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Research Detail

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Sharifunnessa Moonmoon
Former PhD Student
Department of Crop Botany, BAU, Mymensingh-2202, Bangladesh

Dr. Md. Solaiman Ali Fakir
Professor
Department of Crop Botany, BAU, Mymensingh-2202, Bangladesh

Dr. Md. Tariqul Islam
Principal Scientific Officer and Head
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Drought is one of the most prevalent forms of abiotic environmental stress that reduce crop productivity. A pot experiment was performed in two ‘aman’ seasons under drought (40% FC) and control (100% FC) to study drought tolerance mechanism(s) based on morphological and dry matter partitioning in six rice genotypes at the panicle initiation stage. Twelve treatments (6 genotypes × 2 irrigations) were arranged in CRD and the experiment was carried out at Bangladesh Institute of Nuclear Agriculture, Bangladesh Agricultural University, Mymensingh. Important morphological and DM data were significantly (P>0.05) decreased at 40% FC. Among the data, an important drought tolerance mechanism was the higher root and shoot ratio. Tolerant genotypes had a smaller reduction in shoot and root DM than sensitive ones. Low reduction percentages of the traits under drought stress to that of the control discriminated Binadhan-13 and NERICA mutant genotypes consistently as drought-tolerant at this specific stage.

  Drought stress, Panicle initiation stage, Morphology, Dry matter partitioning, Rice
  BINA, Mymensingh
  01-07-2013
  31-12-2014
  Risk Management in Agriculture
  Rice

To study drought tolerance mechanism(s) based on morphological and dry matter partitioning in six rice genotypes at panicle initiation stage

The pot experiment was conducted with six rice genotypes viz. Binadhan-13, BRRI dhan34, Ukunimadhu, RM-100-16, Kalizira and NERICA mutant. The experiment was set in a two factorial CRD with three replications in two seasons. The first factor was rice genotypes and the second factor was irrigations: control (100% FC) and drought (40% FC) stresses treatments. Before starting stress imposition, all the pots received water at 100 % field capacity level. Drought (40 % FC) was imposed at 50 days after transplanting when plants had attained panicle initiation stage. Harvests were made after seven days of stress imposition (57 DAT) at panicle initiation stage for dry matter production and partitioning. After harvesting, the plant samples were separated into root, stem and leaf. Plant height, number of green leaves, number of total tillers, root dry weight, stem dry weight, leaf dry weight, shoot dry matter at panicle initiation stage was calculated. Root-Shoot ratio at panicle initiation stage was calculated by shoot dry matter divided by root dry matter. The percent reduction of each parameter under drought stress compared to control was calculated for each genotype using formula: Relative increase or decrease (%) = (Data for control treatment – Data for drought treatment)/ (Data for control treatment) × 100. Mathematically, (-) ve value indicate an increase and (+) ve one decrease. The collected data were analyzed statistically following Completely Randomized Design by MSTAT-C computer package programme developed by Russel (1986). The treatment means were adjudged by Duncan's Multiple Range Test (DMRT).
 

  Fourrages 242(6):19-30 (2020)
  https://www.researchgate.net/publication/343722915_Effect_of_drought_on_morphology_and_dry_matter_partitioning_at_panicle_initiation_stage_in_rice_genotypes
Funding Source:
1.   Budget:  
  

The experiment was conducted in both the seasons to investigate morpho-physiological features by imposing drought (40 % FC) at panicle initiation stage to find out the tolerance mechanism. Two genotypes (BINAdhan-13 and NERICA) showed lower reduction under drought compared to control in morphological parameters compared to all remainders. Likewise, apart from significant interaction between genotypes and irrigation treatments, relative reduction of dry matter growth in leaf, stem, root and shoot, and root-shoot ration also showed smaller in the same two genotypes, respectively; compared to all others. Moreover, their relative reduction under drought as compared to respective control showed lower in general in Binadhan-13 and NERICA mutant genotypes. Thus, suggest their tolerance level to drought in key physiological features apart from morphological and water relation standings.
 

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