Pix Plus and Mepiquat Chloride Effects on Physiology, Growth, and Yield of Field-Grown Cotton

Abstract

An important objective for using plant growth regulators in cotton (Gossypium hirsutum L.) is to balance vegetative and reproductive growth as well as to improve lint yield and fiber quality. Field studies were conducted at two locations (Clarkedale and Fayetteville) in Arkansas in 1997 and 1998 to determine physiologic and yield responses of cotton to foliar applications of mepiquat chloride [N,N-dimethylpiperidinium chloride and inert ingredients] (MC) and Pix Plus [MC + Bacillus cereus]. Compared with the untreated control, application of Pix Plus and MC efficiently reduced plant height, improved leaf CO 2 -exchange rate, and increased leaf starch content. Neither Pix Plus nor MC affected photoassimilate translocation from leaves to 10-to 15-day-old bolls. Pix Plus and MC had very similar effects on plant growth and most physiologic parameters investigated in our studies. There was no difference in lint yield between Pix Plus and mepiquat chloride. However, Pix Plus increased the fraction of fruit dry matter in total dry matter.

Comparative Productivity and Seed Nutrition of Cotton by Plant Growth Regulation under Deficient and Adequate Boron Conditions

“…Likewise, the improvement in seed protein contents by MC application is attributed to its role in protein synthesis, through the enhanced conversion of amino acids into protein (Wang and Chen, 1984). On the other hand, the increase in oil content by MC application may be attributed to improved assimilation and translocation of photosynthates (Zhao and Oosterhuis, 2000;Gwathmey and Clement, 2010). A similar increase in protein and oil contents was reported by Sawan et al (2007).…”

“…It modulates plant architecture by reducing leaf area and internodes length, improves light penetration, exalts boll set at lower sympodial branches and first position bolls, and results in improved yield (Nuti et al, 2006;Mao et al, 2014). Furthermore, it exhilarates leaf Chl, CO 2 exchange rate, photosynthesis and alters source-sink relationship (Zhao and Oosterhuis, 2000;Gwathmey and Clement, 2010;Rosolem et al, 2013). It is known that MC affects cottonseed composition and seed nutrient contents in cotton.…”

Características agronômicas da mandioca relacionadas à interação entre irrigação, épocas de colheita e cloreto de mepiquat

“…Estudos relacionados à aplicação desses reguladores em culturas como algodoeiro demonstram elevação da qualidade e da produtividade (ZHAO; OOSTERHUIS, 2000), controle do crescimento e aumento da produtividade (STEWART et al, 2001), redução do crescimento das plantas proporcionando arquitetura favorável à colheita mecanizada (FERRARI et al, 2008;PETTIGREW;JOHNSON, 2005;MONDINO;PETERLIN, 2002;BILES;COTHREN, 2001;COOK;KENNEDY, 2000;ZHAO;OOSTERHUIS, 2000;REDDY et al, 1990); aumento da produção e maturidade (O'BERRY et al, 2009;IQBAL et al, 2004;NICHOLS et al, 2003) e em cana-de-açúcar favorece aumento no perfilhamento e produção final de colmos (WIEDENFELD, 2003), entretanto há muitas lacunas relativas à constância de comportamento quando a interação com o ambiente é considerada. Para a cultura da mandioca, embora poucos sejam os registros sobre os efeitos desses retardadores, tem sido verificada elevação da produção de raízes tuberosas, do peso de massa seca e fresca, dos teores de amido e do metabolismo dos carboidratos nas raízes (GOMANTHINAYAGAM et al, 2007).…”

Plant growth regulation: a method for fine-tuning mepiquat chloride rates in cotton1

“…In years with a short growing season, mepiquat chloride tends to increase yield (Kerby et al 1986). Otherwise, in a full growing season, the bolls produced at the top may mature, and differences in yield disappear (Zhao & Oosterhuis 2000).…”