A study was conducted to screen out thelow-temperature tolerant Boro rice seedlings from November 2012 to January 2013for facing the upcoming rice production challenge in Northwest Bangladesh. Theexperimental time was characterized by a prevailing low environmentaltemperature of below 15°C. Five rice cultivars (V1: BR-2; V2: BR-16;V3: Pariza;V4: Minicate; V5: BRRIdhan 50)were selected for the study. The leaf proline, chlorophyll content and totalcarotenoid content were investigated. The V2 (BR-16) seedling synthesized thehigher leaf proline (1.228 g·g-1) at a low temperature than those of other tested cultivars. Again, thehighest amount of chlorophyll-a (3.957 g·g-1), chlorophyll-b (2.118 g·g-1), chlorophyll-a/b ratio (3.6754 mg·g-1) and total chlorophyll (5.051 g·g-1) was measured in V2 (BR-16). The maximum total carotenoid (1.213 g·g-1) was also observed in V2. In this experiment, the V2 (BR-16) showedcomparatively better potentiality to survive at low temperatures (below 15°C) than other varieties.
展开▼
