Year: 2022

LEAF VS SHOOT PHOTORECEPTIVITY. "When either the leaves or the shoot tips of photoperiodically sensitive plants are exposed to different daylengths, flowering depends on the daylength given to the leaves and not to the apex. In several instances, leaves from plants, which have been given a daylength treatment that initiates flowering have been grafted on to plants that have not been exposed to permissive daylengths, with the result being flowering in the receptor plants." https://lnkd.in/d_f7kfY View in LinkedIn

LEAVES DETECT DAYLENGTH. "Daylength therefore is perceived in leaves and results in a localized change in the properties of that leaf. Flowering then occurs as a result of a signal transmitted from the leaves to the apex. The change in the leaf is termed induction, while the response at the apex leading to the initiation of flowering is sometimes called evocation." https://lnkd.in/d_f7kfY View in LinkedIn

LEAF GRAFTS. "From grafting experiments, it is known that in some species, induced leaves are independently capable of generating a flowering stimulus over many days or even weeks while in others, favourable cycles must be continued until the apex has become recognizably floral, indicating the need for a continual supply of a floral stimulus (presumably from the leaf) if flower development is to be sustained." https://lnkd.in/d_f7kfY View in LinkedIn

VASCULARIZED LEAVES. "When leaves taken from an induced plant are grafted on to a receptor plant, promotion of flowering or other responses occurs only when a graft union has developed." https://lnkd.in/d_f7kfY View in LinkedIn

PLANT VASCULAR SYSTEM. "Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants." https://lnkd.in/dAvJk2A View in LinkedIn

XYLEM AND PHLOEM. "An intact and functioning nutrient transport system is a requirement for communication between the sites of perception in the leaves and the sites of response. Daylength response is lost when the pathway is disrupted by removing the source leaf, inhibiting transport by localized heat or cold treatments applied at intermediate points in the transport path or stem girdling." https://lnkd.in/d_f7kfY View in LinkedIn

ACROSS TAXA. "Circadian rhythms (from circa, approximately, and dies, day) have been described in a wide range of organisms ranging from cyanobacteria to mammals and at every level of organization." https://lnkd.in/d_f7kfY View in LinkedIn

COMPETITIVE ADVANTAGE. "In wild type and in long– and short–circadian period mutants of Arabidopsis thaliana, plants with a clock period matched to the environment contain more chlorophyll, fix more carbon, grow faster, and survive better than plants with circadian periods differing from their environment. This explains why plants gain advantage from circadian control." https://lnkd.in/dXGrR6X View in LinkedIn

ENDOGENOUS RHYTHMS. "A second defining attribute of circadian rhythms is that they are endogenously generated and self-sustaining, so they persist under constant environmental conditions, typically constant light (or dark) and constant temperature. Under these controlled conditions, the organism is deprived of external time cues, and the free-running period of ∼24 h is observed." https://lnkd.in/d4JRQbh View in LinkedIn

TEMPERATURE NEUTRALITY. "A third characteristic of all circadian rhythms is temperature compensation; the period remains relatively constant over a range of ambient temperatures. This is thought to be one facet of a general mechanism that buffers the clock against changes in cellular metabolism." https://lnkd.in/d4JRQbh View in LinkedIn