Progress in Pesticide Neurotoxicity

Pesticides play an important role in development of agricultural in China. Pesticides play a significant role in the effective control of diseases, insects, rodents and weeds, the normal supply of agricultural products to protect human direction, but to bring many negative effects on the safety of human health and the environment. Nervous system is susceptible to pesticides. Many pesticides have neurotoxin effects, could damage including cortex, hippocampus, striatum, including a large number of central nervous system. The paper made a brief overview on the toxicity of pesticides on nervous system research.

Changes in the Endogenous Level of Auxins and Gibberellin-Like Substances in the Shoot Apices of Nitrogen-Deficient Tomato Plants (Lycopersicon esculentum Mill)

Tomato plants were grown at three nitrogen levels: normal supply (control), moderate deficiency (one-eighth the normal supply – 1/8N) and acute deficiency (-N). Plant heights were reduced by 51.4 and 75.7 % respectively at 40 days under the latter two treatments compared with control plants. The biological activity of growth-promoting and growth-inhibiting substances was determined in the shoot apices of the three sets of plants at three stages: 20, 30 and 40 days after sowing. In general, the endogenous auxin was higher in control than in 1/8N and - N plants. The growth inhibitor level was higher in -N plants than in control and 118N plants. Gibberellin activity was less in nitrogen- starved plants than in controls. - N plants exhibited not only loss of gibberellins but an accumulation of inhibitors at the last stage. A negative correlation between growth promotors (auxins and gibberellins) and growth inhibitors was evident. The interaction between auxins, gibberellins and inhibitors is discussed.