Evaluation of rice wild relatives as a source of traits for adaptation to iron toxicity and enhanced grain quality

Autoři: Birgit Bierschenk aff001;  Melle Tilahun Tagele aff001;  Basharat Ali aff001;  M. d. Ashrafuzzaman aff001;  Lin-Bo Wu aff001;  Matthias Becker aff001;  Michael Frei aff001
Působiště autorů: Institute for Crop Science and Resource Conservation (INRES), University of Bonn, Bonn, Germany aff001;  Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, Pakistan aff002;  Department of Genetic Engineering & Biotechnology, Shahjalal University of Science & Technology, Sylhet, Bangladesh aff003
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0223086


Rice wild relatives (RWR) constitute an extended gene pool that can be tapped for the breeding of novel rice varieties adapted to abiotic stresses such as iron (Fe) toxicity. Therefore, we screened 75 Oryza genotypes including 16 domesticated O. sativa genotypes, one O. glaberrima, and 58 RWR representing 21 species, for tolerance to Fe toxicity. Plants were grown in a semi-artificial greenhouse setup, in which they were exposed either to control conditions, an Fe shock during the vegetative growth stage (acute treatment), or to a continuous moderately high Fe level (chronic treatment). In both stress treatments, foliar Fe concentrations were characteristic of Fe toxicity, and plants developed foliar stress symptoms, which were more pronounced in the chronic Fe stress especially toward the end of the growing season. Among the genotypes that produced seeds, only the chronic stress treatment significantly reduced yields due to increases in spikelet sterility. Moreover, a moderate but non-significant increase in grain Fe concentrations, and a significant increase in grain Zn concentrations were seen in chronic stress. Both domesticated rice and RWR exhibited substantial genotypic variation in their responses to Fe toxicity. Although no RWR strikingly outperformed domesticated rice in Fe toxic conditions, some genotypes scored highly in individual traits. Two O. meridionalis accessions were best in avoiding foliar symptom formation in acute Fe stress, while an O. rufipogon accession produced the highest grain yields in both chronic and acute Fe stress. In conclusion, this study provides the basis for using interspecific crosses for adapting rice to Fe toxicity.

Klíčová slova:

Cereal crops – Domestic animals – Leaves – Oryza – Plant resistance to abiotic stress – Rice – Seeds – Toxicity


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