Early exposure to phosphorus starvation induces genetically determined responses in Sorghum bicolor roots.

Autor: Mikwa EO; Department of Plant Breeding, Justus Liebig University, Giessen, Germany. erick.owuor.mikwa@ag.uni-giessen.de., Wittkop B; Department of Plant Breeding, Justus Liebig University, Giessen, Germany., Windpassinger SM; Department of Plant Breeding, Justus Liebig University, Giessen, Germany., Weber SE; Department of Plant Breeding, Justus Liebig University, Giessen, Germany., Ehrhardt D; Department of Plant Breeding, Justus Liebig University, Giessen, Germany., Snowdon RJ; Department of Plant Breeding, Justus Liebig University, Giessen, Germany.
Jazyk: angličtina
Zdroj: TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik [Theor Appl Genet] 2024 Sep 11; Vol. 137 (10), pp. 220. Date of Electronic Publication: 2024 Sep 11.
DOI: 10.1007/s00122-024-04728-4
Abstrakt: Key Message: We identified novel physiological and genetic responses to phosphorus starvation in sorghum diversity lines that augment current knowledge of breeding for climate-smart crops in Europe. Phosphorus (P) deficiency and finite P reserves for fertilizer production pose a threat to future global crop production. Understanding root system architecture (RSA) plasticity is central to breeding for P-efficient crops. Sorghum is regarded as a P-efficient and climate-smart crop with strong adaptability to different climatic regions of the world. Here we investigated early genetic responses of sorghum RSA to P deficiency in order to identified genotypes with interesting root phenotypes and responses under low P. A diverse set of sorghum lines (n = 285) was genotyped using DarTSeq generating 12,472 quality genome wide single-nucleotide polymorphisms. Root phenotyping was conducted in a paper-based hydroponic rhizotron system under controlled greenhouse conditions with low and optimal P nutrition, using 16 RSA traits to describe genetic and phenotypic variability at two time points. Genotypic and phenotypic P-response variations were observed for multiple root traits at 21 and 42 days after germination with high broad sense heritability (0.38-0.76). The classification of traits revealed four distinct sorghum RSA types, with genotypes clustering separately under both low and optimal P conditions, suggesting genetic control of root responses to P availability. Association studies identified quantitative trait loci in chromosomes Sb02, Sb03, Sb04, Sb06 and Sb09 linked with genes potentially involved in P transport and stress responses. The genetic dissection of key factors underlying RSA responses to P deficiency could enable early identification of P-efficient sorghum genotypes. Genotypes with interesting RSA traits for low P environments will be incorporated into current sorghum breeding programs for later growth stages and field-based evaluations.
(© 2024. The Author(s).)
Databáze: MEDLINE
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