Growth Promotion in Pea Stem Sections. II. By Natural Oils &amp; Isoprenoid Vitamins

Stowe, Bruce B.; Obreiter, Jean B.

doi:10.1104/pp.37.2.158

Cited by 32 publications

(20 citation statements)

References 7 publications

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“…But as we showed earlier, even readily metabolized esters of fatty acids contribute no more than a few per cent to the increased CO. output they initiate (11). Moreover, isoprenoids, which are supposed to enter quite different pathways of metabolism, are comparably effective to these alkane derivatives (20).…”

Section: Resultsmentioning

confidence: 99%

“…These are known to be membrane constituents, include well known animal hormones, and some have linear dimensions exceeding 20 A. Accordingly, three groups selected to represent major chemical types (4) and lengths (25) Figure 1, it can be seen that their over-all dimensions fall within a narrow range.…”

Section: Resultsmentioning

confidence: 99%

“…The activity of some ethers and sulfides as insect juvenile hormone mimics (13) 20 A in length and singly substituted esters and nitriles of similar lengths are highly effective (19,20). Thus, it appears that one end of the molecule must be relatively unencumbered to be functional at the active site.…”

Section: Resultsmentioning

confidence: 99%

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Probing a Membrane Matrix Regulating Hormone Action

Stowe

Dotts

1971

Plant Physiol.

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On the 7th day after soaking, 10-mm sections were cut from the third stem internode immediately below apical hooks which had just reached a 900 angle. Such sections were randomized by floating on water in a large Petri dish and 10 were later added to 20 ml of solution in a 10-cm Petri dish for each test. The sections were incubated in a basal medium composed of 1.5% sucrose, 5 mm KH2PO,, pH 5.5, and 50 jM CoCl, with emulsion stabilizer as noted below. When 1.8 /-M IAA and 0.3 /M GA are added, this medium supports maximal extension of pea stem sections under our conditions. After 20 to 24 hr of slow rotation on a shaker at 25 C in the dark room, the length of the sections was measured to the nearest tenth of a millimeter. Average lengths and standard deviations obtained for each dish were later correctly combined via addition of sum of the squares to obtain the average values in the tables which were usually based on three assays of each substance.Emulsification.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Probing a Membrane Matrix Regulating Hormone Action

Stowe

Dotts

1971

Plant Physiol.

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“…The bioassay used has been described previously (32). Brieflv, 10 mm sections cut from just below the apex of 7 Measuring the sections treated with I again after 16 hr more incubation revealed only a uniform growth increment in all treatments.…”

Section: Methodsmentioning

confidence: 99%

“…All are nonionizable, but contain a polar group such as an ester or hydroxyl moiety. Natural compounds which are physiologically active include such substances as triglycerides, a-tocopherol, vitamin K1, and phytol (32). Representative synthetic substances which also are active in the bioassay include methyl oleate, some Tween detergents, and monoolein (31).…”

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Growth Promotion in Pea Stem Sections. III. By Alkyl Nitriles, Alkyl Acetylenes and Insect Juvenile Hormones

Stowe¹,

Hudson²

1969

Plant Physiol.

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Abstract. C,4, C15, and C16 alkyl nitriles, and C16 and C18 alkyl acetylenes at 10 to 105 micromolar concentrations promote the growth of stem sections from red-light-exposed seedlings of dwarf peas (Pisum sativum L. cv. Progress No. 9). Similar results were obtained with substances active as insect juvenile hormones, namely farnesol, the racemic ethyl ester of 1 of the natural hormones, -and a "synthetic juvenile hormone" mixture, the latter 2 having as high an activity in the pea assay as any lipid reported previously. A sterically nearly idenitical compound, methyl-RS-10,11-epoxyfarnesoate, is a weak insect hormone and did not promote plant growth. Thus activity in peas and in insects is in some cases parallel. Other similarities and some differences are discussed. Peas appear to require molecules longer than 20A, while insect activity is maximal at that length. All active molecules are ineffective in promoting pea stem elongation by themselves, indole acetic acid must also be present. The lipid effect in plants and the juvenile hormone response in insects have much in common and the evidence suggests they could have a similar locus of action in a membrane controlling respiratory function. In this paper, our previous report that palmitonitrile is active in the bioassay is extended to other simple nitriles, and alkyl acetylenes also are shown to be active. In addition, the racemate of the ethyl ester of one of the natural insect juvenile hormones, as well as a synthetic mixture with juvenile hormone activity, are shown to be highly effective in promoting growth of pea stem sections. Materials and MethodsThe bioassay used has been described previously (32). Brieflv, 10 mm sections cut from just below the apex of 7 day old seedlings of dwarf peas (Pisum satizvum L. cv. Progress No. 9) which were grown at 250 under continuous extremely weak red light, are randomized and floated, 10 to a Petri dish, on 20 ml of 1.5 % sucrose solution buffered with 5 mM KH2PO, (pH 5.5)

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Promotion of Plant and Insect Hormone Action by Membrane Matrix Matching Lipids

Stowe

1972

Plant Growth Substances 1970

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Growth Promotion in Pea Stem Sections. II. By Natural Oils & Isoprenoid Vitamins

Cited by 32 publications

References 7 publications

Probing a Membrane Matrix Regulating Hormone Action

Probing a Membrane Matrix Regulating Hormone Action

Growth Promotion in Pea Stem Sections. III. By Alkyl Nitriles, Alkyl Acetylenes and Insect Juvenile Hormones

Promotion of Plant and Insect Hormone Action by Membrane Matrix Matching Lipids

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