Relationship between Shoot Apex and Effect of Gibberellic Acid on Elongation of Pea Stems

Vlitos, A. J.; Meudt, Werner J.

doi:10.1038/180284a0

Cited by 25 publications

(14 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A preliminary report of this work has been presented (12). The results support the views proposed by Vlitos and Meudt (15) and Galston and Warburg (3) that growth stimulation by GA is probably mediated through an auxin-sparing mechanism. Recently Philips and coworkers (7) have presented evidence that GA does not function by an auxin-sparing mechanism but forms a growth-stimulating complex which acts both as an auxin and gibberellin-like compound.…”

supporting

confidence: 81%

“…In order to explain a possible mnechanisnm for GA stimulation of growth, several investigators (1,3,15) have proposed an auxin-sparing mechanism in which a third factor, presumably an IAA oxidlase inhibitor of phenolic nature, is involved. These views are supported by the work reported here, in that dilution of representative enzyme extract from GA treated bud tissues increased the IAA oxidlase activity (fig 1, curve II), by supposedly reducing the level of an inhibitor, which was reported by Tang and Bonner (13).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Gibberellic Acid and Photoperiod on Indoleacetic Acid Oxidase in Lupinus Albus L.

Watanabe

Stutz

1960

Plant Physiol.

View full text Add to dashboard Cite

Recent reports from several laboratories (1,6,8,12) on the effect of gibberellin treatment upon indole-3-acetic acid (IAA) In this paper we have investigated the growth stimulation and IAA oxidase activity in intact lupine plants which had been treated over an extended period with low doses of gibberellic acid (GA) and cultured under two different daylengths. A preliminary report of this work has been presented (12). The results support the views proposed by Vlitos and Meudt (15) and Galston and Warburg (3) that growth stimulation by GA is probably mediated through an auxin-sparing mechanism. Recently Philips and coworkers (7) have presented evidence that GA does not function by an auxin-sparing mechanism but forms a growth-stimulating complex which acts both as an auxin and gibberellin-like compound. It is suggested that had the other investigators (1, 6) assayed tissues which had been treated with GA over a longer period of time that they may have observed a reduction in IAA oxidase activity.

show abstract

supporting

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Effect of Gibberellic Acid and Photoperiod on Indoleacetic Acid Oxidase in Lupinus Albus L.

Watanabe

Stutz

1960

Plant Physiol.

View full text Add to dashboard Cite

show abstract

“…This lack of interaction between GA-and IAA-mediated growth favors the view that these systems are metabolically distinct and possibly entirely unrelated. In contrast with this view are the results of experiments with green pea sections and decapitated etiolated pea plants (2,17) from which it appears that GA-induced growth is synergistic with and possibly completely dependent on an IAA or auxin-induced growth.…”

Section: Klinker J E a Modification Of Thecontrasting

confidence: 43%

An Analysis of Auxin-gibberellin Interaction in Pea Stem Tissue.

Galston¹,

Warburg²

1959

Plant Physiol.

View full text Add to dashboard Cite

“…Many workers have demonstrated a requirement for auxin in the GA3 response of isolated stem sections (1,27,30), and others have postulated a further factor which is required to obtain growth with GA3 in such sections (11,12,25). Recently Shibata et al (28) isolated a cotyledon factor identified as dihydroconiferyl alcohol which restored growth in excised hypocotyl sections of "Great Lakes" variety lettuce seedlings.…”

Section: Discussionmentioning

confidence: 99%

“…Brian and Hemming (1) showed that the growth of segments from dwarf pea stems was much less than that realized by similar regions of whole plants and was not elevated by GA3 application. Furthermore, the GA3 response of many isolated sections has been shown to be dependent on added auxin (1,27,30) or sucrose (24). This paper describes the GA3-induced growth of sections isolated from the hypocotyl of lettuce seedlings.…”

mentioning

confidence: 99%

Gibberellin Response in Lettuce Hypocotyl Sections

Silk¹,

Jones²

1975

Plant Physiol.

View full text Add to dashboard Cite

Excised lettuce (Lactuca sativa L.) hypocotyl sections retain the ability to elongate in response to gibberellic acid (GA3) addition. In 48 hr at 30 C a GA3-treated segment more than doubles while a control segment elongates less than 50%70. Auxin has no detectable effect on this system. Sensitivity to GA3 is not decreased by apex or root removal. Of the experimental variables tested, temperature, sucrose, and preincubation in water affect growth both with and without GA3. Blue and far red light inhibit growth without GAs; this inhibition is reversed by GA3. Potassium chloride stimulates growth of illuminated sections treated with GA3 but has no effect on control growth. When sections are incubated in the dark, KCl has a promotive effect on elongation.There are numerous advantages to using excised plant segments to study the mechanism of hormone action. Interactions, such as transport of hormones and nutrients to the responding segment, are eliminated as variables. The recent advances which have been made in the characterization of the auxin response clearly demonstrate the utility of such isolated segments (4, 5).Research on the mechanism of gibberellin-induced elongation has been hampered by an apparent diminution in ability to respond to GA3 when stem segments are removed from meristematic regions (10). Recently, Kaufman and his colleagues (9,13,14,19) demonstrated a dramatic effect of GA3 on growth of excised stem segments of Avena, but sections from dicotyledonous plants have seemed less responsive. Brian and Hemming (1) showed that the growth of segments from dwarf pea stems was much less than that realized by similar regions of whole plants and was not elevated by GA3 application. Furthermore, the GA3 response of many isolated sections has been shown to be dependent on added auxin (1,27,30) or sucrose (24). This paper describes the GA3-induced growth of sections isolated from the hypocotyl of lettuce seedlings. MATERILS AND METHODSPlant Material. Seeds of lettuce (Lactuca sativa L. cv. Arctic) were obtained from Carter's Ltd., Raynes Park, London. Seeds were imbibed for 2 hr in an excess of distilled H20 and were sown in white light in 9-cm Petri dishes on a circle of Whatman No. 1 filter paper wetted with 5 ml of distilled H20. Germination proceeded in the dark at 25 C for 34 hr after which time the

show abstract

Relationship between Shoot Apex and Effect of Gibberellic Acid on Elongation of Pea Stems

Cited by 25 publications

References 3 publications

Effect of Gibberellic Acid and Photoperiod on Indoleacetic Acid Oxidase in Lupinus Albus L.

Effect of Gibberellic Acid and Photoperiod on Indoleacetic Acid Oxidase in Lupinus Albus L.

An Analysis of Auxin-gibberellin Interaction in Pea Stem Tissue.

Gibberellin Response in Lettuce Hypocotyl Sections

Contact Info

Product

Resources

About