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Cellulase in the kidney bean seedling.

L N Lewis¹, D E Koehler

¹Department of Plant Sciences, University of California, 92521, Riverside, CA, USA.

|December 10, 2013

Summary

Cellulase activity in Phaseolus vulgaris seedlings was highest in the laminar abscission zone and cotyledon. Ethylene treatment specifically enhanced cellulase in tissues targeted by ethylene signaling.

Area of Science:

Plant Physiology
Biochemistry
Molecular Biology

Background:

Cellulase enzymes play a crucial role in plant cell wall modification and abscission.
Understanding cellulase distribution and regulation is key to deciphering plant developmental processes.

Purpose of the Study:

To investigate the distribution and characteristics of cellulase activity in different tissues of Phaseolus vulgaris L. cv. Red Kidney seedlings.
To determine the effect of ethylene treatment on cellulase activity in various plant tissues.

Main Methods:

Surveyed cellulase activity across multiple tissues of 12-day-old Phaseolus vulgaris seedlings.
Utilized sucrose density gradient centrifugation to analyze membrane-associated cellulase fractions.
Applied 1 M NaCl for complete cellulase extraction and ethylene treatment to assess activity changes.

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Main Results:

Highest total cellulase activity was observed in the laminar abscission zone and cotyledon.
A portion of cellulase was membrane-associated, with a density of 1.16 g/cm³.
Ethylene treatment significantly enhanced cellulase activity in the laminar abscission zone and petiolar pulvinus, and to a lesser extent in the stem.

Conclusions:

Cellulase activity is differentially distributed in Phaseolus vulgaris seedlings, with peak activity in abscission zones and cotyledons.
Ethylene-responsive cellulase activity is localized in tissues known to be targets of ethylene signaling, suggesting a role in ethylene-mediated processes.