Information and resources: Resources are consumed or made unavailable when they are used (soil mineral nutrients, soil water, carbon dioxide in the atmosphere, light as a source of energy). Environmental signals and cues can be sources of information (the spectrum of light, metabolites released by other individuals or organisms, temperature fluctuations, speed and direction of change of nutrient concentrations in the soil). For humans food is a resource, and light perceived through our eyes is a source of information.
Sensory ecology: Plants are capable of sensing their physical, chemical and biological environment. They perceive signals containing information. This information is used by plants to adjust growth and morphology, and to trigger development. We are interested not only on the physiology of these processes (how they are implemented in the plant) but in their role in the adaptation and acclimation of individual plants, and especially in their role in plant-plant interactions such as competition and facilitation.
Sensory photobiology: Light is both a source of energy and a source of information for plants. Through photosynthesis plants capture solar energy. This energy is absorbed by chlorophylls and accessory pigments. Through other pigments that are in very small quantities in the plant, small amounts of energy are absorbed. This energy is not important as such but rather as a source of information about the environment. This is “light sensing” like that done by our eyes. This can be thought as a very different kind of vision than ours, but anyway a light sensory mechanism to acquire information about the environment.
Resources: Resources are also strong modulators of plant growth. However, we contend that resource availability and direct effects of stress are not always the main and direct driver of all plant-plant and plant-environment interactions. In fact we think that the acquisition of information, and the “use” of this information to adjust growth, morphology, development, and metabolism, are central to achieving fitness.