Phyllotactic Change Induced by Gibberellic Acid in Xanthium Shoot Apices

Maksymowych, Roman; Erickson, Ralph O.

doi:10.2307/2441873

Cited by 41 publications

(33 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus an increase in the length of the first internode was correlated with an increase in the DA, and conversely, a shorter internode was correlated with a reduction in the DA (Schwabe 1984). Interestingly, application of GA3 to Xanthium had no effect on the DA although the rate of radial displacement of leaf primordia was reduced (Maksymowych and Erickson 1977); however, it is unknown how the treatment affected the vertical displacement of the primordia, particularly since the rate of leaf initiation was increased while internode elongation was initially stimulated and later inhibited (Maksymowych et al 1976).…”

Section: Discussionmentioning

confidence: 99%

Gibberellin-induced reorganization of spatial relationships of emerging leaf primordia at the shoot apical meristem in Hedera helix L.

Marc

Hackett

1991

Planta

View full text Add to dashboard Cite

The transition from spiral to distichous leaf arrangement during gibberellic-acid (GA3)-induced rejuvenation in Hedera was studied in detail by scanning electron microscopy of the shoot apical meristem. The transition, which involves the initiation of about 14 new leaf primordia, is accomplished by progressive increments in the divergence angle between the leaf primordia from an initial average value of 138.9 ° until it approaches 180 °. This process is preceded, as well as accompanied, by an increased radial displacement of young leaf primordia away from the apical meristem. Although the width of the leaf primordia also increases, this is unlikely to be a causal factor since it occurs only late in the transition. The size of the primordium-free area of the apical meristem is also unlikely to be involved. Quantitative analysis shows that the divergence angle of consecutive leaf primordia commonly fluctuates between relatively large and small values. Thus the transitional stages form a spirodistichous arrangement in which the divergence angle within each pair of leaves is large relative to that between leaf pairs. The stimulation of the radial displacement of the leaf primordia and the associated phyllotactic transition may involve GA3-induced modification in the spatial organization of cortical microtubules in the apical meristem and related changes in directional cell expansion.

show abstract

Section: Discussionmentioning

confidence: 99%

Gibberellin-induced reorganization of spatial relationships of emerging leaf primordia at the shoot apical meristem in Hedera helix L.

Marc

Hackett

1991

Planta

View full text Add to dashboard Cite

show abstract

“…Specific examples include seed germination (Karssen et al, 1989), stem elongation (Spray et al, 1984;MacMillan and Phinney, 1987;Talon and Zeevaart, 1990), regulation of gene expression in the cereal aleurone layer (Baulcombe and Buffard, 1983;Nolan and Ho, 1988;, and juvenile-to-adult phase transition and phyllotaxis (Maksymowych and Erickson, 1977;Hackett, 1991, 1992). GA-related mutants have been identified in several plant species (Reid, 1986).…”

Section: Introductionmentioning

confidence: 99%

Derivative Alleles of the Arabidopsis Gibberellin-Insensitive (gai) Mutation Confer a Wild-Type Phenotype.

1993

View full text Add to dashboard Cite

The gai mutation of Arabidopsis confers a dwarf phenotype resembling that of mutants defective in gibberellin (GA) biosynthesis. However, gai mutant plants differ from GA biosynthesis mutants because they fail to respond to exogenous GAs and accumulate endogenous GA species to higher (rather than lower) levels than found in wild-type controls. The gai mutation, therefore, identifies a gene that modulates the response of plant cells to GA. We have mapped gai with respect to visible and restriction fragment length polymorphism (RFLP) markers from chromosome 1. To observe the phenotype exhibited by individuals potentially lacking wild-type (GAI) function, we have also isolated novel irradiation-induced derivative alleles of gai. When homozygous, these alleles confer a revertant phenotype that is indistinguishable from the wild type. gai is a semidominant mutation that exerts its effects either because it is a gain-of-function mutation or because it is a loss-of-function or reduced-function mutation. The genetic and physiological properties of the derivative alleles are considered with reference to these alternative modes of dominance of gai. Because these alleles are potential deletion or rearrangement mutations, together with the closely linked RFLP markers identified in the linkage mapping experiments, they provide useful resources for the isolation of the gai locus via a map-based cloning approach.

show abstract

“…Afterwards all plants were grown under the same conditions in continuous white light (see legend to boxes in which dark growth takes place is considerably higher than in the phytotron chamber in spite of aeration. Maksymowych & Erickson (1977) and Erickson & Meicenheimer (1977) in their studies with Xanthium reported a significant difference between the divergence angle of this species and the theoretical Fibonacci angle (137.5 ). The mean divergence angle found in their work (approximately 135 ) agrees well with the assumption of a | phyllotaxis.…”

Section: Resultsmentioning

confidence: 79%

Photomorphogenesis and phyllotaxis during vegetative growth in Sinapis alba and Xanthium strumarium

Barsch-Gollnau

Ritterbusch

Mohr

1980

Plant Cell & Environment

View full text Add to dashboard Cite

show abstract

Phyllotactic Change Induced by Gibberellic Acid in Xanthium Shoot Apices

Cited by 41 publications

References 10 publications

Gibberellin-induced reorganization of spatial relationships of emerging leaf primordia at the shoot apical meristem in Hedera helix L.

Gibberellin-induced reorganization of spatial relationships of emerging leaf primordia at the shoot apical meristem in Hedera helix L.

Derivative Alleles of the Arabidopsis Gibberellin-Insensitive (gai) Mutation Confer a Wild-Type Phenotype.

Photomorphogenesis and phyllotaxis during vegetative growth in Sinapis alba and Xanthium strumarium

Contact Info

Product

Resources

About