Question

state the function

nucleus in the epidermal root hair cells​

Answer 1

Answer:

In growing Arabidopsis root hairs, the nucleus locates at a fixed distance from the apex, migrates to a random position during growth arrest, and moves from branch to branch in a mutant with branched hairs. Consistently, an artificial increase of the distance between the nucleus and the apex, achieved by entrapment of the nucleus in a laser beam, stops cell growth. Drug studies show that microtubules are not involved in the positioning of the nucleus but that subapical fine F-actin between the nucleus and the hair apex is required to maintain the nuclear position with respect to the growing apex. Injection of an antibody against plant villin, an actin filament-bundling protein, leads to actin filament unbundling and movement of the nucleus closer to the apex. Thus, the bundled actin at the tip side of the nucleus prevents the nucleus from approaching the apex. In addition, we show that the basipetal movement of the nucleus at root hair growth arrest requires protein synthesis and a functional actin cytoskeleton in the root hair tube.

INTRODUCTION

Root hairs are tubular structures that emerge from certain root epidermal cells (Haberlandt, 1883). They expand by localized exocytosis of cell wall matrix contained in Golgi-derived vesicles at the cell apex into a plastic cell wall, a phenomenon referred to as tip growth (reviewed by Derksen and Emons, 1990). During the process of tip growth, a distinct organization of the cell can be observed. The apical area of the root hair is cytoplasm dense with endoplasmic reticulum (ER), Golgi cisternae, and mitochondria, whereas in the extreme apex, a high density of vesicles is present (Emons, 1987; Ridge, 1988; Galway et al., 1997; Miller et al., 2000). Net-axially aligned fine bundles of actin filaments (fine F-actin), which are involved in the delivery of Golgi-derived vesicles to the apex, are present in the subapical area (Miller et al.,

Answer 2

Answer:

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Explanation:

Root hairs are structures that arise from the epidermal cells of the roots of a plant. Their long and thin structure makes them penetrate the soil very easily and their large surface area helps in the maximum absorption of water present in the soil.