1Wheat Research Center, Bangladesh Agricultural Research Institute, Dinajpur-5200 Bangladesh.Faculty of Biological Sciences, Astrakhan State University, Astrakhan 414056, Russia.
2aWheat Research Center, Bangladesh Agricultural Research Institute, Dinajpur-5200 Bangladesh.
3Wheat Research Center, Bangladesh Agricultural Research Institute, Dinajpur-5200 Bangladesh.
4Faculty of Agriculture and Graduate School of Agriculture, Kagawa University, Ikenobe, Miki-cho, 761-0795, P.O. Box 7, Miki cho post office, Ikenobe 3011-2, Kagawa-Ken, 761-0799, Japan.
5Faculty of Biological Sciences, Astrakhan State University, Astrakhan 414056, Russia.
Eight spring wheat cultivars were evaluated under three heat stress conditions
(early, late and very late) in order to identify suitable cultivars to develop heattolerant
genotypes resistant to future global warming. Results from the study indicate
that stress did not negatively affect flag leaf area in ‘Prodip’ and ‘Sufi’, flag leaf dry
matter partitioning in ‘Prodip’, ‘BARI Gom-26’ and ‘Shatabdi’, above-ground dry
matter partitioning in ‘Shatabdi’ and ‘BARI Gom-26’, seedling emergence in ‘Sufi’
and ‘BARI Gom-26’, or tiller production in ‘Sufi’ and ‘BARI Gom-26’. With respect
to lower yield reduction, relative performance and heat susceptibility index (HSI),
‘Sufi’ was highly heat stress-tolerant, followed by ‘BARI Gom-26’ and ‘Shatabdi’.
On the basis of HSI values in early heat stress and extremely late heat stress
(corresponding to early and extremely late sowing), ‘BARI Gom-26’ (HSI=0.10,
0.65) and ‘Shatabdi’ (0.22, 0.62) were highly tolerant to early heat stress and
moderately tolerant to extremely late heat stress while ‘Sufi’ was highly tolerant
(0.35) to extremely late heat stress and moderately tolerant (0.51) to early heat stress.
All other genotypes were susceptible to heat stress, among which ‘Gourab’ (2.19,
1.46) was the most susceptible followed by ‘Sourav’ (1.19, 1.42), ‘Prodip’ (1.03,
1.23), ‘BARIGom-25’ (1.61, 0.89) and ‘Bijoy’ (1.04, 1.28). Thus, ‘BARIGom-26’,
‘Shatabdi’ and ‘Sufi’ have the greatest potential to be used as high-yielding wheat
genotypes under warm to hot environments and could be used in a breeding
programme to develop heat-tolerant wheat.