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2 edition of occurrence of abscisic acid in the dormant shoots of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] found in the catalog.

occurrence of abscisic acid in the dormant shoots of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco]

John Edinburgh Webber


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Occurrence of abscisic acid in the dormant shoots of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] by John Edinburgh Webber Download PDF EPUB FB2

This is the first reported occurrence of abscisic acid in Douglas-fir. Abscisic acid was quantified in the remaining extracts of the first series. The occurrence of the C2-trans-isomer was not observed in any of the extracts.

In the second series, abscisic acid in the dormant buds, leaves and stems was by: 1. The occurrence of abscisic acid (ABA) in the dormant shoots of Douglas-fir (Pseudotsuga menziesii (Mirb.)Franco) was confirmed by bioassay, thin-layer chromatography, gas–liquid chromatography, and gas–liquid chromatography – mass by: The occurrence of abscisic acid in the dormant shoots of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] By.

Abstract. Graduation date: Methanolic extracts of the dormant Douglas-fir shoots (buds, leaves, and stems) were fractionated by solvent partitioning (sodium bicarbonate-diethyl ether). The acidic portion of the extract was. The occurrence of abscisic acid (ABA) in the dormant shoots of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) was confirmed by bioassay, thin-layer chromatography, gas–liquid chromatography.

Abscisic acid decreases in both the megagametophyte and embryo during moist chilling of Douglas-fir seeds; in the former, ABA declines fourfold during 7 weeks of moist chilling (Corbineau and others ). The longer the duration of moist chilling, the faster the rate of ABA decline during subsequent germination (Corbineau and others ).Cited by:   Breakage of Pseudotsuga menziesii seed dormancy by cold treatment as related to changes in seed ABA induced by abscisic acid is specifically expressed in dormant beechnut seeds.

Plant Physiology. – LoveysBR Metabolism of abscisic acid and the occurrence of epi‐dihydrophaseic acid in Phaseolus vulgaris. Abscisic acid, indoleacetic acid and cyto- Dormant meristems in the shoot are also present in gymnosperms, Lumber and veneer recovery from Douglas-fir (Pseudotsuga menziesii (Mirb.).

Vegetative shoots of coastal Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings rapidly metabolized 1,2[3H]-gibberllin A4 (GA4) to GA2, GA34 and 6 unknown acidie, ethyl acetate-soluble.

Abscisic acid (ABA) and a synthetic analog, the 2-cis acetylenic alcohol, were compared to evaluate their effectiveness in conditioning seedlings of Douglas-fir [Pseudotsuga menziesii. The increase in ABA catabolism (i.e., oxidation or conjugation; 45) is associated with completion of seed dormancy of barley, Pseudotsuga menziesii, Cupressus nootkatensis and yellow-cedar.

47, 93,Thus, mutant seeds deficient in ABA 8′-hydroxilase show increased levels of dormancy. 48 The breaking of dormancy by the most-chilling. In young needles of the Douglas-fir (Pseudotsuga menziesii) GA9 has been shown by GC and HPLC to be the main gibberellin.

As minor compounds GA7, GA3 and GA8 have been tentatively identified by HPLC. In addition to the free gibberellins small amounts of GA9 glucosyl ester and a not yet identified ester of GA20 have been isolated.

From the group of endogenous inhibitors. Title: THE OCCURRENCE OF ABSCISIC ACID IN THE DORMANT SHOOTS OF DOUGLAS-FIR IPseudotsuga menziesii (Mrb Francol Abstract approved: AN ABSTRACT OF THE THESIS OF Signature redacted for privacy.' Murray L.

Layer Signature redacted for privacy. Lavender Methanolic extracts of the dormant Douglas-fir shoots (buds. Lalit M. Srivastava, in Plant Growth and Development: Hormones and Environment, 8.

CHAPTER SUMMARY. Abscisic acid is a sesquiterpene, which has important roles in seed development and maturation, in the synthesis of proteins and compatible osmolytes, which enable plants to tolerate stresses due to environmental or biotic factors, and as a general inhibitor of.

In Douglas fir (Pseudotsuga menziesii) seeds a seven-fold increase in GA activity was measured after 7 weeks stratification, but again this level subsequently declined (Taylor and Wareing, a).

This particular seed lot was only partially dormant showing 44% germination with unstratified seed, increasing to 61% after 7 weeks treatment. Bell, T. A procedure for the purification and quantitation of abscisic acid and its application to a study of abscisic acid concentrations in needles of cold stored Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings.

M.S. thesis, Oregon State Univ., Corvallis. 80 p. Google Scholar. The association between soil and xylem water potential, leaf resistance, and abscisic acid content in droughted seedlings of Douglas-fir (Pseudotsuga menziesii) Physiol.

Plant., 39 (), pp. Changes of abscisic acid content in potato tuber tissues in the period of deep dormancy and during germination. Fiziologiya Raste – [Google Scholar] Koussa T, Broquedis M, Bouard J.

Changes of abscisic acid level during the development of grapevine latent buds, particularly in the phase of dormancy break. Vi 63– Abscisic acid is a single compound unlike the auxins, gibberellins, and cytokinins.

It was called "abscisin II" originally because it was thought to play a major role in abscission of fruits.

At about the same time another group was calling it "dormin" because. Blake J and Ferrell WK () The association between soil and xylem water potential, leaf resistance, and abscisic acid content in droughted seedlings of Douglas-fir (Pseudotsuga menziesii).

Physiol Plant – CrossRef Google Scholar. The regulation of cell-division activity in the vascular cambium and of secondary xylem and phloem development is reviewed for temperate-zone tree species in relation to auxins, gibberellins, abscisic acid, cytokinins, and ethylene.

Representatives of the first four of these PGR classes (IAA, GA1, GA4, GA7, GA9, GA20, ABA, Z, ZR, DCA) have been identified. The seeds of many plants show dormancy at harvest, a property that blocks their germination even under favorable conditions.

Dormancy can be affected by several treatments involving hormones, light quality, temperature, or nutrition, and it disappears with time in a process called after-ripening (for review, see Finch-Savage and Leubner-Metzger, ; Finkelstein et al. D. Abscisic Acid and Ethylene. Abscisic acid (5 × 10 −6 M) reduced the formation of flavans by 15 to 20% in a cell-suspension culture of the tea plant (Bagratishvili et al., ).

Ethylene in the form of ethrel (2-chloroethylphosphonic acid) enhanced markedly the formation of flavans but reduced cell growth by nearly 20% (Bagratishvili et.CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Little is known about the levels and physiological role of endogenous abscisic acid (ABA) during after-ripening and germination.

Genetic variants for ABA content were investigated to account for the role of ABA in the persistence of seed dormancy. In this study, genotypic variation in ABA contents at .