63ª Reunião Anual da SBPC

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

Starch and sucrose in genotypes of common bean cultivated for Brazilian conditions

Odyone Nascimento da Silva 1 Izabelle Pereira Andrade 1 Allan Klynger da Silva Lobato 1 Daniela Viana da Costa 1 Emilly dos Santos Pereira 1 Talitha Soares Pereira 1

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

INTRODUÇÃO:

Carbon metabolism is responsible for regulation of compounds as sucrose, glucose, and starch, besides enzymes such as sucrose synthetase and invertase. In addition, sucrose is an important energy component exported from leaves to several plant organs. These carbohydrates are involved in processes such as energy transference, signal transduction, osmoprotection, and reserve. Aim of this study was to investigate compounds involved in carbon metabolism of 14 common bean genotypes, being measured starch and sucrose levels of leaf tissue.

METODOLOGIA:

Study was conducted in experimental area located in Centro de Treinamento em Irrigação (CTI) of Universidade Estadual de Maringá (UEM). 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. Starch and sucrose and starch were determined according to Van Handel (1968) and Dubois et al. (1956), respectively. In this study were evaluated starch and sucrose. 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:

Starch amounts in common bean plants indicate that there are three groups and group with higher starch level fluctuated between 0.68 and 0.70 mmol g DM-1, with this being formed by genotypes SM 1007, CNFC 10429, and LP 0472. Seven genotypes presented statistically equal results and lowers to other groups, in which was composed by IAPAR 81, IPR Tangará, IPR Uirapuru, CHC 9729, CHP 9859, GEN C2-1-1, and GEN C2-1-3 genotypes. In relation sucrose genotypes evaluated were grouped in 4 types, and group with greater sucrose level in leaf tissue were SM 1007, CNFC 10408, and LP 0472. Other group oscillated between 0.71 e 0.67 mmol g DM-1, and was formed by CNFC 10429 and LP 0403 genotypes. Minor amounts of sucrose were showed in IPR Tangará, BRS Campeiro, and GEN C2-1-1 genotypes.

CONCLUSÃO:

Results on starch and sucrose indicate equal behavior in these parameters, and SM 1007, CNFC 10429, and LP 0472 genotypes presented higher levels in these parameters. In addition, high levels of starch and sucrose in leaf is important information because suggested that there is greater energy transference of leaf to other plant.

Palavras-chave: carbon metabolism, energy transference, osmoprotection.