Abstract：
:When Arabidopsis seedlings are grown on a hard-agar plate, their primary roots show characteristic spiralling movements, apparent as waves, coils and torsions, together with a slanting toward the right-hand side. All these movements are believed to be the result of three different processes acting on the roots: circumnutation, positive gravitropism and negative thigmotropism. The basic movement of the roots is described as that of a growing right-handed helix, which, because of the root tip hitting the agar plate, is continuously switched from the right-hand to the left-hand of the growth direction, and vice versa. This movement also produces a slanting root-growth direction toward the right-hand because of the incomplete waves made by the right-handed root to the left-hand. By contrast, the torsions seen in the coils and waves are interpreted as artefacts that form as an adaptation of the three-dimensional root helix to the flat two-dimensional agar surface.
journal_name
Trends Plant Scijournal_title
Trends in plant scienceauthors
Migliaccio F,Piconese Sdoi
10.1016/s1360-1385(01)02152-5subject
Has Abstractpub_date
2001-12-01 00:00:00pages
561-5issue
12eissn
1360-1385issn
1878-4372pii
S1360-1385(01)02152-5journal_volume
6pub_type
杂志文章,评审abstract：:Ecological, signaling, metabolic, and chemical processes in plant-microorganism systems and in plant-derived material may link the use of chlorinated pesticides in the environment with plant chloromethane emission. This neglected factor should be taken into account to assess global planetary budgets of chloromethane a...
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