MAGALHAES, K. S.

NEGRI, B. F.

SOUSA, S. M.

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3217 - Crop Physiology and metabolismKarla Sabrina MagalhãesROOT MORPHOLOGICAL ANAL YSIS OF A MAIZE DIVERSITY PANELMagalhães,KS; Negri,BF; Desousa,SM;UFSJ, EMBRAPA MAIZE ANO SORGHUM; UFSJ, EMBRAPA MAIZE ANO SORGHUM; UFSJ,EMBRAPA MAIZE ANO SORGHUM;The modular structure of roots enables thern to quickly respond to their surrounding environment,making plants more adaptable to environmental changes, such as water availability and nutrientsupply. Certain root system types can help increase the yield due to their higher capacity to acquirenutrients and water. Our work aimed to study root morphological traits of a maize diversity panel,composed of two hundred inbred lines from Embrapa Maize and Sorghum breeding programo Thepanel was analyzed in a completely randomized experimental design with three biological replicates.Maize seeds were surface sterilized with sodium hypochlorite and germinated in moistened paperrolls. After four days, uniform seedlings were transferred to moistened paper pouches and kept inMagnavaca's solution under controlled conditions. Nutrient solution was changed every three daysand the pH was maintained at pH 5.6. In order to analyze and quantify root traits, roots werephotographed after 13 days, and the images were processed and analyzed using WhinRhizosoftware. Four root traits were quantified: length, volume, diameter and volume of fine roots (1-2mm). Low coefficient of variation, 25.3, 20.2, 7.2 and 24.5% and high heritability 78.2,79.7,77.6and 79.2% were detected for length, volume, diameter and volume of fine roots, respectively.Principal Component Analysis (PCA) was applied, enabling differentiation of genotypes based onthe selected root morphology traits. PC1 explained 64.6% and PC2 33.09% of variation of the maizelines. PC1 had positive eigenvector coefficients for ali variables, except for root diameter, and wasexplained mostly by length and volume. PC2 had a negative eigenvector coefficient for length andwas explained mostly by root diameter. The information generated by this study will be useful forestablishing early selection strategies for selecting maize plants more efficient in water and nutrientacquisition. Supported by Embrapa, CNPq, Fapemig and Generation Challenge Program (GCP).

Root morphological analysis of a maize diversity panel.

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/934108/1/Rootmorphological.pdf

Root morphological analysis of a maize diversity panel.

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