SCREENING OF COLD TOLERANT, SHORT DURATION AND HIGH YIELDING RICE LINES SUITABLE FOR NORTHERN PART OF BANGLADESH
Rice, like many crops is lack of acclimatization ability to cold temperature that limits reducing crop yield worldwide. Three cold tolerant, long duration, and short bold grain (Manjusree-2, Komol-7 and Komol-9) exotic varieties were backcrossed with popular high yielding, short duration, long slender grain, Binadhan-17 to develop cold tolerant, short duration with fine grain quality rice varieties for ensuring stable yields over cold stress environments in Bangladesh. Eighteen BC1F4 backcross lines along with check variety were evaluated over three locations, viz. Nilphamari, BINA Sub-station Rangpur, and BINA HQs farm, Mymensingh at reproductive stage. Among them six lines of Manjusree-2, three lines of Kamol-7 and six lines of Kamol-9 showed cold acclimatization with high yield potential. Crop duration was 144-160 days depending on the locations and varieties. Although the plant height of these lines was tall but did not lodge. Yield attributing characteristics of these lines were found better than parents with higher number of effective tillers, filled grains, long panicle and higher yield. Therefore, these advanced lines could be released as cold tolerant rice varieties along with high yield for Northern cold prone areas of Bangladesh after further trials and following variety release procedure.
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