Abstract
There is potential sources of alleles and genes currently locked into wheat-related species that could be introduced into wheat breeding programs for current and future hot and dry climates. However, neither the intra- nor the inter-specific diversity of the responses of leaf growth and transpiration to temperature and evaporative demand have been investigated in a large diversity of wheat-related species. By analysing 12 groups of wheat-related sub-species, we questioned the n-dimensional structure of the genetic diversity for traits linked to plant vegetative structures and development, leaf expansion and transpiration together with their responses to "non-stressing" range of temperature and evaporative demand. In addition to provide new insight on how genome type, ploidy level, phylogeny and breeding pressure together structure this genetic diversity, this study provides new mathematical formalisms and the associated parameters of trait responses in the large genetic diversity of wheat-related species. This potentially allow crop models predicting the impact of this diversity on yield, and indicate potential sources of varietal improvement for modern wheat germplasms, through interspecific crosses.
Highlights
Cereal production is affected worldwide by high temperature, high evaporative demand and drought
In addition s to provide new formalisms of trait responses together with model parameters to be included in u process-based models for large-scale simulations, this study indicates potential sources of varietal n improvement for modern wheat germplasms, currently locked into related species. a Materials and Methods M Plant Material d We analysed 12 wheat-related species (Fig. 1) and selected five accessions per species in order to te maximise the genetic diversity in each species (Supporting Information Tables S1 and S2)
Inter-specific variability of traits related to plant structure and rates of development, leaf expansion, and transpiration and their response to temperature and vapour pressure deficit
Summary
Cereal production is affected worldwide by high temperature, high evaporative demand and drought. We analysed 12 groups of wheat-related sub-species (five accessions each) for traits linked to vegetative structure and development, leaf expansion and transpiration together with their t responses to ranges of “non-stressing” temperature and evaporative demand during the vegetative ip phase.
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