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Articles by Thamakron Sathung
Total Records ( 2 ) for Thamakron Sathung
  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 , 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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