The effects of drought stress on the activity of acid phosphatase and its protective enzymes in pigweed leaves

Abstract

A model of drought was created on pigweed and the effects of drought stress on the activity of acid phosphatase and its protective enzymes were examined. The pot-cultured pigweeds were divided into 4 groups (ten plants per group) when they reached 6 leaves. (1) In the control group, the culture media contained 70 -85% of field moisture capacity, (2) In the second group, the mild drought stress group, the culture media contained 50 -60% of field moisture capacity, (3) The moderate drought stress group had a culture media that contained 40 -50% of field moisture capacity; (4) The severe drought stress group culture media contained 30 -40% of field moisture capacity. All through the process of the present study, the pigweed plants were cultured under natural conditions on the rooftop of the laboratory building; though transferred indoor in rainy days to avoid the influence of natural precipitation. The plants were sampled and detected every five days after the administration of drought stress. The results clearly demonstrated that the drought stress significantly enhanced the activity of acid phosphatase, membrane permeability and MDA contents; though the activity of acid phosphatase declined after a certain time of drought stress, the extent of membrane permeability and MDA contents still increased with the time. The membrane permeability and MDA contents were correlated with a correlation coefficient of 0.963, 0.971 and 0.939 under mild, moderate and severe drought stress, respectively. The activity of superoxide dismutase (SOD), peroxide dismutase (POD) and hydrogen peroxidase (CAT) was also enhanced with increase in the intensity of drought stress or the prolongation of drought stress at first and then decreased some time afterwards. It was concluded that drought stress enhanced the activity of acid phosphatase, membrane permeability and MDA in the pigweed plants, which was able to resist a certain drought stress by enhancing the activity of protective enzymes. However, excessive drought stress markedly affected the metabolic systems of enzyme and decreased the activity of enzyme.

Cost-effective cellulase production using Parthenium hysterophorus biomass as an unconventional lignocellulosic substrate

“…Fang et al (2008) have shown the enhancing effect of the lactose on cellulase production by Acremonium cellulolyticus. In a study by Sun et al (2010), Trihoderma species cultivated on apple pomace under SSF conditions produced the highest levels of cellulase when supplemented with lactose. In Acrophialophora nainiana also, the highest CMCase production was induced in the presence of lactose (Barros et al 2010).…”

The effect of methyl salicylate on the induction of direct and indirect plant defense mechanisms in poplar (Populus×euramericana‘Nanlin 895’)

“…Antioxidant enzymes play important roles in adaptation to stress conditions. SOD, POD, and CAT are protective enzymes in plants and they can be affected by light and cold stress (Gechev et al 2003), salinity (Rios-Gonzalez et al 2002;Misra & Gupta 2006), high temperature stress (Ali et al 2005;Almeselmani et al 2006), and drought stress (Sun et al 2010). The coordinated functions of antioxidant enzymes, such as SOD, CAT, and POD, facilitate ROS processing and Table 1.…”

Comparative Analysis of Salinity-Induced Proteomic Changes in Cotton (Gossypium hirsutum L.)

“…Cotton is one of the species with strong salt tolerance and is a pioneering crop in saline land. Previous studies have discussed the effects of salt on photosynthesis [4]- [7], antioxidants [8] [9], seed germination [10] [11], and cellular structure [12]. Moreover, cotton has been found to perceive and respond to various adversities, including salt stress.…”