Application of paclobutrazol affect maize grain yield by regulating root morphological and physiological characteristics under a semi-arid region

Abstract

A field experiment was conducted to investigate the effects of paclobutrazol on ear characteristics and grain yield by regulating root growth and root-bleeding sap of maize crop. Seed-soaking at rate of 0 (CK1), 200 (S1), 300 (S2), and 400 (S3) mg L−1, and seed-dressing at rate of 0 (CK2), 1.5 (D1), 2.5 (D2), and 3.5 (D3) g kg−1 were used. Our results showed that paclobutrazol improved the ear characteristics and grain yield, and were consistently higher than control during 2015–2016. The average grain yield of S1, S2 and S3 were 18.9%, 61.3%, and 45.9% higher, while for D1, D2 and D3 were 20.2%, 33.3%, and 45.2%, compared to CK, respectively. Moreover, paclobutrazol-treated maize had improved root-length density (RLD), root-surface area density (RSD) and root-weight density (RWD) at most of the soil profiles (0–70 cm for seed-soaking, 0–60 cm for seed-dressing) and was attributed to enhancing the grain yield. In addition, root-activity, root-bleeding sap, root dry weight, diameter and root/shoot ratio increased by paclobutrazol, with highest values achieved in S2 and D3 treatments, across the whole growth stages in 2015–2016. Our results suggested that paclobutrazol could efficiently be used to enhance root-physiological and morphological characteristics, resulting in higher grain yield.

Morphology of yellow passion fruit seedlings submitted to triazole induced growth inhibition

“…High PBZ concentrations may inhibit the increase in basal stem diameter (Kamran et al, 2018); notwithstanding, PBZ treatment induced an increase stem diameter (SDM) compared to the control (Figure 3 B).…”

In vitro conservation of Poincianella pyramidalis (Tul.) L.P. Queiroz under minimal growth conditions

“…When added to the culture medium, these carbohydrates reduce the water potential and restrict the water availability to the explants (Shibli et al, 2006;Huang et al, 2014), significantly increasing the in vitro storage time of the tissues (Sharaf et al, 2012). Paclobutrazol (PBZ), a triazole, has been widely used to decrease the height of many plant species, by inhibiting the synthesis of gibberellins (Upreti et al, 2013;Kamran et al, 2018a;Kamran et al, 2018b).…”

Optimization of rhizogenesis for in vitro shoot culture of Pinus massoniana Lamb.

“…Mauriat et al (2011) suggested that the inhibitory effects of GA on AR formation are due to altered IAA transport. Consequently, an inhibitor of GA biosynthesis, paclobutrazol (PBZ), is extensively used to promote root development (Watson 1996(Watson , 2004Salari et al 2017;Kamran et al 2018).…”