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Evaluation of Triticum durumAegilops tauschii derived primary synthetics as potential sources of heat stress tolerance for wheat improvement

Published online by Cambridge University Press:  19 March 2021

Amandeep Kaur*
Affiliation:
School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
Parveen Chhuneja
Affiliation:
School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
Puja Srivastava
Affiliation:
Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, India
Kuldeep Singh
Affiliation:
School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
Satinder Kaur
Affiliation:
School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
*
*Corresponding author. E-mail: aman-coasab@pau.edu

Abstract

Addressing the impact of heat stress during flowering and grain filling is critical to sustaining wheat productivity to meet a steadily increasing demand from a rapidly growing world population. Crop wild progenitor species of wheat possess a wealth of genetic diversity for several biotic and abiotic stresses, and morphological traits and can serve as valuable donors. The transfer of useful variation from the diploid progenitor, Aegilops tauschii, to hexaploid wheat can be done through the generation of synthetic hexaploid wheat (SHW). The present study targeted the identification of potential primary SHWs to introduce new genetic variability for heat stress tolerance. Selected SHWs were screened for different yield-associated traits along with three advanced breeding lines and durum parents as checks for assessing terminal heat stress tolerance under timely and late sown conditions for two consecutive seasons. Heat tolerance index based on the number of productive tillers and thousand grain weight indicated that three synthetics, syn9809 (64.32, 78.80), syn14128 (50.30, 78.28) and syn14135 (58.16, 76.03), were able to endure terminal heat stress better than other SHWs as well as checks. One of these synthetics, syn14128, recorded a minimum reduction in thousand kernel weight (21%), chlorophyll content (2.56%), grain width (1.07%) despite minimum grain-filling duration (36.15 d) and has been selected as a potential candidate for introducing the terminal heat stress tolerance in wheat breeding programmes. Breeding efforts using these candidate donors will help develop lines with a higher potential to express the desired heat stress-tolerant phenotype under field conditions.

Type
Research Article
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of NIAB

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Footnotes

Present address: National Bureau of Plant Genetic Resources, Pusa Road, New Delhi, India.

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