Genotypic-specific responses caused by prolonged drought stress in smooth bromegrass (Bromus inermis): Interactions with mating systems |
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| Authors: | Fatemeh Saeidnia Mohammad M Majidi Soheila Spanani Mostafa Abdollahi Bakhtiari Zohreh Karami Nia Hughes |
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| Institution: | 1. Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan University of Technology, Isfahan, Iran;2. Department of Biotechnology and Plant Breeding, College of Agriculture, Sharekord University, Shahrekord, Iran;3. Department of Plant Agriculture, Ontario Agricultural College, University of Guelph, Guelph, Ontario, Canada |
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| Abstract: | The consequences of recurrent drought events compared with a single drought, and drought's interaction with deliberate selfing compared with open-pollination on postdrought recovery and persistence of smooth bromegrass, are not clear. This research was conducted to investigate the effects of recurrent drought stresses compared with a single drought on stress response, poststress recovery and persistence of full-sib and half-sib progenies of smooth bromegrass. During this study, 25 selfed (S1) and 25 open-pollinated (OP) progenies of smooth bromegrass created in 2012 were evaluated in the field under normal and recurrent drought stress during 2013–2016. After the first harvest of above-ground biomass in 2016, irrigation was withheld in both environments for 2 months; plants were subsequently re-watered and evaluated. Recurrent drought stress changed the relationships between different traits. Moreover, prolonged drought stress resulted in increased plant productivity (recovery aerial biomass; RABI) of S1 and OP populations in recurrent drought stress compared with normal environment. Mandatory selfing increased persistence of smooth bromegrass genotypes but did not affect recovery after prolonged drought stress. Results revealed that, selecting among S1 families would be more effective than OP ones. |
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| Keywords: | additive inheritance climate change inbreeding postdrought recovery |
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