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128 M.L. Lanteri et al.<br />

Fig.9.2. NO modulates root architecture. Photographs of tomato seedlings incubated<br />

in water (control), 1 mM of the NO scavenger 2-(4-carboxyphenyl)-4, 4,5,5tetramethylimidazoline-1-oxyl-3-oxide,<br />

potassium salt (–NO) and 200 µM of the NO donor<br />

sodium nitroprusside (+NO) for5days.Bar: 1cm.Insets Representative photographs of<br />

fullyelongatedprimaryrootcells.Bar:50µm<br />

showed that the NO-dependent reduction in primary root length correlates<br />

with an inhibition in root cell elongation (Fig. 9.2, inset).<br />

LRsoriginatefromazonedistaltotheactivelydividingprimaryroot<br />

meristem. Hence, during the initiation of LRs, pericycle cells must dedifferentiate<br />

and reenter the cell cycle. The plant hormone auxin promotes<br />

theG1-to-Sphasetransitionthroughtheexpressionofcellcycleregulatory<br />

genes like cyclins and cyclin-dependent kinases (CDK) in some pericycle

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