scholarly journals Sites of Action of Plant Growth Retardants on Cholesterol Biosynthesis by Cell-Free Rat Liver .Preparations

1970 ◽  
Vol 23 (5) ◽  
pp. 1115 ◽  
Author(s):  
LG Paleg
Keyword(s):  
Plant Growth ◽  
Rat Liver ◽  
Cholesterol Biosynthesis ◽  
Growth Retardants ◽  
One Step ◽  
Plant Growth Retardants ◽  
Sites Of Action ◽  
Amo 1618

Experiments with cell-free preparations of rat liver indicate that of the plant growth retardants Phosfon B, Phosfon D, B995, COlI, and Amo 1618 all but B995 inhibit at least one step between acetate and mevalonate in cholesterol biosynthesis. The results also demonstrate that all of the retardants, including B995, inhibit at least one step between mevalonate and cholesterol, and that several of them act at different points along this part of the biosynthetic sequence.

scholarly journals Inhibition by Plant Growth Retardants of Cholesterol Biosynthesis in Slices of Rat Liver and Hepatoma

1971 ◽  
Vol 24 (4) ◽  
pp. 1125 ◽  
Author(s):  
L Paleg ◽  
JR Sabine
Keyword(s):  
Plant Growth ◽  
Cholesterol Synthesis ◽  
Cholesterol Biosynthesis ◽  
Normal Liver ◽  
Acid Synthesis ◽  
Growth Retardant ◽  
Growth Retardants ◽  
Host Liver ◽  
Plant Growth Retardants ◽  
Amo 1618

The plant growth retardant Phosfon inhibits cholesterol formation by cell�free preparations of normal liver and the Morris hepatomas 5123C, 7794A, and 9618A. In addition, both Phosfon and Amo 1618 arc active in inhibiting cholesterol synthesis from acetate and mevalonate in slices of host liver and the hepatomas. Fatty acid synthesis from acetate was also reduced in the presence of the retardants.

scholarly journals The Dwarfing Effects of Different Plant Growth Retardants on Magnolia wufengensis L.Y. Ma et L. R. Wang

Forests ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 19
Author(s):  
Xiaodeng Shi ◽  
Siyu Chen ◽  
Zhongkui Jia
Keyword(s):  
Plant Growth ◽  
Soluble Sugar ◽  
Control Group ◽  
Growth Retardants ◽  
Sod Activity ◽  
Node Number ◽  
Plant Growth Retardants ◽  
One Year ◽  
Prohexadione Calcium ◽  
Magnolia Wufengensis

The effects of varieties, concentrations, and number of applications of plant growth retardants (PGRs) on the morphological, physiological, and endogenous hormones of Magnolia wufengensis L.Y. Ma et L. R. Wang were assessed to obtain the most suitable dwarfing protocol for M. wufengensis and to provide theoretical support and technical guidance for the cultivation and promotion of this species. One-year-old M. wufengensis ‘Jiaohong No. 2’ grafted seedlings served as the experimental materials. In the first part of the experiment, three PGRs (uniconazole, paclobutrazol, prohexadione calcium), three concentrations (500, 1000, 1500 ppm), and three applications (one, three, and five applications) were applied in dwarfing experiments to perform L9 (34) orthogonal tests. In the second part of the study, dwarfing experiments were supplemented with different high uniconazole concentrations (0, 1500, 2000, 2500 ppm). Spraying 1500 ppm uniconazole five times achieved the best M. wufengensis dwarfing effect, related indicators of M. wufengensis under this treatment were better than other treatment combinations. Here, M. wufengensis plant height, internode length, scion diameter, and node number were significantly reduced by 56.9%, 62.6%, 72.8%, and 74.4%, respectively, compared with the control group. This treatment increased superoxide dismutase (SOD) activity by 66.0%, peroxidase (POD) activity by 85.0%, soluble protein contents by 43.3%, and soluble sugar contents by 27.6%, and reduced malondialdehyde (MDA) contents by 32.1% in leaves of M. wufengensis compared with the control. The stress resistance of M. wufengensis was enhanced. The treatment also reduced gibberellin (GA3) levels by 73.0%, auxin (IAA) by 58.0%, and zeatin (ZT) by 70.6%, and increased (abscisic acid) ABA by 98.1% in the leaves of M. wufengensis. The uniconazole supplementation experiment also showed that 1500 ppm was the optimal uniconazole concentration. The leaves exhibited abnormalities such as crinkling or adhesion when 2000 or 2500 ppm was applied. Given the importance of morphological indicators and dwarfing for the ornamental value of M. wufengensis, the optimal dwarfing treatment for M. wufengensis was spraying 1500 ppm uniconazole five times.

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