SHAKIR HOSEN1, MD. ABDUR RAHMAN2, SAIMA JAHAN3, MUHAMMAD ALI SIDDIQUEE1 and HABIBUL BARI SHOZIB1*
1Grain Quality and Nutrition Division, Bangladesh Rice Research Institute (BRRI), Gazipur, 2MS Student, Department of Genetic Engineering and Biotechnology, Chittagong University, Chittagong and 3Lecturer, Department of Applied Statistics, East West University, Dhaka, Bangladesh.
*Corresponding author’s: shozib11@gmail.com
ABSTRACT
The study was conducted at the Grain Quality and Nutrition Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh during Aus season 2015-2016. Bangladesh has an agrarian economy in which rice is the dominant crop. Despite pressure from over population, the country has reached self-sufficiency in rice production through Boro rice seasons by using huge amount of ground water. However, ground water irrigation has started to show serious consequences as energy costs are increasing, water levels are declining in the intensive irrigated areas of Bangladesh. So, Aus cultivation should increase in this regard to cope the challenges. In the present study, we have focused to evaluate the physicochemical and cooking properties of some Aus cultivars or landraces which were used to cultivate without irrigation or less irrigation in Bangladesh earlier in Aus season. Due to low yield potential, these cultivars were become outdated. The physicochemical parameters such as appearance, milling outturn (MOT), length (mm), L/B ratio, size and shape; chemical parameters such as Alkali Spreading Value (ASV), Apparent Amylose Content (AAC), protein content and cooking characteristics such as cooking time, Imbibition Ratio (IR), Elongation Ratio (ER) were studied and evaluated for nine (9) traditional cultivars or landraces in comparison with five (5) high yielding varieties (BRRI HYV) for Aus season. The MOT percentage is ranged from 67.4 to 72%. The highest MOT was found in Chakulia (71%). L/B ratio varied from 2.1 to 3.8 mm for varieties. Our data reveals that AAC varied from 21 to 28% and protein content varied from 7.0 to 10.0%. The highest AAC and protein content were found in the local variety of Goria (27.5%) and Bolorum (10.0%) respectively. Both showed intermediate level of ASV score (4.5). Since these traditional rice cultivars had shown superior grain quality parameters for few physicochemical and cooking parameter compare to HYV. So, the acquainted information might be helpful for plant breeders to focus on these examined superior Aus cultivars to select as parental materials for Aus rice breeding program in Bangladesh.
Keywords: Apparent Amylose Content, Physicochemical characteristics, Traditional rice cultivars and Landraces.