Category: Uncategorized

AUTO-DIGESTION. "Young, actively growing vegetative sinks, and storage organs accumulating reserve proteins, have a rapacious appetite for N. When the demand cannot be met by import from the rhizosphere alone, N is withdrawn from older tissues. In extreme cases – monocarpic reproduction, for example – N remobilization from older tissues can occur on such a scale that the plant ‘self-destructs’." https://lnkd.in/dPac2Jv View in LinkedIn

LIFE AS A SERIES OF COLLABORATIONS. "In each transition, a group of individuals that could previously replicate independently cooperate to form a new, more complex life form. For example, genes cooperated to form genomes, archaea and eubacteria formed eukaryotic cells, and cells cooperated to form multicellular organisms." http://www.pnas.org/content/112/33/10112.full View in LinkedIn

TRANSITIONS. "Twenty years ago, Maynard Smith and Szathmáry revolutionized our understanding of life on earth by showing how the key steps in the evolution of life on earth had been driven by a small number of “major evolutionary transitions.” http://www.pnas.org/content/112/33/10112.full View in LinkedIn

SO ENDS this peek at falling leaves. The numerous variables that plants assess each autumn all go into the calculation of which date to start and to end the process of dropping the leaves. Each plant does its own mathematics. But what really is impressive is that while the dates of start and end vary each year, the species synchronization in that large habitat does not, and the autumnal march is invariably orderly. Not a single research paper can touch this hugely complex subject. View in LinkedIn

CALCULATED VARIABLES. "Leaf senescence is basically governed by the developmental age. However, it is also influenced by various internal and environmental signals that are integrated into the age information." https://lnkd.in/dj6JXRP View in LinkedIn

DATA CONSIDERED. "Leaf senescence initiation is affected by many such factors, such as the age of the plant, plant hormones, ROS, transcription factors, protein kinases, nutrient limitation, and drought." https://lnkd.in/dj6JXRP View in LinkedIn

"LEAF SENESCENCE, involving photosynthesis cessation, degradation of macromolecules, and increase of reactive oxygen species (ROS), as well as contributing to the mobilization of nutrients from old leaves to growing or storage tissues, is regulated by various external and internal factors." https://lnkd.in/dj6JXRP View in LinkedIn

MOBILE GENETIC ELEMENTS. "Various selfish elements parasitize on all cellular life forms. The relative abundances of different classes of viruses are dramatically different between prokaryotes and eukaryotes." https://lnkd.in/dsgDwFC View in LinkedIn

CRITICAL HYPOTHESIS. "Viruses and mobile elements as drivers of evolutionary transitions." https://lnkd.in/dwWBEqU View in LinkedIn

VIRAL ROLE. "A major role of viruses in the host biology has also been demonstrated in prokaryotes as illustrated by gene transduction, in particular the transfer of photosystem genes by cyanophages, the use of defective prophages as vehicles for horizontal gene transfer (HGT) known as gene transfer agents, and more generally by the recruitment of viral genes for diverse host functions." https://lnkd.in/dwWBEqU View in LinkedIn