Pollen Tube and Root-Hair Tip Growth Is Disrupted in a Mutant of Arabidopsis thaliana (original) (raw)

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Department of Biology, University of Michigan, Ann Arbor, Michigan 48109

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Department of Biology, University of Michigan, Ann Arbor, Michigan 48109

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Department of Biology, University of Michigan, Ann Arbor, Michigan 48109

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Department of Biology, University of Michigan, Ann Arbor, Michigan 48109

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Published:

01 November 1993

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J. Schiefelbein, M. Galway, J. Masucci, S. Ford, Pollen Tube and Root-Hair Tip Growth Is Disrupted in a Mutant of Arabidopsis thaliana, Plant Physiology, Volume 103, Issue 3, November 1993, Pages 979–985, https://doi.org/10.1104/pp.103.3.979
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Abstract

The expansion of both root hairs and pollen tubes occurs by a process known as tip growth. In this report, an Arabidopsis thaliana mutant (tip1) is described that displays defects in both root-hair and pollen-tube growth. The root hairs of the tip1 mutant plants are shorter than those of the wild-type plants and branched at their base. The tip1 pollen-tube growth defect was identified by the aberrant segregation ratio of phenotypically normal to mutant seeds in siliques from self-pollinated, heterozygous plants. Homozygous mutant seeds are not randomly distributed in the siliques, comprising only 14.4% of the total seeds, 5.3% of the seeds from the bottom half, and 2.2% of the seeds from the bottom quarter of the heterozygous siliques. Studies of pollen-tube growth in vivo showed that mutant pollen tubes grow more slowly than wild-type pollen through the transmitting tissue of wild-type flowers. Cosegregation studies indicate that the root-hair and pollen-tube defects are caused by the same genetic lesion. Based on these findings, the TIP1 gene is likely to encode a product involved in a fundamental aspect of tip growth in plant cells.

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Copyright © 1993 by American Society of Plant Biologists

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