Month: September 2022

PHYSICAL BARRIER TO LIGHT. "Epicuticular waxes influences leaf reflectance. We analysed the seasonal changes in wax reflectance of Scots pine needles. It tended to decrease with needle age and towards lower positions within the canopy. In addition, we also identified clear seasonal pattern of variation superimposed on the of above-mentioned wax weathering effect." https://lnkd.in/eYuQ_dT View in LinkedIn

MORE BARRIER METHODS. "Plants can also adjust light absorption by modulating leaf reflectance properties. Salt deposits and trichomes (hairs) found on the leaf surface of many plants have been shown to increase the fraction of reflected light." https://lnkd.in/eYuQ_dT View in LinkedIn

WAX SEASONALITY AND AGING. "The optical properties of epicuticular waxes undergo a complex temporal pattern during the lifespan of the needle. We found a seasonal pattern of variation superimposed on that of the natural effect of wax weathering with age, which has important implications." https://lnkd.in/eYuQ_dT View in LinkedIn

PIGMENT BLOCKERS. "Non-photosynthetic pigments within cells, such as anthocyanins and avonoids, can also reduce the amount of light available to photosynthesis. In addition to adjustments in the quantity of absorbed light, plants can also alleviate the problem by regulating the fraction of absorbed excitation energy that is thermally dissipated, via the xanthophyll-cycle reactions and the protonation/de-protonation of specific pigment-binding proteins." https://lnkd.in/eYuQ_dT View in LinkedIn

PINE NEEDLE ADAPTATIONS. "In the long term, leaf-level seasonal changes in chlorophyll contents and sustained forms of non-photochemical quenching modulate light absorption and the fraction of thermal energy dissipation, respectively." https://lnkd.in/eYuQ_dT View in LinkedIn

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METABOLITES VS TRANSCRIPT PROFILES. "Seasonal changes in the metabolite profiles were mainly affected by the needles’ age and acclimation for winter, but changes in transcript profiles were mainly dependent on climatic factors. The relative abundance of most transcripts correlated well with temperature, particularly for genes involved in photosynthesis or winter acclimation. Our results suggest that the environment regulates the transcriptome for fine tuning of the metabolome during development." https://lnkd.in/evt9GfD View in LinkedIn