On the synthesis of gibberellins in roots

Sitton, D.; Richmond, Amos; Vaadia, Yoash

doi:10.1016/s0031-9422(00)86067-7

Cited by 44 publications

(14 citation statements)

References 7 publications

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“…ea Tissues Jones and Phillips (17) presented evidence that root tips are a each of the six site of GA synthesis in sunflowers. Their result was consistent laskla pea seed-with the report by Sitton et al (29) (4,5,8). In the present case, similar correlations can be drawn as they relate to internode elongation and leaf expansion.…”

Section: Resultssupporting

confidence: 93%

Sites of Gibberellin Biosynthesis in Pea Seedlings

Coolbaugh

1985

Plant Physiol.

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ABSTRACIPotential sites of gibberellin biosynthesis in 10-day-old 'Alaska' pea (Pisum sativum L.) seedlings were investigated using a cell-free ezyme system capable of incorporating Cl4C-mevalonic acid into ent-kaurene. In peas, ent-kaurene is assumed to be a committed intermediate in the gibberellin biosynthetic pathway. Comparative results from enzyme assays using extracts from shoot tips, leaf blades, internodes, and root tips indicate that the highest capacity for ent-kaurene (and presumably gibberellin) synthesis is in those tissues with the greatest potential for growth. The highest rates were obtained with extracts prepared from the fifth (youngest) internode, the fourth (youngest) expanded leaf, and the shoot tip itself. This report represents the first direct evidence that the enzymes responsible for early stages in gibberellin biosynthesis occur in internode tissues with potential for rapid elongation.All of these results, however, are based upon relatively indirect measurements of GAs extracted or diffused from tissues or the growth response of plants to applied GAs or growth regulators. The use of a cell-free enzyme system from pea seedling shoot tips which is capable of catalyzing certain key reactions in the GA biosynthetic pathway (Fig. 1

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Section: Resultssupporting

confidence: 93%

Sites of Gibberellin Biosynthesis in Pea Seedlings

Coolbaugh

1985

Plant Physiol.

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“…Free-living bacteria, including Rhizobium, have been shown to produce GA-like substances (1,11,23,25), and gibberellins may also be produced by plant roots (2,9,20).…”

Section: Methodsmentioning

confidence: 99%

Differences in Endogenous Levels of Gibberellin-Like Substances in Nodules of Phaseolus lunatus L. Plants Inoculated with Two Rhizobium Strains

Evensen

Blevins²

1981

Plant Physiol.

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“…This has now been · shown in quite a number of plants of different types (herbs, vines, trees) , e.g. pea, tomato, sunflower, sweet potato, grapevine (Vitis viniJera) , species of birch (Betula pubescens) and maple (Acer pseudoplatanus), and apple (115,159,161,162,(167)(168)(169)(170)(171). In apple trees, xylem sap has also been sucked from .the stem and found to contain GA-like substances (171).…”

Section: Techniques (Diffusion Extraction Assays )mentioning

confidence: 98%