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Effect of Submergence at the Tillering Stage on the Maximum Quantum Yield Efficiency and Leaf Gas Films of Thai Rice

Tepsuda Rungrat
Department of Agricultural Science, Faculty of Agriculture Natural Resources and Environment, Naresuan University, Phitsanulok, Thailand
Abstract—The maximum quantum yield efficiency of PSII and leaf gas film production after 10 days of complete submergence at the tillering stage was compared among six Thai rice varieties. The treatments included two growth conditions (normal growing condition as control and complete submergence). The control group was treated with the conventional growing method in plastic pots, while the complete submergence was artificially simulated and transferred into plastic tubs at 15 days after transplanting with 1-meter depth of water. Compared with the control group, the submerged group showed significant increases in plant height. The flood tolerance variety, Chonlasit, presented a small increase, but there was a non-significant difference in plant elongation after submergence compared with susceptible varieties, PSL2, PTT, RD51, RD61, and KDML105. Chonlasit showed the greatest percentage of plant survival with 91.67%, while RD61 showed the lowest with 72.55%. Leaf gas films of all six varieties were observed after 6 hrs of submergence. Chonlasit and PSL2 presented much volume of leaf gas films in comparison with other varieties. There was little change in the maximum quantum yield efficiency of PSII (Fv/Fm) of the flood tolerance variety, Chonlasit. In contrast, the Fv/Fm value of susceptible varieties decreased significantly.
 
Index Terms—near-isogenic line, physical property, chemical property, bacterial blight

Cite: Tepsuda Rungrat, "Effect of Submergence at the Tillering Stage on the Maximum Quantum Yield Efficiency and Leaf Gas Films of Thai Rice," Journal of Advanced Agricultural Technologies, Vol. 8, No. 1, pp. 13-16, June 2021. Doi: 10.18178/joaat.8.1.13-16

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