Identification of a delayed leaf greening gene from a mutation of pummelo
Delayed greening of young leaves is an unusual phenomenon of plants in nature. Citrus are mostly evergreen tree species. Here, a natural mutant of “Guanxi” pummelo ( Citrus maxima ), which shows yellow leaves at the young stage, was characterized to identify the genes underlying the trait of delayed...
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Veröffentlicht in: | Science China. Life sciences 2021-07, Vol.64 (7), p.1165-1173 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Delayed greening of young leaves is an unusual phenomenon of plants in nature. Citrus are mostly evergreen tree species. Here, a natural mutant of “Guanxi” pummelo (
Citrus maxima
), which shows yellow leaves at the young stage, was characterized to identify the genes underlying the trait of delayed leaf greening in plants. A segregating population with this mutant as the seed parent and a normal genotype as the pollen parent was generated. Two DNA pools respectively from the leaves of segregating seedlings with extreme phenotypes of normal leaf greening and delayed leaf greening were collected for sequencing. Bulked segregant analysis (BSA) and InDel marker analysis demonstrated that the delayed leaf greening trait is governed by a 0.3 Mb candidate region on chromosome 6. Gene expression analysis further identified a key candidate gene (
Citrus Delayed Greening gene 1, CDG1
) in the 0.3 Mb region, which showed significantly differential expression between the genotypes with delayed and normal leaf greening phenotypes. There was a 67 bp InDel region difference in the
CDG1
promoter and the InDel region contains a TATA-box element. Confocal laser-scanning microscopy revealed that the CDG1-GFP fusion protein signals were co-localized with the chloroplast signals in the protoplasts. Overexpression of
CDG1
in tobacco and
Arabidopsis
led to the phenotype of delayed leaf greening. These results suggest that the
CDG1
gene is involved in controlling the delayed leaf greening phenotype with important functions in chloroplast development. |
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ISSN: | 1674-7305 1869-1889 |
DOI: | 10.1007/s11427-020-1790-0 |