A Potent Auxin with Unique Chemical Structure-4-Amino-3,5,6- Trichloropicolinic Acid

Kefford, N. P.; Caso, O. H.

doi:10.1086/336358

Cited by 38 publications

(19 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus overall, a root section appears to have an endogenous auxin concentration inhibitory to bud formation and the reduction of its auxin status with antiauxin treatment produces conditions less inhibitory to bud regeneration. The auxins NAA, 2,4-D, and Picloram (Kefford and Caso 1966), in low concentrations, increased bud numbers on root sections [Figs. 3(b),3(c)] and only as the concentration was increased did inhibition occur.…”

Section: Discussionmentioning

confidence: 99%

Organ Regeneration on Excised Roots of Chondrilla Juncea and Its Chemical Regulation

Kefford¹,

Caso²

1972

Aust. Jnl. Of Bio. Sci.

View full text Add to dashboard Cite

Ab8tractThe effects of endogenous factors (plant age, section length, and section location) and environmental factors (temperature and mineral nutrition) upon organ regeneration on isolated root sections of Ohondrilla juncea L. were used to develop a standard assay system for the study of the chemical regulation of regeneration. Bud and root formation and its polarity in the presence of a variety of regulators alone and in combinations were observed quantitatively. Bud numbers were increased by auxin (low concentrations), cytokinin, and gibberellin treatments. High concentra· tions of auxin inhibited bud formation and this effect was reversed by antiauxin, cytokinin, or gibberellin. Adenine did not counteract auxin· induced bud inhibition but adenine and N·6·benzyladenine did counteract inhibition induced by the purine antagonist 2,6·diaminopurine. Numbers of regenerated roots were increased by auxin treatment and reduced by cytokinin and gibberellin treatment. On control and auxin· treated sections, bud formation was strongly polar and proximal and cytokinin and gibberellin treatments lessened the polarity. Growth retardants inhibited regeneration. Of a number of synthetic auxins tested, 2,4.dichlorophenoxy. acet.O.methylhydroxamic acid and 4·amino.3,5,6.trichloropicolinic acid were the most effective inhibitors of bud formation.Mechanisms for the regulation of regeneration are inferred from the results.

show abstract

Section: Discussionmentioning

confidence: 99%

Organ Regeneration on Excised Roots of Chondrilla Juncea and Its Chemical Regulation

Kefford¹,

Caso²

1972

Aust. Jnl. Of Bio. Sci.

View full text Add to dashboard Cite

show abstract

“…Application of 4-amino-3,5,6-trichloropicolinic acid (picloram) to roots stimulated the production of ethylene in both mesquite [Prosopis juliflora (Swartz) (9,11,12). Crocker later reported that Mimtosa puidica (L.) leaves exposed to 0.5 % carbon monoxide lost the ability to respond…”

mentioning

confidence: 99%

“…Zimmerman and Wilcoxson (19) noted loss of leaf movement in Mimosa puidica L. plants enclosed with tomato plants that had been, treated with indole-3-acetic acid. Picloram has been shown to possess growth regulator and auxin properties (9,11,12). Crocker later reported that Mimtosa puidica (L.) leaves exposed to 0.5 % carbon monoxide lost the ability to respond ologists).…”

mentioning

confidence: 99%

Effects of Picloram and Ethylene on Leaf Movement in Huisache and Mesquite Seedlings

Baur

Morgan

1969

Plant Physiol.

View full text Add to dashboard Cite

show abstract

“…a synthetic growth regulator with a unique chemical structure (3) acts as a potent auxin in a variety of test systems when used at low concentrations (7). Picloram, which has been used extensively as a herbicide in recent years, appears to be absorbed and translocated readily after foliar application (3.4).…”

mentioning

confidence: 99%

“…It is also important to determine whether the capacitv of a substance to be transported in plants in a polar manner is a fundamental propertv of any molecule which exhibits auxin activity. Kefford and Caso (7) have pointed out that picloram pos-esses a chemical structure which is markedly different from that of any other natural or synthetic auxin.…”

mentioning

confidence: 99%

Transport of the Auxin, Picloram, Through Petioles of Bean and Coleus and Stem Sections of Pea

Horton

Fletcher

1968

Plant Physiol.

View full text Add to dashboard Cite

Abstract. The transport of the synthetic auxin, picloram (4-amino-3,5,6-trichloropicolinic acid) was investigated in sections of petioles of Phaseolus vulgaris L. and Coleus blumei Benth. and stems of Pisum sativum L. Transport of 14C-picloram was basipolar in all tissues, although the degree of polarity was dependant on age. The velocity of picloram movement was calculated at between 0.75 and 1.11 mm/hr. The amount moved in a given time, the flux, was dependant on the ooncentration applied and the length of the sections used. Picloram did not appear to be metabolized by the tissues during the transport experiments. When compared to the movement of other growth flegulators, picloram transport bears marked similarities to that of 2,4-dichlorophenoxyacetic acid.

show abstract

A Potent Auxin with Unique Chemical Structure-4-Amino-3,5,6- Trichloropicolinic Acid

Cited by 38 publications

References 4 publications

Organ Regeneration on Excised Roots of Chondrilla Juncea and Its Chemical Regulation

Organ Regeneration on Excised Roots of Chondrilla Juncea and Its Chemical Regulation

Effects of Picloram and Ethylene on Leaf Movement in Huisache and Mesquite Seedlings

Transport of the Auxin, Picloram, Through Petioles of Bean and Coleus and Stem Sections of Pea

Contact Info

Product

Resources

About