63ª Reunião Anual da SBPC

E. Ciências Agrárias - 1. Agronomia - 5. Agronomia

Assimilated nitrogen forms in 14 genotypes of common bean

Jane Pereira Felipe 1 Odyone Nascimento da Silva 1 Izabelle Pereira Andrade 1 Allan Klynger da Silva Lobato 1 Daniela Viana da Costa 1 Railan do Nascimento Ferreira 1

1. Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia

INTRODUÇÃO:

Nitrogen supply exercise fundamental role in protein formation and nitrate and ammonium by be two nitrogen forms that can be assimilated by higher plants, it can influence nitrogen compounds, and consequently in biological processes such as plant growth, as well as filling and composition grain. Aim of this study was to investigate capacity of formation linked to nitrogen compounds in 14 genotypes of Phaseolus vulgaris, using as parameters nitrate and free ammonium in leaf.

METODOLOGIA:

Study was conducted in experimental area located in Centro de Treinamento em Irrigação (CTI) of Universidade Estadual de Maringá (UEM), during 2008 season. Fertilization was carried out based in soil analysis and crop exigency. Plants were grown in field conditions with minimum/maximum temperature of 15.2/32.7ºC, and relative humidity was 48/74%, respectively. Experimental design used was randomized blocks, with 14 genotypes (IAPAR 81, IPR Tangará, IPR Uirapuru, BRS Campeiro, CHC 9729, CHP 9859, GEN C2-1-1, GEN C2-1-3, SM 1007, SN 1207, CNFC 10408, CNCF 10429, LP 0403, and LP 0472). Experiment was composed of 4 blocks, and each plot with 5x5 m (diameter x width), being used spacing of 1 and 2 m among plots and blocks, respectively. Nitrate and free ammonium were determined according to Cataldo et al. (1975) and Weatherburn (1967), respectively.In this study were evaluated nitrate and free ammonium. Data were analyzed employing a variance analysis, and using Scott-Knott test at 5% level of probability. Standard errors were also calculated in all treatments evaluated.

RESULTADOS:

Results linked to nitrate level in leaf of 14 genotypes revealed that there are 3 groups, being genotype CNFC 10429 presented higher nitrate amount. Other group is formed by 2 genotypes, CHC 9729 and LP 0403 that presented intermediate levels of nitrate in leaf, when compared with others. Group with lower nitrate level in leaf oscillated between 0.44 e 0.57 µmol NO3- g DM-1, and composed by other genotypes. In ammonium level in leaf the variance analysis indicated existence of 4 groups, being that genotypes with higher ammonium assimilation were IPR Tangará, SM 1007, and CNFC 10408 with values of 25.09, 24.76, and 26.35 µmol NH4+ g DM-1, respectively. In other group were showed genotypes GEN C2-1-1, GEN C2-1-3, and LP 0472. In addition, group with smaller level was composed by genotypes IAPAR 81, IPR Uirapuru, CHP 9859, and LP 0403.

CONCLUSÃO:

High concentration of nitrate was found in CNFC 1042, and ammonium in IPR Tangará, SM 1007, and CNFC 10408 genotypes, being these compounds the assimilated nitrogen forms by plants, and it probably will promote higher growth, development, and grain filling.

Palavras-chave: ammonium, Phaseolus vulgaris, nitrate.