Abstract:
:Two 9-cis-epoxycarotenoid dioxygenase (NCED) cDNAs have been cloned from a petal library of Gentiana lutea. Both cDNAs carry a putative transit sequence for chloroplast import and differ mainly in their length and the 5'-flanking regions. GlNCED1 was evolutionary closely related to Arabidopsis thaliana NCED6 whereas GlNCED2 showed highest homology to tomato NCED1 and A. thaliana NCED3. The amounts of GlNCED2 transcript were below Northern detection in G. lutea. In contrast, GlNCED1 was specifically expressed at higher levels in developing flowers when petals start appearing. By genetic engineering of tobacco with coding regions of either gene under a constitutive promoter, their function was further analyzed. Although mRNA of both genes was detectable in the corresponding transgenic plants, a physiological effect was only found for GlNCED1 but not for GlNCED2. In germination experiments of GlNCED1 transgenic lines, delayed radicle formation and cotyledon appearance were observed. However, the transformants exhibited no improved tolerance against desiccation stress. In contrast to other plants with over-expressed NCEDs, prolonged delay of seed germination is the only abscisic-acid-related phenotypic effect in the GlNCED1 transgenic lines.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Zhu C,Kauder F,Römer S,Sandmann Gdoi
10.1016/j.jplph.2006.02.010subject
Has Abstractpub_date
2007-02-01 00:00:00pages
195-204issue
2eissn
0176-1617issn
1618-1328pii
S0176-1617(06)00083-6journal_volume
164pub_type
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