Effects of Several Plant Growth Regulators on the Yield and Fiber Quality of Cotton (Gossypium hirsutum L.)

Toprak Gübre ve Su Kaynakları Merkez Araştırma Enstitüsü, Engüri, Ankara, Turkey
Notulae Botanicae Horti Agrobotanici Cluj-Napoca (Impact Factor: 0.55). 07/2010; 38(3):104-110.
Source: DOAJ


Plant growth regulators (PGR) are used in cotton (Gossypium hirsutum L.) production to balance vegetative and reproductive growth, as well as to increase seed cotton yield and lint quality. Field experiments were conducted with some PGRs to determine their effects on yield and yield components of cotton cultivar Stoneville 453. The study was conducted in 2004 and 2005 at the Agricultural Research and Application Centre of Harran University located in Şanlıurfa, Turkey. During the study, seven commercial PGRs (MC, NAP, BIGIB, KH, MCROP and BIGIBER) were sprayed at recommended doses and appropriate application periods. Experiments were arranged as randomized complete block design with three replications. Experimental plots consisted of six rows, each having 12 m length, row spacing was 0.70 and intra-row spacing was 0.20 m. The results showed that PGRs (except PC) had statistically significant positive effects on the seed cotton yield, plant height, number of open boll, number of sympodia, boll weight, lint percentage and seed index and that they decreased the earliness index. However, fibre length, fibre fineness, fibre strength and fibre uniformity were not affected by the applications. Higher yields were obtained in MCROP, BIGIB and BIGIBER treated plots. Therefore, PGRs might be considered a component of cotton growth management, which is effective on providing higher seed cotton yields.

  • Source
    • "The application of these hormones in low concentration regulates growth, differentiation and development, either by promotion or inhibition (Naeem et al. 2004), and allows physiological processes to occur at their normal rate (Gulluoglu 2004). Major plant growth regulators (PGRs) significantly enhanced fiber yield in cotton (Copur et al. 2010), protein content in pea (Bora and Sarma 2006), chemical constituents in Croton (Soad et al. 2010), fruit size in Molina (Vwioko and Longe 2009), seed germination rate in black gram and horse gram (Chauhan et al. 2009b), floral buds in Jojoba (Prat et al. 2008) and other growth parameters in different plants. Thus, to overcome the production constraints, chemical manipulation could be done to improve yield and growth parameters. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The commercial importance of linseed (Linum usitatissimum L.) has attracted breeders to increase its seed yield using various breeding approaches. Plant growth regulators (PGRs) have a significant role in enhancing yield and its related traits in linseed. In the present study, two plant growth hormones, auxin and gibberellic acid, were applied individually, as well as in combinations, in order to study their effect on yield and its components in "Neelam", which is a high yielding variety of linseed. A comparative study was done under pot and field condition. A combined dose of auxin (1.0 mg L-1) and gibberellin (200 mg L-1) is recommended for the enhancement of seed yield, whereas a 0.5 mg L-1 dose of auxin is recommended for the enhancement of vegetative growth. It was concluded that the plant growth regulators can be successfully employed to enhance the yield in this economically important oil seed crop.
    Full-text · Article · Jul 2013