An experiment was carried out at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from March to July 2014. Plants were grown in the rain-protected polyethylene shelter or shed to avoid rain u...An experiment was carried out at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from March to July 2014. Plants were grown in the rain-protected polyethylene shelter or shed to avoid rain under natural conditions. The experiment was conducted on biochemical characters of aus rice varieties in various soil moisture levels in three rice genotypes as BRRI dhan55 (V<sub>1</sub>), BR6976-2B-15 (V<sub>2</sub>), and tolerant check Hashikalmi (V<sub>3</sub>), and seven water stress were imposed as treatments. Treatments were 0 days of water stress (control) irrigated continuously throughout the experimental period (T<sub>0</sub>). From twenty days onwards water stress was imposed for seven days when the age of the seedling was 20 days (T<sub>1</sub>), 35 days (T<sub>2</sub>), 55 days (T<sub>3</sub>), 75 days (T<sub>4</sub>), 95 days (T<sub>5</sub>), and 115 days (T<sub>6</sub>). Our findings suggest that the proline, starch, and sugar content were also found comparatively higher in BRRI dhan55 and Hashikalmi among the genotypes under water stress conditions. Under water stress conditions, proline was accumulated, sugar, and starch were decreased. The soluble sugar content was much lower under water stress conditions due to lower RWC, chlorophyll content, stomatal conductance, and higher leaf rolling. Leaf accumulates anthocyanins under drought conditions and the red color increased as the intensity of water stress increased.展开更多
文摘An experiment was carried out at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from March to July 2014. Plants were grown in the rain-protected polyethylene shelter or shed to avoid rain under natural conditions. The experiment was conducted on biochemical characters of aus rice varieties in various soil moisture levels in three rice genotypes as BRRI dhan55 (V<sub>1</sub>), BR6976-2B-15 (V<sub>2</sub>), and tolerant check Hashikalmi (V<sub>3</sub>), and seven water stress were imposed as treatments. Treatments were 0 days of water stress (control) irrigated continuously throughout the experimental period (T<sub>0</sub>). From twenty days onwards water stress was imposed for seven days when the age of the seedling was 20 days (T<sub>1</sub>), 35 days (T<sub>2</sub>), 55 days (T<sub>3</sub>), 75 days (T<sub>4</sub>), 95 days (T<sub>5</sub>), and 115 days (T<sub>6</sub>). Our findings suggest that the proline, starch, and sugar content were also found comparatively higher in BRRI dhan55 and Hashikalmi among the genotypes under water stress conditions. Under water stress conditions, proline was accumulated, sugar, and starch were decreased. The soluble sugar content was much lower under water stress conditions due to lower RWC, chlorophyll content, stomatal conductance, and higher leaf rolling. Leaf accumulates anthocyanins under drought conditions and the red color increased as the intensity of water stress increased.
