期刊
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
卷 539, 期 2, 页码 117-125出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.abb.2013.08.006
关键词
Cucumis melo; Ethyl methanesulfonate; Carotenoid isomerase; Pro-lycopene; Apocarotenoids; Gene expression
资金
- Ministry of Agriculture, Israel [2610776-10]
- 'Center for the Improvement of Cucurbit Fruit Quality', ARO, Israel
In order to broaden the available genetic variation of melon, we developed an ethyl methanesulfonate mutation library in an orange-flesh 'Charentais' type melon line that accumulates beta-carotene. One mutagenized M-2 family segregated for a novel recessive trait, a yellow-orange fruit flesh ('yofl'). HPLC analysis revealed that 'yofl' accumulates pro-lycopene (tetra-cis-lycopene) as its major fruit pigment. The altered carotenoid composition of 'yofl' is associated with a significant change of the fruit aroma since cleavage of beta-carotene yields different apocarotenoids than the cleavage of pro-lycopene. Normally, pro-lycopene is further isomerized by CRTISO (carotenoid isomerase) to yield all-trans-lycopene, which is further cyclized to beta-carotene in melon fruit. Cloning and sequencing of 'yofl' CRTISO identified two mRNA sequences which lead to truncated forms of CRTISO. Sequencing of the genomic CRTISO identified an A-T transversion in which leads to a premature STOP codon. The early carotenoid pathway genes were up regulated in 'yofl' fruit causing accumulation of other intermediates such as phytoene and zeta-carotene. Total carotenoid levels are only slightly increased in the mutant. Mutants accumulating pro-lycopene have been reported in both tomato and watermelon fruits, however, this is the first report of a non-lycopene accumulating fruit showing this phenomenon. (c) 2013 Elsevier Inc. All rights reserved.
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