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Overexpression of Douglas-Fir <i>LEAFY COTYLEDON1</i> (<i>PmLEC1</i>) in <i>Arabidopsis</i> Induces Embryonic Programs and Embryo-like Structures in the <i>lec1-1</i> Mutant but Not in Wild Type Plants
oleh: Mariana A. Vetrici, Dmytro P. Yevtushenko, Santosh Misra
Format: | Article |
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Diterbitkan: | MDPI AG 2021-07-01 |
Deskripsi
Somatic embryogenesis (SE) is the most promising method for the quick propagation of desirable plant genotypes. However, application of SE to conifers remains challenging due to our limited knowledge about the genes involved in embryogenesis and the processes that lead to somatic embryo formation. Douglas-fir, an economically important lumber species, possesses a homolog of the angiosperm embryo-regulatory <i>LEC1</i> gene. In the present study, we analyzed the potential of Douglas-fir <i>PmLEC1</i> to induce embryonic programs in the vegetative cells of a heterologous host, <i>Arabidopsis thaliana</i>. <i>PmLEC1</i> complemented the <i>Arabidopsis lec1-1</i> null mutant and led to a variety of phenotypes ranging from normal morphology to developmental arrest at various stages in the T1 generation. <i>PmLEC1</i> did not affect the morphology of wild type <i>Arabidopsis</i> T1 plants. More profound results occurred in T2 generations. <i>PmLEC1</i> expression induced formation of recurrent somatic embryo-like structures in vegetative tissues of the rescued <i>lec1-1</i> mutant but loss of apical dominance (bushy phenotype) in wild type plants. The activation of embryonic programs in the <i>lec1-1<sup>PmLEC1</sup></i> T2 plants was confirmed by the presence of the embryo-specific transcripts, <i>OLEOSIN</i> and <i>CRUCIFERIN</i>. In contrast, no embryo-like structures, and no <i>OLEOSIN</i> or <i>CRUCIFERIN</i> were observed in <i>PmLEC1</i>-expressing bushy wild type T2 plants.