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Effects of ethylene on the orientation of micro tubules and cellulose micro fibrils of pea pisum sativum cultivar alaska epicotyl cells with poly lamellate cell walls



Effects of ethylene on the orientation of micro tubules and cellulose micro fibrils of pea pisum sativum cultivar alaska epicotyl cells with poly lamellate cell walls



Protoplasma 110(1): 5-14



Following a 5 h ethylene treatment, cortical cells of Pea (P. sativum L. cv. Alaska) epicotyl 3rd internode showed a change in the orientation of microtubules near the plasma membrane and recently-deposited cellulose microfibrils. Control cortical cells had mostly transverse microtubules. The ratio of the average frequency of transverse to longitudinal microtubules was 6.0. After 5 h of ethylene treatment, cortical cells had mostly longitudinal microtubules, with the ratio of transverse to longitudinal microtubules equal to 0.1. Epidermal cells were more variable than cortical cells with regard to the frequency of longitudinal and transverse microtubules. Observation of cortical cell walls in conventionally stained thin sections revealed that recent deposition of microfibrils had been primarily transverse in almost all of the control cortical cells sampled. More than half of the ethylene-treated cortical cells had recent deposition oriented primarily longitudinally. This change in microtubule and microfibril orientation may be early enough to constitute the primary effect of ethylene leading to radial cell expansion.

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Accession: 005302908

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