Chlorophyll and carbohydrates in Arachis pintoi plants under influence of water regimes and nitrogen fertilization

Abstract

-In this experiment the chlorophyll and carbohydrate contents of Arachis pintoi were evaluated to verify if the presence of nitrogen in the soil could contribute to the effectiveness of the establishment of this legume. The design was completely randomized, in a 4 × 4 factorial arrangement, with four N rates (0, 40, 80 and 120 kg ha -1 ) and four irrigation levels (25, 50, 75 and 100% of field capacity), with four replications. The biochemical evaluations of chlorophylls a and b and total chlorophyll and total soluble sugars, sucrose and starch were performed. The highest contents of chlorophyll a and b and total chlorophyll in leaves were found at the dose of 120 kg ha -1 . The water regime of 25% of field capacity was responsible for the lowest content of reducing sugars and total soluble sugars in leaves, stolons and roots. In the roots, the sucrose contents were higher in these conditions, which can be associated with a slight tolerance of the plant to water stress. The water deficiency was responsible for the decrease of reducing sugars and total N in the whole plant and positively influenced the levels of chlorophyll and sugars in the stolon, promoting growth, especially of shoots, at the beginning of establishment.

The miRNAome of ramie (Boehmeria nivea L.): identification, expression, and potential roles of novel microRNAs in regulation of cadmium stress response

“…Fresh leaves (0.01–0.02 g) were collected and immediately soaked in 95% ethanol, under dark conditions. The chlorophyll content was determined according to the methods described by Sales et al [21].…”

Effects of Fertilization Ratios on the Growth of Pinto Peanut (Arachis Pintoi) under Drought Stress Conditions

“…Sheng (2013) indicated that the chlorophyll of A. pintoi increased during the early stage of drought stress and then reduced later. In contrast, Sales et al (2013) indicated that drought did not reduce total chlorophyll in the leaves of A. pintoi, which may be explained by the fact that there are fewer green leaves on plants under drought stress. In our experiment, plants under water stress had higher SPAD readings.…”

“…It has been shown that there is a quadratic response of the nitrogen fertilization level on the leaf appearance rate (Sales et al, 2012). In another experiment, Sales et al (2013) indicated a significant effect of water regimes and nitrogen application on the leaf growth and development of A. pintoi. The highest number of green leaves per pot was observed with an application rate of 80 kg ha -1 N under 80% FC.…”

Formulação E Composição De Iogurte Bubalino Bifásico Com Geléia De Graviola E Beterraba

“…Segundo Miranda et al (2008), a capacidade competitiva do amendoim forrageiro é potencializada pela associação com fungos micorrízicos arbusculares, contribuindo para seu crescimento inicial no consórcio em pastagens. Essa associação é importante para acelerar o estabelecimento de A. pintoi que, pelo aumento do conteúdo de clorofila total na parte aérea e de sacarose nas raízes, auxilia sua manutenção durante o período de baixa disponibilidade de água (SALES et al, 2012;2013a;2013b). A capacidade de associação funcional com fungos micorrízicos determina ainda a seleção de cultivares mais produtivas, com alta qualidade nutricional, baixa exigência de fósforo e a melhoria da qualidade biológica do solo (MIRANDA et al, 2010;AZEVEDO et al, 2014).…”