Abstract
Cold stress at seedling stage is a serious concern to the sustainable rice production in some regions of the world. A field experiment was carried out to investigate the physiological parameters of seedlings of selected five rice cultivars, namely Binadhan-6, BR-26, BRRI dhan28, BRRI dhan29, and BRRI dhan50 (Banglamoti) for cold survival mechanism during low temperature in the Northwest Bangladesh. The field experiment was arranged following Randomized Complete Block Design (RCBD) with three replications. The physiological parameters such as leaf proline, chlorophyll, total carotenoid content, relative water content (RWC) and starch were determined. In this study, the rice cultivars showed significant variation of physiological activities at low temperature. BRRI dhan28 synthesized the highest amount of proline (1.25 mg g-1), chlorophyll-a (2.63 mg g-1), chlorophyll-b (0.85 mg g-1), relative water content (93.33%) and starch (28.21%) content. Significant variability was observed among the cultivars during the experiment time for their survivability. The sequence of survival potentiality was observed as BRRI dhan28> BRRI dhan29> BR-26> BINA dhan-6> BRRI dhan50. The present finding infers that BRRI dhan28 showed the best survival potentiality based on the synthesis of proline, chlorophyll and other physiological parameters.
Highlights
Bangladesh is the most vulnerable to climate change for its geographical location and facing extreme weather like, longer winter chilling cold, hot and higher temperature during summer, uneven precipitation during boro and other crop season, frequent storm, cyclone, tornado, strong western wind
The synthesis of leaf proline in the rice seedlings of different cultivars during the experiment period is shown in the Table 1
The present study indicated that some of the tested cultivars produced greater amount chlorophyll-a that was important for survival capability during low temperature (Table 2)
Summary
Bangladesh is the most vulnerable to climate change for its geographical location and facing extreme weather like, longer winter chilling cold, hot and higher temperature during summer, uneven precipitation during boro and other crop season, frequent storm, cyclone, tornado, strong western wind. The Northwest Bangladesh is more susceptible to climate change effects especially sudden cold wave and chilling stress in winter affects rice seedling growth in Northwest Bangladesh. These effects are mostly related with food production resulted in threatening to food security in Bangladesh. Low temperature at the seedling stage can Bikash Chandra Sarker et al.: Physiochemical Responses and Cold Survival Mechanism of Rice Seedlings of Selected Cultivars in Northwest Bangladesh result in poor germination, stunted, yellowing or withering, and reduced tillering as reported by Tuteja et al 2012 [14]
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