Subject:
CBSE BOARD XAuthor:
remediosCreated:
1 year agoAnswer:
The inhibitors are used to keep plants a desired size and shape and control fruit formation.
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shellywz2i
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The photosynthesis inhibitors include these herbicide families:
Triazine
Triazinone
Phenylurea
Benzothiadiazole
Nitrile
Phenyl-carbamate
Photosynthesis inhibitors disrupt the photosynthetic (food producing) process in susceptible plants by binding to specific sites within the photosystem II complex in plant chloroplasts. Inhibition of photosynthesis could result in slow starvation of the plant; however, in many situations, rapid death occurs perhaps from the production of secondary toxic substances.
Injury symptoms include interveinal yellowing (chlorosis) and death (necrosis) of leaf tissue beginning at the leaf margins and progressing toward the center of leaves.
The triazines, triazinones, phenylureas and uracils are taken up into the plant via the roots or foliage and move in the xylem to plant leaves. As a result, injury symptoms first will appear on the older leaves, along the leaf margin.
They also have relatively long persistence in soil.
The benzothiadiazoles and phenyl-carbamates are foliar-applied photosynthetic inhibitors and generally remain in the foliar portions of the treated plant. They are contact herbicides requiring thorough spray coverage of the foliage for good weed control. Movement from the foliage to roots is negligible.
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