Biology(Plants)

知識就是力量

2009-12-16 6:30 am

We know that plant needs minerals for making proteins, chlorophyll, enzymes, food etc. for itself. However, it also needs zinc, which is a toxic substance. Why does plant require for it?

更新1:

Can plant resist the toxicity of the zinc?

回答 (1)

cHung

2009-12-16 7:38 am

✔ 最佳答案

Zinc is an integral componet of protein ,over 80 zinc-containing proteins have been reported. One of them referred to as 'Zinc Fingers',is actively involved in DNA transcription.This menas protein synthesis requires Zinc .
If the zinc is not available to plants,young and recently matured leaves develop puckering,veinal chlorosis and necrosis.Some plants develop purple pigment.Shoot and root growth is reduced .A high level of P in the substrate induces Zn deficiency. Zn availability is reduced by high pH and bicarbonate(HCO3).

2009-12-16 20:10:41 補充：
Can plant resist the toxicity of the zinc?
The plant can resist the zinc while it is very little.The plants cannot resist the toxicity when there is excess zinc.

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