Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Evaluation of Exotic Wheat (triticum Aestivum L.) Genotypes for Heat Tolerance on the Basis of Physiological Phenotyping

Kaji Md. Wayaz Hossain
Department of Genetics & Plant Breeding, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Sharif Ar Raffi
Department of Genetics & Plant Breeding, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Plant physiological parameters such as membrane thermostability, canopy temperature depression, leaf chlorophyll content and yield related traits like no. of spikelets per spike, no. of grains per spike, 200-grain weight and grain yield of 18 wheat genotypes were carried out to assess for heat tolerance. Performances of all the genotypes were found to have significant differences for all the traits except canopy temperature depression. But, canopy temperature depression with some other traits like leaf chlorophyll content, no. of grains per spike, 200-grain weight and grain yield per plant demonstrated significant differences when it grown in heat stress condition. In general, genotypes with higher leaf chlorophyll content and enhanced membrane thermostability demonstrated higher 200-grain weight or grain yield. Besides, in spite of having heat tolerant traits, several genotypes performed poor due to their poor genotypic potential. The present investigation has successfully isolated several genotypes viz. H024, H023, H022 and H018 with desirable traits related to heat tolerance based on overall performance while grown under heat stress. These genotypes can be used as gene source for future breeding program to improve heat tolerance of the local wheat cultivars.

Keywords: Heat tolerance; Wheat; Physiological traits

Location: Field Experimental Laboratory, Dept. of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Variety and Species

Commodity: Wheat

Objectives:

The main objective of this study was to evaluate some exotic wheat genotypes to identify heat tolerant genotypes for using in future breeding program and to prepare a ranking table on the basis of physiological traits to identify the best genotype.

Methodology:

Experiment was conducted with 18 wheat genotypes among them 14 were exotic (designated as HO18 to HO31; collected from International Maize and Wheat Improvement Center [CIMMYT], Mexico) and 4 were popular genotypes (Shourav, Gourab, Shatabdi, Sonalika, collected from BAU germplasm) in 2014-15 at Field Experimental Laboratory, Dept. of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh. Experiment was conducted with three replications and two treatments in a Randomized Completely Block Design (RCBD). Optimum time sowing (15 November, 2014) considered as first treatment and late sowing by one month (15 December, 2014) for imposing heat stress was second treatment. Data on physiological traits such as canopy temperature depression, leaf chlorophyll content, membrane thermostability and some other yield contributing characters such as number of spikelets per spike, no. of grains per spike, 200-grain weight and yield per plant (g) were recorded on the basis of following procedures as indicated below. The recorded data on different parameters were analyzed by using MINITAB version 17.0, MSTAT-C and MS Excel® 2007. According to Pietragalla (2012), infra-red thermometer (Model: CEM DT8818) was used to record the canopy temperature depression (CTD) at 89 DAS in both treatments during which control treatment was in 27^oC and 2nd treatment had 29⁰C day temperature at noon. Leaf chlorophyll content at anthesis (GS65) was measured with a SPAD meter (Minolta-502) from five flag leaves of each genotype in a replication in CCI (chlorophyll concentration index) between 12.00–14.00 h of in fine windless and cloudless days. Membrane thermostability was measured by following the guideline of Yildirim et al. (2009) from eight fully expanded leaves of each genotype, collected from randomly selected plants of each replication. The percentage of solute leakage was estimated by using the following equation-
So, Leaf Membrane Thermostability (MTS%) = (1- T1/T2) x100

Where, T refer to electrical conductivity of heat treated samples, and the subscript 1 and 2 refer to electric conductivity readings before and after boiling for 1 hr, respectively.
Number of spikelet’s per spike, no. of grains per spike, 200-kernels weight (g), grain yield (g) were measured as per description of Pietragalla and Pask (2012).

Source of Information: J Bangladesh Agril Univ 16(3): 457–463, 2018 ISSN 1810-3030 (Print) 2408-8684 (Online)

Article Link (Online Journal): https://doi.org/10.3329/jbau.v16i3.39417

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Heat tolerance in wheat has been in the prime research priority in wheat growing areas considering global warming and changing cropping pattern. Therefore, wheat genotypes with different heat tolerance traits have great importance in developing heat tolerant wheat varieties. The present study identified several genotypes with different gradients of heat tolerant traits. These genotypes may be used for future breeding program for heat tolerant variety development to mitigate the heat stress problem for increased wheat production.

Knowledge Management: Journal