Tip Growth and Transition to Secondary Wall Synthesis in Developing Cotton Hairs

Seagull, Robert W.

doi:10.1016/b978-0-12-335845-5.50013-6

Cited by 14 publications

(11 citation statements)

References 58 publications

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“…: 1(510) 642 0404; Fax: 1(510) 642 4995; E-mail: reginamc@nature.berkeley.edu membrane material at the growing end of the cell, as in root hairs and pollen tubes. Diffuse growth involves the deposition of new wall and membrane material along the entire cylindrical surface, as in epidermal and parenchyma cells (Green 1963;Taiz et al 1981;Seagull 1990) (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Organization of cortical microtubules at the plasma membrane in Arabidopsis

Sung

1997

Planta

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To understand the role of microtubules in the regulation of cell elongation, we characterized microtubule patterns in fass, a cell shape mutant of Arabidopsis thaliana (L.) Heynh. Examining microtubule patterns via immunocytochemistry, we found that fass cells were able to organize their microtubules into mitotic spindles and phragmoplasts. During interphase or preprophase, fass cells had cortical microtubules, verified by transmission electron microscopy, but these microtubules were not organized into the cortical array or preprophase band. Using chromatin condensation and tubulin localization on the nuclear envelope as preprophase stage markers, we found that although fass cells lacked the preprophase band and cortical array, their cell division cycle appeared normal. To pinpoint the defect in fass cells, we delineated the sequential events leading to cortical array formation in Arabidopsis cells and found that fass cells initiated and recolonized cortical microtubules in the same manner as wild-type cells, but failed to order them into the cortical array. Taken together, these results suggest fass cells are impaired in a component of the microtubule organizing center(s) required for the proper ordering of cortical microtubules at the plasma membrane.

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Section: Introductionmentioning

confidence: 99%

Organization of cortical microtubules at the plasma membrane in Arabidopsis

Sung

1997

Planta

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“…Cotton fibers are single-cell trichomes that result from elongation of epidermal cells of the ovule. Ultrastructural evidence indicates that elongation occurs by a diffuse growing mechanism (Seagull, 1990;Tiwari and Wilkins, 1995). In elongating fibers a thin primary wall is deposited.…”

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Gene-Specific Changes in α-Tubulin Transcript Accumulation in Developing Cotton Fibers

Whittaker

Triplett

1999

Plant Physiology

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The fibers of cotton (Gossypium hirsutum) are single-cell trichomes that undergo rapid and synchronous elongation. Cortical microtubules provide spatial information necessary for the alignment of cellulose microfibrils that confine and regulate cell elongation. We used gene-specific probes to investigate ␣-tubulin transcript levels in elongating cotton fibers. Two discrete patterns of transcript accumulation were observed. Whereas transcripts of ␣-tubulin genes GhTua2/3 and GhTua4 increased in abundance from 10 to 20 d post anthesis (DPA), GhTua1 and GhTua5 transcripts were abundant only through to 14 DPA, and dropped significantly at 16 DPA with the onset of secondary wall synthesis. This is the first report, to our knowledge, of gene-specific changes in tubulin transcript levels during the development of a terminally differentiated plant cell. The decrease in abundance of GhTua1 and GhTua5 transcripts was correlated with pronounced changes in cell wall structure, suggesting that ␣-tubulin isoforms may be functionally distinct in elongating fiber cells. Although total ␣-tubulin transcript levels were much higher in fiber than several other tissues, including the hypocotyl and pollen, none of the ␣-tubulins was specific to fiber cells.

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“…Fiber growth occurs by intercalation of materials throughout the fiber length and by tip growth (Seagull, 1990a). Solute movement into the fiber cell during cell expansion was shown recently to result from developmentally reversible gating of plasmodesmata (Ruan et al, 2001).…”

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confidence: 99%