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Arabidopsis cryptochrome-1 restrains lateral roots growth by inhibiting auxin transport.

Abstract：

:Cryptochromes are blue-light photoreceptors that control many aspects of plant development. In this study, cryptochrome mutants of Arabidopsis were examined to assess the role of cryptchrome-1 (CRY1) in lateral roots growth. When grown in blue light for 12d, mutant seedlings (cry1) showed increased growth of lateral roots, while CRY1-overexpressing transgenic seedlings (CRY1ox) exhibited a marked decrease. Lateral roots growth of CRY1ox could be stimulated by auxin, but expression of PIN1 (efflux carrier of polar auxin transport) was strongly reduced. Contrary, the cry1 mutation showed the opposite effect, indicating that blue light and the auxin-signaling pathway interact in lateral roots growth of Arabidopsis. The free IAA content in CRY1ox roots was half of that in wild type and cry1 mutant roots. Moreover, the content of flavonoids (quercetin, kaempferol, isorhamnetin), which act as endogenous negative regulators of auxin transport, increased in CRY1ox seedlings. Taken together, these results suggest that Arabidopsis CRY1 restrains lateral roots growth by inhibiting auxin transport.

journal_name

J Plant Physiol

journal_title

Journal of plant physiology

authors

Zeng J,Wang Q,Lin J,Deng K,Zhao X,Tang D,Liu X

doi

10.1016/j.jplph.2009.12.003

subject

Has Abstract

pub_date

2010-05-15 00:00:00

pages

670-3

issue

8

eissn

0176-1617

issn

1618-1328

pii

S0176-1617(10)00002-7

journal_volume

167

pub_type

杂志文章

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