Effects of mepiquat chloride on yield and main properties of cottonseed under different plant densities

Abstract

Background: Cottonseed oil and protein content as well as germination traits are major indicators of seed quality. However, the responses of these indicators to plant density and mepiquat chloride (MC) are still uncertain. To investigate plant density and MC effects on cottonseed yield and main quality parameters, we conducted a twoyear field experiment including four plant densities (1.35, 2.55, 3.75 and 4.95 plants•m − 2) and two doses of MC (0 and 135 g•hm − 2) in Dafeng, Jiangsu Province, in 2013 and 2014. Results: The application of MC reduced plant height, fruit branch length and fruiting branch number under different plant densities, resulting in a lower and more compact plant canopy. Cottonseed yield showed a nonlinear increase as plant density increasing and achieved the highest value at 3.75 plants•m − 2 , regardless of MC application. No significant interactions were found between plant density and MC for cottonseed yield and quality parameters. The 100-seed weight, cottonseed oil content and vigor index significantly decreased as plant density increased, while these parameters significantly increased with MC applying under different plant densities. Seed vigor index was positively correlated with 100-seed weight and seed oil content across different plant densities and MC treatments. Conclusions: Thus, application of MC could realize a win-win situation between cottonseed yield and main quality parameters under various densities; and plant density of 3.75 plants•m − 2 combined with 135 g•hm − 2 of MC applying is optimal for high cottonseed yield and quality in this cotton production area.

Generación de tecnologías para incrementar la productividad del algodón Gossypium hirsutum L. en Manabí, Ecuador

“…El factor densidad no marcó diferencias estadísticas significativas en el rendimiento (kg ha -1 ) de algodón en rama (F = 0,64; P > 0,05) (Figura 3). Sin embargo, Zhao et al (2019), manifiestan que el factor manejo del cultivo, incluida la densidad de plantas y el regulador de crecimiento, son estrategias que determinan el rendimiento de la fibra y la calidad de la semilla de algodón. Por su parte Ren et al (2013), afirman que la alta densidad disminuye el rendimiento de fibra.…”

“…Al respecto la rotación con insecticidas botánicos como el nim (Azadirachta indica), resultan ser apropiados dentro de un programa de Manejo integrado de Plagas (Sánchez et al, 2009;Nava et al, 2012), que busca disminuir el impacto sobre el ambiente (Ocampo, 2010;Singh et al, 2014), pudiéndose utilizar con seguridad en el marco de una agricultura sustentable (Pino et al, 2011). Otro aspecto a considerar es la acción del regulador de crecimiento que permite a la planta reasignar recursos hacia las estructuras reproductivas, propiciando menor altura de planta, ramas cortas, mayor captura de luz, que se refleja en una alta tasa de crecimiento del cultivo hacia la formación de fibra (Ren et al, 2013;Zhao et al, 2019).…”

“…El rendimiento y calidad de fibra de algodón está influenciado por aspectos genéticos, manejo del cultivo y condiciones ambientales (Zhao et al, 2019). Una estrategia para incrementar la productividad del cultivo de algodón es el mejoramiento genético, a través del cual se derivan plantas con mayor potencial en aspectos como calidad de fibra, estabilidad fenotípica, arquitectura de planta y adaptación específica a los diferentes ambientes ecológicos de las zonas algodoneras (Burbano-Figueroa et al, 2018).…”

Genome-Wide Analysis of DA1-Like Genes in Gossypium and Functional Characterization of GhDA1-1A Controlling Seed Size

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Effect of Plant Distribution Patterns and Growth Regulators on Morphological, Yield and Technological Characters of Egyptian Cotton

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