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Wheat Genotypes as Affected by Terminal Heat Stress in Northern Bangladesh

P. Bala*
Department of Agriculture, Hazi Lalmia City College, Gopalganj, Bangladesh

S. Sikder
Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Abstract/ Executive Summary:

This study was conducted in Crop Physiology and Ecology research field of Hajee Mohammad Danesh science and Technology University, Dinajpur during the two successive years of 2011-12 and 2012-13 to identify morpho-physiological attributes of wheat genotypes in response to terminal heat stress. In this respect, three sowing dates at November 27 (normal), December 17 (late) and January 7 (very late growing condition) and eight wheat genotypes viz., Pavon-76, Prodip, BARI Gom-25, BARI Gom-26, BAW-1143, BAW-1146, BAW-1147 and BAW-118 were evaluated. Growth and morphological changes of wheat genotypes were evaluated in relation to heat tolerance in field condition. Growth attributes such as LAR, SLA and LWR for all the genotypes declined throughout the advancement of growth stages in both the growing seasons and at heat stress condition values of all the parameters such as plant height and grain yields were reduced compared to normal condition.

Keywords: Cereal crops, Yield attributes, High temperature, Climate change

Location: Crop Physiology and Ecology research field of Hajee Mohammad Danesh science and Technology University, Dinajpur

Start Date: 00-00-2011

End Date: 00-00-2013

Program Area: Variety and Species

Commodity: Wheat

Objectives:

This experiment was carried out to select suitable wheat genotypes for growing under late sowing conditions.

Methodology:

The experiment was conducted in the research field of Crop physiology and Ecology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh from November to April of 2011-12 and 2012-2013. Seeds were sown on 27 November (Normal), 17 December (Late) and 7 January (Very late) in main plot and eight genotypes viz. Prodip, BARI Gom-25, BARI Gom-26, BAW-1143, BAW-1146, BAW-1147, BAW-1148 and Pavon-76 in sub-plot as experimental materials. The experimental design was a split- plot with three three replications with plot size 2.5 m x 4 m. Three irrigations were applied at CRI, flowering and grain filling stage. In all sowing dates, at each harvest, the plants were cut off at the ground level and the tops were separated into leaves, stem and panicle (if present) at 10 days interval with start of 20 days after sowing. The harvested plant parts were kept in an electrical oven at about at 70º C for 72 hours and the dry weights of these parts were taken by an electrical balance. Leaf area was determined as function of length maximum width × 0.75 (Mossad et al. 1995).

From the dry weight of different plant parts and leaf area data, the following growth attributes were calculated between two successive harvests. Plant height was measured from base of plant to the tip of spike excluding awn with the help of a measuring scale. Ten plant samples from each plot were taken and mean was calculated. The data were analyzed by using MSTAT-C computer package. The treatment means were compared using Duncan’s Multiple Range Test (DMRT).

Source of Information: Bangladesh Agron. J. 2018, 21(1): 25-37

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Genotypes BAW-1143, BARI Gom-25, BARI Gom-26 and Prodip showed higher SLA compared to genotypes BAW-1146, BAW-1147, and BAW-1148. However, genotype Pavon-76 always showed the lowest SLA at all the DAS and sowing times compared to the other genotypes. Under late and very late growing condition all the genotypes had higher LWR at the early stages of growth and then declined gradually with increasing plant age. In this condition at 40 DAS, the normal growing condition for LWR values of BAW-1146, BAW-1147, BAW- 1148 and Pavon-76 were higher compared to their respective late growing condition. Under normal growing condition of both the years, BAW-1143, BARI Gom-25, BARI Gom-26 and Prodip showed comparatively lower LWR at all the DAS compared to other genotypes. LAR of all the genotypes started from a higher value at the initial stages of growth and then declined throughout the successive days after sowing in each growing condition both the years. In late and very late growing condition, at the initial stage all the genotypes showed higher LAR compared to normal growing condition except Pavon-76 in both the years. At this initial stage, again BAW-1143 attained the highest LAR and Pavon-76 showed the lowest LAR. Plant height was found higher late and very late growing condition. Genotypes BAW-1143, BARI Gom-25, BARI Gom-26 and Prodip showed higher relative grain yield than that of BAW-1146, BAW- 1147 and BAW-1148

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