to find-out the meristem size of sugarcane varieties related to disease-free with a high recovery percentage. In vitro plantlets of four sugarcane varieties, Khonkan1, K97-29, KPS94-13 and K84-200, were cultured on modified-MS media. Meristem-tips were excised under stereomicroscope in different sizes, 0.5, 1.0 and 1.5 mm and cultured on modified-MS media under darkness. The meristem tips (0.5-1.5 mm) in all varieties were eliminated from bacteria and fungi, except those tips of K97-29 in size 1.0 and 1.5 mm showed 1.65 and 2.5% bacteria contamination. Recovery percentages were positively related to meristem size of K97-29 (R2 = 0.60), KPS94-13 (R2 = 0.77) and K84-200 (R2 = 74) varieties, but Khonkan1 variety dose not correlated (R2 = 0.23). In the largest size, the recovery percentages of KPS94-13 and K84-200 varieties were higher than those of Khonkan1 and K97-29 varieties for 2 folds. It should be concluded that the sizes of sugarcane meristem tips and varieties would play a key role on the disease-free production.
  Suriyan Cha-um , Sittiruk Roytakul , Thamakron Sathung , Atikhun Maijandang , Suchada Tengsiriwattana and Chalermpol Kirdmanee
  The aim of this research is to investigate on the osmotic adjustment and pigment preservation by soluble sugar accumulation in salt stressed rice using exogenous glucose and abscisic acid (ABA) application, leading to plant growth and development. Soluble sugars including sucrose, glucose and fructose in the salt-stressed root tissues were continuously increased in the conditions of 111-222 mM glucose and 20-60 μ M ABA treatments and then drop in the extreme 333-444 mM glucose and 80 μ M ABA treatments. Osmolarity in the salt-stressed root tissues showed the similar pattern to the sugar responses and was negatively related to soluble sugar concentration (r = 0.91). Chlorophyll a, chlorophyll b and total carotenoid concentrations in the salt-stressed seedlings were significantly maintained by endogenous sugar osmotic adjustment. In addition to, the high osmolarity in salt-stressed seedlings was negatively related to total chlorophyll stabilization (r = 0.83). The total chlorophyll degradation in the salt-stressed leaf tissues was positively correlated with plant growth defined by shoot height (r = 0.81). Root length, root number and root cortex thickness of salt-stressed rice seedlings showed the highest at 222 mM glucose and 60 μ M ABA treatments for 146.1 cm, 17.3 and 1.3 μ m, respectively. An exogenous application of glucose and ABA in this investigation is an alternative way to acclimatize the rice crop before exposed to soil salinity and further applied for rice cultivation in salinity filed trial.
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