AZEVEDO, G.

GUIMARAES, C. T.

MATOS, F.

NEGRI, B.

SOUSA, S. M. de

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P223Root traits analysis of recombinant inbred fines underlying phosphorusacquisition efficiency in maize(submitted by Sylvia Morais de Sousa <smsousa@cnpms.embrapa.br»Full AuthorList: Negri, Barbara F12; Azevedo, Gabriel Cl,; Matos. Fabiano MI; Guimarães, Claudia TI; de Sousa,Sylvia MII Embrapa Maize and Sorghum, CP 151, Sete Lagoas, MG, Brazil, 35701-9702 UNIFEMM, Av.Marechal Castelo Branco, 2765, Sete Lagoas, MG. Brazil, 35701-2423 UFMG, Av. Antônio Carlos, 6627, Belo Horizonte, MG, Brazil, 31270-901Phosphorus (P) is essential macronutrient for plants, which is acquired from the rhizosphere solution as phosphate (Pi),prirnarily in the forrn ofH2PO-4. The concentration ofPi in the soil solution is often low, therefore the supply ofPi tothe root surface by diffusion is slow. Hence, P is one ofthe least available mineral elernents in the soil and frequentlylirnits plant growth. Crop production always requires P fertilizers to maintain yield and quality. An alternative toameliorate this problern is to explore the genetic diversity availabJe in plants and breed more Pi-absorption efficientcultivars in cornbination with soil rnanagement practices. This study airned to analyze rnaize root traits that could beinvolved in P acquisition effíciency. We used a paper pouch systern with Magnavacas nutrient solution (low P - 2.5uM) under a controlled environrnent to evaluate four root traits (length, volume, diarneter and volume of fine roots) in apopulation of J 45 recornbinant inbred lines (RILs) derived from a cross between maize genotypes L3 and L22, whichhave contrasting adaptation to low P availability in the field. High heritability (79.1 to 86.1 %) and low coefficient ofvariation (7.1 to 22%) were detected for the root traits. Additionally, Principal Component Analysis (PCA) enabled usto differentiate contrasting maize RILs based on the selected root morphology traits. The first principal cornponent(PC I) explained 66.2% of the variation while the second principal component (PC2) explained 31.2%. PCI hadpositive eigenvector coefficients for ali variables, except for root diarneter. PCI was explained most by root volumeand PC2 was explained mostly by root diarneter, allowing identification ofthe lines with contrasting root system traits.These phenotypic results will be used in the discovery ofroot morphology QTLs that are also involved on P acquisitionefficiency in maize.Funding acknowledgement: Ernbrapa, CNPq, Fapernig and Generation Challenge Program (GCP)159

Root traits analysis of recombinant inbred lines underlying phosphorus acquisition efficiency in maize.

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