Effects of paclobutrazol and fertilizer on the physiology, growth and biomass allocation of three Fraxinus species

Regulating Growth of Betula alnoides Buch. Ham. ex D. Don Seedlings with Combined Application of Paclobutrazol and Gibberellin

“…PBZ application resulted in a significant decrease in seedling height of Betula alnoides in the present study, which was in agreement with Williams [7] study on Fraxinus species. As shown in a study on 30-day-old almond seedlings, the inhibitory effect of PBZ application on height growth appeared since the fourth day after PBZ treatment [21].…”

“…Malagueta [22]. Tanis et al's [7] study on three Fraxinus species showed that compared to the control, aboveground woody biomass of PBZ-treated trees significantly increased for F. americana L., decreased for F. quadrangulata Michx., and did not differ remarkably from each other for F. mandshurica Rupr., and the total biomass of PBZ-treated trees did not differ statistically from that of the control for F. americana and F. quadrangulata, while for F. mandshurica, the total biomass of the PBZ-treated trees was significantly lower than that of the control. It is obvious that the responses of biomass to PBZ application vary from species to species.…”

“…and Pinus nigra Arn. without influence on photosynthesis [6], increase ratio of root in a total biomass of three Fraxinus L. species [7]. Abod and Aminor [8] studied the effects of PBZ on the growth of Shorea leprosula Miq.…”

IMPACT OF PACLOBUTRAZOL ON THE GROWTH AND DEVELOPMENT OF NURSERY GROWN CLONAL OIL PALM (Elaeis guineensis Jacq.)

“…The compound acts by inhibiting the enzymes involved in regulating the first three steps in the terpenoid pathway associated with GA biosynthesis (Chaney, 2004). This is the first report that PBZ can reduce the growth of clonal oil palms, however, it has been reported that this GA biosynthesis inhibitor can act as a growthretardant when applied to date palm (Cohen et al, 2013) and a number of dicot tree species (Tanis et al, 2015). Similar observations have been reported by Wahyuni et al (2011) on the effect of the plant growth retardant on Brunonia and Calandrinia sp.…”

“…Hence, in addition to the reduction in oil palm height, PBZ treatment also affected the stem diameter. A reduction in shoot radial growth of Fraxinus species after PBZ treatment has been previously reported by Tanis et al (2015). Similarly, in linseed (Linum usitatissimum L.), PBZ treatment caused a reduction of stem diameter (Ryan et al, 2011) although Tsegaw et al (2005) found that the chemical made potato plants grow shorter but with thicker stems compared to the control.…”