Pelo radical: Diferenzas entre revisións
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Liña 14:
== Importancia ==
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They are also directly involved in the formation of [[root nodule]]s in [[Fabaceae|legume]] plants. The root hairs curl around the bacteria which allows for the formation of an infection thread through into the dividing cortical cells to form the nodule.<ref>{{Cite journal|last1=Mergaert|first1=Peter|last2=Uchiumi|first2=Toshiki|last3=Alunni|first3=Benoît|last4=Evanno|first4=Gwénaëlle|last5=Cheron|first5=Angélique|last6=Catrice|first6=Olivier|last7=Mausset|first7=Anne-Elisabeth|last8=Barloy-Hubler|first8=Frédérique|last9=Galibert|first9=Francis|last10=Kondorosi|first10=Adam|last11=Kondorosi|first11=Eva|title=Eukaryotic control on bacterial cell cycle and differentiation in the Rhizobium–legume symbiosis|journal=Proceedings of the National Academy of Sciences|volume=103|issue=13|pages=5230–5235|language=en|doi=10.1073/pnas.0600912103|pmid=16547129|pmc=1458823|date=28 March 2006}}</ref>▼
Os pelos radicais proporcionan maior superficie para a absorción de auga e nutrientes.
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Root hair cells also secrete acid (H<sup>+</sup> from [[malic acid]]) which exchanges and helps solubilize the minerals into ionic form, making the ions easier to absorb.<ref>{{Cite journal|last1=Gerke|first1=Jörg|last2=Römer|first2=Wilhelm|last3=Jungk|first3=Albrecht|title=The excretion of citric and malic acid by proteoid roots ofLupinus albus L.; effects on soil solution concentrations of phosphate, iron, and aluminum in the proteoid rhizosphere in samples of an oxisol and a luvisol|journal=Zeitschrift für Pflanzenernährung und Bodenkunde|volume=157|issue=4|pages=289–294|language=en|doi=10.1002/jpln.19941570408|date=1994}}</ref>▼
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== Supervivencia ==
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Root hair cells can survive for 2 to 3 weeks<ref>{{Cite web|url=https://prezi.com/4piuz-b_6dgs/root-hair-cells/|title=Root hair cells|website=prezi.com|language=en|access-date=2018-10-04}}</ref> and then die off; at the same time, new root hair cells are continually being formed at the tip of the root. This way, the root hair coverage stays the same. When a new root hair cell grows, it excretes a poison so that the other cells in close proximity to it are unable to grow one of these hairs. This ensures equal and efficient distribution of the actual hairs on these cells. {{Citation needed|date=October 2018}}
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