What question did this study set out to answer?

Investigate how cortical wall microtubules mediate the contrasting effects of gibberellin and kinetin on stem elongation and lateral expansion in plant tissues.

April 1, 1974Plant and Cell Physiology

Involvement of wall microtubules in gibberllin promotion and kinetin inhibition of stem elongation

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Authors

HSHiroh ShibaokaThe University of Osaka

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Implication

Experimental study reveals microtubule reorientation in azuki bean epicotyl segments, indicating that cytoskeletal alignment directs longitudinal elongation versus lateral expansion.

Key Points

Investigate how cortical wall microtubules mediate the contrasting effects of gibberellin and kinetin on stem elongation and lateral expansion in plant tissues.
Treated light-grown azuki bean (Vigna angularis) epicotyl segments with indoleacetic acid (IAA), kinetin, benzimidazole, gibberellin, and colchicine.
Assessed longitudinal stem elongation, transverse stem thickening, and transverse cell counts to determine patterns of cell expansion.
Used electron microscopy to examine wall microtubule orientation in epicotyl cells across different hormone treatment combinations.
Kinetin and benzimidazole inhibited IAA-induced epicotyl elongation and induced lateral cell expansion without altering transverse cell numbers, a response reversed by colchicine.
Electron microscopy demonstrated that wall microtubules aligned parallel to the cell axis under kinetin plus IAA, whereas they were randomly oriented with IAA alone.
Wall microtubules aligned transverse to the cell axis when treated with gibberellin and IAA, facilitating longitudinal stem elongation.

Cite This Study

Hiroh Shibaoka (1974) studied this question.

synapsesocial.com/papers/6aa61344041e43fea73a6780 https://doi.org/10.1093/oxfordjournals.pcp.a075001

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Implication

Experimental study reveals microtubule reorientation in azuki bean epicotyl segments, indicating that cytoskeletal alignment directs longitudinal elongation versus lateral expansion.

Involvement of wall microtubules in gibberllin promotion and kinetin inhibition of stem elongation

Discussion

Member takes

Implication

Key Points

Cite This Study

Involvement of wall microtubules in gibberllin promotion and kinetin inhibition of stem elongation

Discussion

Member takes

Implication

Key Points

Cite This Study

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