Screening Wheat Genotypes for Coleoptile Length: A Trait for Drought Tolerance
American Journal of Agriculture and Forestry
Volume 2, Issue 6, November 2014, Pages: 237-245
Received: Sep. 30, 2014; Accepted: Oct. 15, 2014; Published: Oct. 30, 2014
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Md. Farhad, Wheat Research Centre, BARI, Nashipur, Dinajpur-5200, Bangladesh
Md. Abdul Hakim, Wheat Research Centre, BARI, Nashipur, Dinajpur-5200, Bangladesh
Md. Ashraful Alam, Wheat Research Centre, BARI, Nashipur, Dinajpur-5200, Bangladesh
N. C. D. Barma, Regional Wheat Research Centre, BARI, Joydebpur, Gazipur-1701, Bangladesh
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The study was conducted during Rabi season of 2013-14 at the Wheat Research Centre (WRC), Bangladesh Agricultural Research Institute (BARI), Dinajpur. Thirty wheat genotypes including local control BARI Gom 26 were evaluated in split-split plot design having two replications with irrigation in the main plot, seeding depth in a sub-plot and genotype was in sub-sub-plot. The main objective of this study was to evaluate new exotic lines against drought, with emphasis on coleoptile length under Bangladeshi conditions, and to identify drought tolerant germplasm. To measure potential coleoptile length (CL), disease free, healthy, uniform seeds were sown in wooden trays with sandy soil in a temperature controlled room at 200 degree days (20o c X 10 days). The genotypes were evaluated for yield, and yield components i.e., plant establishment, plant height (cm), spikes per m2, grains per Spike, 1000-grain weight (g) and visual grain quality. Selection of genotypes was based on Schneider’s stress severity index (SSSI), yield under drought condition and coleoptiles length. Deep seeding over normal seeding had a significant effect on yield and the yield components, as did water stress. The interaction of the two factors showed that seeding depth causes more yield loss than irrigation. More traits showed significant relationships in deep seeding conditions than normal conditions, meaning that there is greater scope for screening wheat using sowing depth. Based on higher negative value of SSSI and higher yield in deep sowing conditions the genotypes G 16, G 13, G 12, G 24, G 2, G 18, G 19 and G 3 were primarily selected for drought tolerance and will be evaluated further for advanced studies. These genotypes also have longer coleoptiles ranging from 7.4 to 10.5 cm.
Wheat, Drought Tolerance, Deep Sowing, Coleoptile Length, Irrigation, Index
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Md. Farhad, Md. Abdul Hakim, Md. Ashraful Alam, N. C. D. Barma, Screening Wheat Genotypes for Coleoptile Length: A Trait for Drought Tolerance, American Journal of Agriculture and Forestry. Vol. 2, No. 6, 2014, pp. 237-245. doi: 10.11648/j.ajaf.20140206.11
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