Showing papers by "André Rodrigues dos Reis published in 2016"
18 Jul 2016
TL;DR: In this article, a review aims to compile some information about research work on concentration of heavy metals until they reach the food chain for transferring to crops, which can cause losses in crop production and risks for human health.
Abstract: Heavy metal contamination in soils is a major environmental concern that affects large areas worldwide. Agricultural practices have been the main source of heavy metals in soil such as lead, chromium, arsenic, zinc, cadmium, copper and nickel. Plants can uptake this toxic metals and have evolved defense mechanisms to avoid or minimize damages. Exposure to toxic metals can intensify the production of reactive oxygen species (ROS), which are continuously produced in both unstressed and stressed plants cells. Some of the ROS are highly toxic and must be detoxified by cellular stress responses, if the plant is to survive and grow. Heavy metals contaminated plants cause losses in crop production and risks for human health. Thus, this review aims to compile some information about research work on concentration of heavy metals until they reach the food chain for transferring to crops.
51 citations
TL;DR: The DTZ staining associated with imageJ software is a promising to estimate Zn concentration in different grain tissues and may be useful for rapid screening of rice germplasms.
13 citations
TL;DR: Nitrogen (N) fertilization on maize crops has been going through modifications due to the use of technologies such as biological N fixation and modified fertilizers, but increasing side-dressed N levels is the main key factor responsible to improve the double cropped maize yield in tropical Brazilian savanna.
Abstract: Nitrogen (N) fertilization on maize crops has been going through modifications due to the use of technologies such as biological N fixation and modified fertilizers. This study aimed to evaluate the effect of seed inoculation with Azospirillum brasilense (with and without inoculation), N sources (urea and polymer coated urea) and side-dressed N levels (0; 45; 90; 135 and 180 kg ha -1 ), on double cropped maize in two regions of Brazilian savanna (Chapadao do Sul and Selviria, State of Mato Grosso do Sul). The experiment design was arranged in randomized plots at a 2 x 2 x 5 factorial scheme with 4 replications. The following characteristics were evaluated: plant population (plants ha -1 ), plant dry matter, leaf N concentration, stem diameter, weight of 100 grains and grain yield. Seed inoculation with A. brasilense did not increase double cropped maize yield in both environments. The application of coated urea provided higher dry biomass, however, the polymer coated urea application showed no effect on grain yield in comparison to conventional urea. Increasing side-dressed N levels is the main key factor responsible to improve the double cropped maize yield in tropical Brazilian savanna.
4 citations