The deep-water Avalon biota (about 579 to 565 million years old) is often regarded as the earliest-known fossil assemblage with macroscopic and morphologically complex life forms. It has been proposed that the rise of the Avalon biota was triggered by the oxygenation of mid-Ediacaran deep oceans. Here we report a diverse assemblage of morphologically differentiated benthic macrofossils that were preserved largely in situ as carbonaceous compressions in black shales of the Ediacaran Lantian Formation (southern Anhui Province, South China). The Lantian biota, probably older than and taxonomically distinct from the Avalon biota, suggests that morphological diversification of macroscopic eukaryotes may have occurred in the early Ediacaran Period, perhaps shortly after the Marinoan glaciation, and that the redox history of Ediacaran oceans was more complex than previously thought.

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SignificanceCotton is an important crop, and terpenoids form the largest group of natural products. Gossypol and related sesquiterpene aldehydes in cotton function as phytoalexins against pathogens and pests but pose human health concerns, as cotton oil is still widely used as vegetable oil. We report the isolation and identification of four enzymes and the recharacterization of one previously reported P450. We are now close to the completion of the gossypol pathway, an important progress in agricultural and plant sciences, and the data are beneficial to improving food safety. Among the six compounds (intermediates) isolated following gene silencing, one affected plant disease resistance significantly. Thus, these “hidden natural products” harbor interesting biological activities worthy of exploration.