Effects of Flash Flood on Growth and Some Physiological Changes in Thai Rice at Tillering Stage

Abstract

The objective of this study is to investigate the impact of flash flooding to the growth and some physiological parameters at tilling stage. The experimental design was conducted in 2 x 6 factorial in Completely Randomize Design (CRD). The first factor was growth conditions which was consist of control and submergence. The second factor was rice varieties including Chonlasit, Phitsanulok 2 (PSL2), Pathum Thani 1 (PT1), RD51, RD61 and KDML105. The results showed that flash flood condition had affected on growth and development to all rice varieties by increasing plant height and elongation, whereas decreased in leaf greenness (SPAD unit) in all varieties, and decrease in maximum quantum efficiency of PSII photochemistry (Fv/Fm) in Chonlasit, RD15 and KDML105 significantly after submerged for 10 days. Chonlasit and RD51 are grouped as high tolerance varieties, while PSL2, PT1 and RD61 were categories as tolerate variety. The KDML105 was moderate tolerance variety. The results presented here suggested that chlorophyll fluorescence measurement can be used as a technique to evaluate flash flood tolerance in Thai rice variety.