Water relations and nitrogen metabolism in tomato plants.

Abstract

The effect of three substratums in combination with two levels of water supply on some component variables of the water state and biochemical of tomato seedling were studies. The humidity percentage of the substratum evidenced that the biosolids application caused an improvement of its capacity of water retention, with a positive effect in the relative content of water and the foliate water potential, which responded positively to the increment of the humidity level of the substratum, more than, to its chemical characteristics. On the other hand, the activity of the nitrate reductasa enzyme showed a significant increment when the seedling was in state of slight estres and the proline accumulation showed a behavior inversely proportional to the humidity of the substratum and the water state of the vegetable, being bigger in the measure than the humidity percentage of the substratum was smaller.