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Kinetin

About: Kinetin is a research topic. Over the lifetime, 7856 publications have been published within this topic receiving 135550 citations. The topic is also known as: Kinetin.


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Journal ArticleDOI
01 Sep 1971-Planta
TL;DR: It is concluded that ABA reduces the number of root nodules/plant by inhibiting the cortical cell divisions required for root nodule formation in Pisum sativum cv.
Abstract: The effect of exogenous abscisic acid (ABA) on root nodule formation in Pisum sativum cv. Alaska was examined. ABA supplied to the roots at 1.9×10-6M reduced the number of nodules/plant 61% without affecting root or shoot growth. The first noticeable inhibition of nodulation occurred at 3.8×10-7M ABA. ABA at a concentration of 1.9×10-6M inhibited neither root hair formation nor infection of root hairs by Rhizobium leguminosarum. Similar numbers of infection threads penetrated the cortex in both control and treated plants. ABA concentrations of 3.8×10-6M had no effect on the doubling time or maximum density of R. leguminosarum in pure cultures. Normal nodule formation involves a polyploid cortical proliferation. This response to rhizobial infection can be imitated by culturing 1-mm pea-root segments on a medium containing 4.7×10-6M kinetin. Under these conditions a highly significant reduction in the number of polyploid mitoses after 72 h is produced by 3.8×10-8M ABA. A maximum inhibition of 68% was found with 3.8×10-6M ABA. A similar range of ABA concentrations also inhibited the cytokinin-induced cell division in soybean callus. It is concluded that ABA reduces the number of root nodules/plant by inhibiting the cortical cell divisions required for root nodule formation.

64 citations

Journal ArticleDOI
TL;DR: Production of adventitious buds in culture of cotyledon explants derived from young seedlings of Douglas fir required both cytokinin and auxin, and BAP was more effective in stimulation of organ formation than 2iP or kinetin.

64 citations

Journal ArticleDOI
TL;DR: The question is open, therefore, as to whether these compounds directly cause cells to become committed to bud formation or simply accentuate the expression of a commitment determined by other factors.
Abstract: Both kinetin and adenine promote bud initiation in excised cotyledoins of Lactuca sativa. Controls lacking these substances form abundant roots but have never formed buds. Indoleacetic acid and certain mineral salts are also necessary for regeneration of shoots. Although bud growth from cotyledons is extensive on a medium containing both indoleacetic acid and kinetin, excised roots display a low propensity toward bud formation and typically develop callus tissue with roots. Growth of hypocotyl sections is intermediate with respect to bud formation. Shoot initiation in lettuce thus varies with the region of the seedling as well as with the culture medium. BOTH KINETIN (6-furfurylaminopurine) and adenine (6-aminopurine) promote formation of adventitious buds in several plant species. All such species, however, produce some buds even without added kinetin or adenine (see review, Dore, 1965). The question is open, therefore, as to whether these compounds directly cause cells to become committed to bud formation or simply accentuate the expression of a commitment determined by other factors. Our studies of bud formation in Lactuca sativa bear on this question. LaRue (1933, 1936) failed to obtain any shoot formation from leaves of L. sattiva and L. canadensis. We obtain such formatioin only when adenine or kinetin is present.

64 citations

Journal ArticleDOI
TL;DR: Germination of the polymorphic seeds and seedling growth of Atriplex triangularis under various salinity, gibberellic acid and kinetin treatments were determined.
Abstract: Germination of the polymorphic seeds and seedling growth of Atriplex triangularis under various salinity, gibberellic acid and kinetin treatments were determined. Gibberellic acid (GA3; 2.9 mM) promoted germination and growth at high NaCl concentrations (345 mM). Kinetin (4.7 μM) stimulated germination at all salinities and seed sizes tested. GA3 and kinetin generally increased seedling growth at all concentrations of salinity studied. Higher concentrations of kinetin were found to be inhibitory.

64 citations

Journal ArticleDOI
TL;DR: RAPD and mtDNA analysis of all resultant PLBs, callus or plants showed them to be genetically identical, with comparable chlorophyll contents, despite the detection of cytological variation between different plant parts, little variation resulted from abiotic factor treatment.

64 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023115
2022243
2021139
2020137
2019156
2018189