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Sean Houtman wrote: There are a number of cases of an animal producing some chemical substance that is deleterious to a plant. Many galls are formed by an insect or other arthropod producing some toxin that the plant deals with by growing tissue around it, thereby protecting and feeding the buggie. I always wonder that crown-gall formation in certain plants can be regarded as cancer of the plant. Can this growth be included in the definition of cancer. There is a local tree which produces edible fruits (Zizyphus species), almost all tree tend to develop tumour-like growth having a different color from the stem, I don't know whether eating fruits of such infected plants is harmless for humans for not? I have not heard of any substance that an animal produces that tends to produce death in the plant. Since most plants don't hunt down and eat animals, there isn't any real advantage for animals to produce a poison that will kill a plant. Sean |
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