Interactions between jasmonates and ethylene in the regulation of
root hair development in Arabidopsis.
Root hair specific EXPANSIN A7 is required for
root hair elongation in Arabidopsis.
Dolan, "Ethylene is a positive regulator of
root hair development in Arabidopsis thaliana," The Plant Journal, vol.
This may be a mutant variety referred to as rhd2 (
root hair defective) mutant spoken of by [15] in their study of failed nodulation in some mutant variety of Arabidopsis.
"It's pretty hard to immediately tell the difference between this tiny threadlike thing and a [plant]
root hair," says millipede expert Paul Marek of East Carolina University in Greenville, N.C.
Phosphorus availability regulates many features of root architecture, including adventitious rooting, aerenchyma formation, basal root elongation, basal root-growth angle, lateral rooting,
root hair density, and
root hair length (Bates and Lynch, 1996; Bonser et al., 1996; Borch et al., 1999; Fan et al., 2003; Liao et al., 2001; Ma et al., 2001a; Miller et al., 2003).
Thus, it would appear that gravitropic responses and chemotropic responses to low and high P status soil influence the architecture of the root system and
root hair development.
Bioassay of the nod factors has shown that nod factors of `restricted' strains do not have the ability to initiate nodulation (
root hair curling) on the mutant plant but do on the wild-type plant.
The team, which also included Yoshihiro Yamamoto, an assistant professor of genetics at the Hyogo College of Medicine, took DNA samples from
root hair cells of 28 koala bears divided among the three subspecies.
In the root nodule associations, reciprocal induction of gene expression by the partners is essential for all phases of nodule morphogenesis and maturation (Niner and Hirsch, 1998); i.e., an already existing, functional
root hair and root cortex are recruited and transformed into the nitrogen-fixing nodule as a direct result of interaction with rhizobia or their secreted gene products.
After a year of treatment, new root samples showed great
root hair development and a significant reduction of phylloxera infestation," said Kunde.
The plants grown in high bulk density soil (1.58 g cm-3) exhibited uneven root surface with invaginations, reduced R and increased F in
root hair zone, compared with plants in low bulk density soil (1.20 g cm-3).
