Development of High Yielding Deep Water Rice Variety BRRI dhan91 for Semi Deep Flooded Ecosystem of Bangladesh

Abstract

Deep water rice ecosystem represents the flood-prone rice ecosystem where rice plant requires elongation ability to reach the surface with a certain amount of plant height to withstand in stagnant flood water condition. Low yield potentiality of locally adapted deep water cultivars limits the total rice production in the country. In present study, efforts were made to evaluate the suitability and adaptability of newly developed high yielding deep water breeding line BR10230-15-27-7B and control variety Fulkori under semi deep water ecosystem of farmer’s field condition in three consecutive years. At six locations, water depth varied from 60 to 140 cm under semi deep water ecosystem. In 2016 and 2017, mean yield of the line ranged between 2.9 to 3.1 t ha-1 while 1.7 t ha-1 for the local control variety Fulkori. However, around 1.0 t/ha yield advantage was found for the newly developed breeding line. Thus, the higher yield potentiality of the breeding line under 140 cm water depth conditions suggested its suitability under shallow flooded environments. During final evaluation in 2018, larger variation was observed in terms of grain yield ranging from 1.1 to 3.8 t ha-1 for the line while 0.4 to 1.7 t ha-1 for the control variety when evaluated under actual deep water areas. This result also supported that this line have greater potentiality under shallow flooded condition. In addition, the breeding line exhibited similar plant height with at least six days earliness compared to the control variety. Finally, National Seed Board (NSB) approved this line as variety and designated as BRRI dhan91 for broadcast Aman (B. Aman) season. In future, this new rice variety could help the local rice growers to cultivate modern high yielding rice variety in shallow flooded environments. BRRI dhan91 also showed better performance for tallness with lodging tolerance, submergence tolerance and moderate elongation ability under shallow flooded conditions.
 Bangladesh Rice j. 2019, 23(1): 57-63

Rice and food security: Climate change implications and the future prospects for nutritional security

“…In the future, the new semi‐deep water rice variety BRRI dhan91 could be a promising solution for ensuring food security by incorporating additional areas into modern rice agriculture. BRRI dhan91 could be employed in a crossing program to develop tallness with a strong stem, submergence tolerance, and moderate stem elongation ability (Shalahuddin et al, 2020). However, based on current research, it is believed that deep‐water rice yield potential can be increased for future climates.…”

Development of rice varieties BRRI dhan93, BRRI dhan94 and BRRI dhan95 for rainfed lowland ecosystem of Bangladesh

“…The highest yield was found in BR-RS(Raj)-PL4-B (5.89 t/ha) followed by BR-SF(Rang)-PL1-B (5.79 t/ha) and BR8210-10-3-1-2 (5.65 t/ha) over the check variety BRRI dhan49 (5.06 t/ha). The growth duration of BR-SF(Rang)-PL1-B and BR-RS(Raj)-PL4-B was similar to BRRI dhan49, but the growth duration of BR8210-10-3-1-2 was around one week earlier than BRRI dhan49 (Shalahuddin et al, 2019). Among the newly released varieties, BRRI dhan94 has the highest potentiality to give maximum yield (7.40 t/ha) followed by BRRI dhan93 (7.25 t/ha) and BRRI dhan95 (6.55 t/ha) compared with check variety BRRI dhan49 (6.20 t/ha) (Figure 7).…”