The effect of paclobutrazol on the growth and uptake of Ca and K by apple seedlings<sup>1</sup>

Swietlik, Dariusz; Miller, Stephen

doi:10.1080/01904168409363302

Cited by 34 publications

(36 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In contrast, fibrous root tissues of paclobutrazol-treated plants contained more starch and soluble sugars, and had lower dark respiration rates than those of control roots (Table 4). As in apple seedlings, reduced dark respiration resuited in less carbohydrate utilization which may partially account for the carbohydrate accumulation in paclobutrazol-treated roots (Steffens et al 1983, Swietlik andMiller 1983). In apple seedlings, treatment with paclobutrazol via the nutrient solution resulted in manyfold increases in total nonstructural carbohydrates in stem and root tissues (Wang et al 1985), indicating a profound effect of this compound on partitioning and utilization of carbon assimilates.…”

Section: A T a F R O M T H I S A N D R E L A T E D S T U D I E S ( mentioning

confidence: 94%

Growth and photosynthesis of sweet orange plants treated with paclobutrazol

Yelenosky

1992

J Plant Growth Regul

View full text Add to dashboard Cite

Abstract. Paclobutrazol [(2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-l-yl)pentan-3-ol], formulated as GFU 265, applied at 100, 250, and 500 mg plant-~ to the soil of container-grown sweet orange [Citrus sinensis (L.) Osbeck cv. Valencia], suppressed plant weight, stem height, leaf size, and total leaf area. At the 500-mg dosage, total plant dry weight was reduced by 61%, stem height by 74%, and both leaf biomass and area by 80%, as compared to control plants. All paclobutrazol dosages induced fibrous root thickening and increased their soluble sugar and starch content. Fresh root biomass was 14 to 40% higher and root:shoot ratios were increased three-to sixfold for treated plants. Paclobutrazol applications of 250 and 500 mg plant-1 reduced leaf photosynthetic rate, ribulose bisphosphate carboxylase activity, total nonstructural carbohydrates, and dark respiration 70 to 80% of the control plants. Reductions of leaf photosynthetic rate, carboxylase activity, and photosynthate by paclobutrazol contributed to biomass reduction in treated sweet orange.Plant growth regulators have potential for manipulating growth of many agricultural crops. In citrus, compounds eliciting responses in tree growth and acclimatization to environmental stresses are of potential importance to commercial growers (Yelenosky 1985). Several plant growth regulators have been examined for their potential for controlling excessive shoot growth and for enhancing cold acclimation in citrus trees (Aron et al. 1985, Krezdorn Mention of a trademark, warranty, proprietary product, or vendor does not constitute a guarantee by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products or vendors that may also be suitable.and Cohen 1962, Lima and Davies 1984, Yelenosky 1985. Such compounds can influence a variety of physiological and biochemical processes; however, there is limited information available on these processes in citrus.The present study was conducted to evaluate the responses of sweet orange plants to paclobutrazol [(2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-l-yl)pentan-3-ol], an inhibitor of gibberellin synthesis. We focus on growth and some critical physiological processes associated with the tolerance of sweet orange to soil-applied paclobutrazol. Reduction of vegetative growth by this compound has been reported in a number of fruit tree species (Davis et al. 1988). Materials and Methods Plant Materials and Growth ConditionsSeeds of sweet orange [Citrus sinensis (L.) Osbeck cv. Valencia] were germinated in 2.5-L plastic pots containing washed sand. Potted plants were grown in a greenhouse, watered daily, and fertilized biweekly with 500 ml of a 1.5% solution of 15-7-7 (N-P-K) liquid fertilizer per pot. During the study period, maximum day and minimum night temperatures inside the greenhouse were 32 and 20~ respectively, and relative humidity fluctuated from 50 (day) to 90% (night). The photosynthetic active radiation (PAR, 400-700 nm) inside the greenhouse was ab...

show abstract

Section: A T a F R O M T H I S A N D R E L A T E D S T U D I E S ( mentioning

confidence: 94%

Growth and photosynthesis of sweet orange plants treated with paclobutrazol

Yelenosky

1992

J Plant Growth Regul

View full text Add to dashboard Cite

show abstract

“…Paclobutrazol retards growth of both monocotyledonous and dicototyledonous plants. It is also reported to increase fruit yield in apples, pears, and several other fruits (6,20,22,(25)(26)(27) (16). Mycelia harvested during the ABAproducing phase were collected, washed twice with sterile H20, and resuspended into 60 ml fresh defined medium diluted 1:5 with 4 g/L added glucose.…”

mentioning

confidence: 99%

Paclobutrazol Inhibits Abscisic Acid Biosynthesis in Cercospora rosicola

Norman¹,

Bennett²,

Poling³

et al. 1986

Plant Physiol.

View full text Add to dashboard Cite

ABSTRACIThree plant growth regulators, paclobutrazol, ancymidol, and decylimidazole, which are putative inhibitors of gibberellin (GA) biosynthesis, were studied to determine their effect on abscisic acid (ABA) biosynthesis in the fungus Cercospora rosicola. All three compounds inhibited ABA biosynthesis, and paclobutrazol was the most effective, inhibiting ABA 33% at 0.1 micromolar concentrations. In studies using (E,E,)-l-"Cq farnesyl pyrophosphate, it was shown that ancymidol blocked biosynthesis prior to farnesyl pyrophosphate (FPP), whereas paclobutrazol and decylimidazole acted after FPP. The three inhibitors did not prevent 4'-oxidation of (2Z,4E)-a-ionylideneacetic acid. C. rosiciola metabolized ancymidol by demethylation to a-cyclopropyl-a-(p-hydroxyphenyl)-5-pyrimidine methyl alcohol. Paclobutrazol was not metabolized by the fungus. Information that these plant growth regulators inhibit ABA as well as GA biosynthesis should prove useful in determining the full range of action of these compounds.

show abstract

“…PBZ increased root diameter in soybean by increasing the size of cortical parenchyma cells (Barnes et al, 1989).The increase in fine root development implies a more favorable root/crown balance and less stress in treated trees. Improved water status has been reported after treatment with PBZ (Swietlik andMiller, 1983 andWarren et al, 1991). Followed by 0.5 mg/l ET that gave 7.44 roots/shoot.…”

Section: Resultsmentioning

confidence: 92%

Effect of Growth Retardants on Shoot and Root Development of Stevia(Steviarebaudiana Bertoni) Plant Grown in Vitro

El-Fadl¹

2017

IOSR JAVS

View full text Add to dashboard Cite

The effect of paclobutrazol on the growth and uptake of Ca and K by apple seedlings¹

Cited by 34 publications

References 5 publications

Growth and photosynthesis of sweet orange plants treated with paclobutrazol

Growth and photosynthesis of sweet orange plants treated with paclobutrazol

Paclobutrazol Inhibits Abscisic Acid Biosynthesis in Cercospora rosicola

Effect of Growth Retardants on Shoot and Root Development of Stevia(Steviarebaudiana Bertoni) Plant Grown in Vitro

Contact Info

Product

Resources

About

The effect of paclobutrazol on the growth and uptake of Ca and K by apple seedlings1

Cited by 34 publications

References 5 publications

Growth and photosynthesis of sweet orange plants treated with paclobutrazol

Growth and photosynthesis of sweet orange plants treated with paclobutrazol

Paclobutrazol Inhibits Abscisic Acid Biosynthesis in Cercospora rosicola

Effect of Growth Retardants on Shoot and Root Development of Stevia(Steviarebaudiana Bertoni) Plant Grown in Vitro

Contact Info

Product

Resources

About

The effect of paclobutrazol on the growth and uptake of Ca and K by apple seedlings¹