Abstract：
:Bolting of lettuce is promoted by high temperatures. Gibberellins (GAs) play an important role in the bolting of several plant species, and it has been reported that exogenous GAs induce bolting and early flowering in lettuce. To clarify the role of GAs in this process, we examined the expression of genes involved in GA metabolism (LsGA20ox-1 and -2, LsGA3ox-1 and -2, and LsGA2ox-1 and -2) and endogenous GAs in lettuce stems. Quantitative reverse-transcription PCR indicated that the expression of a GA 3-oxidase gene, LsGA3ox1, is significantly upregulated by high (35/25 degrees C) temperature compared to low (25/15 degrees C) temperature, whereas transcription of the GA 20-oxidase gene, which is upregulated in long-day conditions in arabidopsis and spinach during bolting, is not clearly affected. Quantification of GA by liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) showed that high temperature also upregulates the content of GA(1), a bioactive GA in lettuce. Our results suggest that LsGA3ox1 is a candidate for the gene responsible for the increase in GA(1) during lettuce bolting at high temperatures.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Fukuda M,Matsuo S,Kikuchi K,Mitsuhashi W,Toyomasu T,Honda Idoi
10.1016/j.jplph.2009.06.003subject
Has Abstractpub_date
2009-12-15 00:00:00pages
2077-84issue
18eissn
0176-1617issn
1618-1328pii
S0176-1617(09)00242-9journal_volume
166pub_type
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