The inhibition of cell elongation limits expansion of leaf and stem tissues, resulting in reduced leaf area and shorter stem lengths. Mepiquat specifically targets gibberellic acid synthesis and, thereby, inhibits cell expansion. Among important natural plant hormones, gibberellic acid stimulates cell elongation. Through a sophisticated system of synthesis, translocation, and concentration, plant hormones or growth substances are distributed throughout plant tissues at low amounts to inhibit or promote various plant functions. Scientists have known for many years that hormones are intricately involved in plant growth and development. Mepiquat and related products are almost exclusively the PGR used in cotton and, given its long history, Pix is the term routinely mentioned to discuss PGR applications in cotton, despite the fact that there are numerous other branded and generic MC products. Practically, most references to PGR use in cotton involves mepiquat chloride (MC), a compound registered with the Environmental Protection Agency (EPA) in 1980 by BASF with the trade name Pix. Plant growth regulators (PGRs) have been used extensively in cotton for almost 40 years.
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