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Root Hair Formation

In some species every or almost every cell of the rhizodermis can develop into a root hair. In many cases, however, root hairs are formed only from quite special cells of the young rhizodermis, the trichoblasts. These trichoblasts arise by unequal cell division a cell of the young rhizoepidermis divides into a larger and a smaller, plasma-rich cell. The fate of the larger cell is varied. It can still divide several times but it is also [Pg.228]


Den Hartog, M., Musgrave, A. and Munnik, T., 2001, Nod factor-induced phosphatidic acid and diacylglycerol pyrophosphatase formation a role for phospholipase C and D in root hair formation. Plant J. 25 55-66. [Pg.226]

Fig. 188. Unequal cell division in root hair formation of Phleum (modified from Torrey 1968). Fig. 188. Unequal cell division in root hair formation of Phleum (modified from Torrey 1968).
In the last 40 years of research on HS biological activity, several aspects have been elucidated. The favorable morphological effects of HS on plants regarding growth enhancement have been demonstrated on several plant species under different study conditions. Besides these observations, effects on morphogenesis have also been demonstrated in terms of (a) the induction of lateral root formation and (b) root hair initiation and development in intact plants and stimulation of root and shoot development in treated cell calluses. [Pg.329]

Hairs That part of the hair that shows above the skin is called the shaft and the remainder is the root. The hair follicle in the dermis has a cluster of cells called the bulb, which is the site of the cell division responsible for hair formation. Nutrition for growth comes from the bloodstream the new cells are pushed upwards and as they die they become keratinized. Keratin... [Pg.260]

It is a general observation that seedlings raised under the influence, for instance, of tetcyclacis or triazoles exhibit a shoot-root-ratio which has shifted in favor of the root. In many cases, root growth is stimulated and longer and thicker main roots can be observed, while the formation of adventitious roots and root hairs is initially inhibited [38]. The formation of an improved root system may be one of the reasons why most of these plants show a better performance at later stages of development. [Pg.613]

Kapulnik Y, Delaux P-M, Resnick N, Mayzlish-Gati E, Winmger S, Bhattacharya C, Sejalon-Delmas N, Combier J-P, Becard G, Belausov E, Beeckman T, Dor E, Hershenhom J, Koltai H (2011) Strigolactones affect lateral root formation and root-hair elongation in Arabidopsis. Planta 233 209-216. doi 10.1007/s00425-010-1310-y... [Pg.3599]

Pan, Z. et al. (2007) Functional characterization of desaturases involved in the formation of the terminal double bond of an unusual 16 3A fatty acid isolated from Sorghum bicolor root hairs. J. Biol. Chem. 282, 4326 335... [Pg.381]

The preceding description of nodule initiation, development, and nitrogen-ase clearly demonstrates that the host contribution to symbiosis can be grouped into several functions, including recognition, root hair invasion, infection thread formation, nodule differentiation (e.g., meristems, vascular elements, sclerenchyma), carbon assimilation, organic acid production, ammonia assimilation, maintenance of low O2 by Lb, separation of bacteroids and host cytoplasm by the PBM, senescence, and possibly suppression of host defense responses required for nodule compatibility and/or effectiveness. [Pg.64]


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