Global change through invasion

Article Abstract:

Human-induced species introduction worldwide should be acknowledged as a significant part of man-made global change and a serious threat to biodiversity. While the biosphere has been largely shaped over the aeons by normal plant and animal invasion, humans have intentionally transported crops and animals to other parts of the globe from the very beginnings of agriculture, which has had beneficial and adverse effects on the receiving region. Today, the level of human-induced species introduction has vastly increased, which is causing drastic changes in the receiving area.

Environmental aspects, Culture, Human-animal relationships, Animal introduction, Plant introduction, Plants and civilization

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Identification and role of adenylyl cyclase in auxin signalling in higher plants

Article Abstract:

Cyclic AMP's significance in higher plants has been doubted as they have low adenylyl cyclase activity and hardly detectable amounts of cAMP. Activation T-DNA tagging was used to create tobacco cell lines than proliferate without the phytohormone auxin in the culture media. Axi 141 isolated a complementary NA encoding adenylyl cylase and sequence analysis showed that the tobacco adenylyl cyclase may be soluble and contains leucine-rich repeats, with similarities to adenylyl cyclase from the Schizosaccharomyces pombe yeast.

Adenylate cyclase

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Plant cyclic AMP comes in from the cold

Article Abstract:

Cyclic AMP is produced by the enzyme adenylyl cyclase and mediates the action of many other growth factors and hormones. There was controversy surrounding initial claims the cAMP is found in plant cells, and over the past 10 years sequences similar to proteins that bind cAMP and control gene expression have appeared in plant libraries. A team has identified adenylyl cyclase in regeneration of tobacco protoplasts, and found that cAMP is part of the auxin signal-transduction chain.

Plants

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