my guess in that herbicides impacting the photosynthetic apparatus would be more likely to induce foliar anthocyanin accumulation compared with herbicides with modes of action unrelated to photosynthesis (like glyphosate). The anthocyanin accumulation is probably an attempt on the part of the plant to screen from excess radiation a damaged photosynthetic apparatus.
Herbicides are members of the group of pesticides; thet are used to kill plants unwanted by the human beings.
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Maybe. Chlorophyll is what colours leaves green, and is what is responsible for photosynthesis. Although leaves may not appear green that may be because another agent (for example, Anthocyanin, a pigment that appears in the sugar of plants) is overpowering the colour of the chlorophyll, but it may still be present in the leaves and therefore these leaves may be undergoing photosynthesis.
To suppress unwanted plants referred to as "weeds".
I believe you are asking if insecticides and herbicides are used as preservatives. If so, the answer is no. Insecticides kill insects that might damage plants. Herbicides are used to kill plants ( usually as a weed control ). Both are NOT good to consume on fruits and vegetables. They are poisons.
A herbicide that only kills certain types of plants as opposed to others. Most selective herbicides kill dicotyledonous plants, and do not affect monocotyledonous plants. See related question
Anthocyanins have many functions in plants. First they are brightly pigmented molecules, used in flowers to attract pollinators. They are also responsible for the color in leaves during autumn. Because they are pigmented, they can act as a plant's "sunscreen" protecting it from bleaching by the sun. Lastly, anthocyanins are powerfulantioxidants, which protect plants from the damage of oxygen radicals.
they are used to kill un wanted plants
Yes, weeds have pigments. Pigmentation perhaps most famously is involved in the different colors of flowers and leaves on plants, be they weeds or not. For example, anthocyanin produces purple-colored petals on native, ornamental, weedy and wild flowers.
there is no phycoerythrin present in plants it is only found in red algae, cyanobacteria, cynelles, cryptomaonads and glaucophytes. so in higher plants must be anthocyanin.