Abstract
BackgroundStrigolactones are a new class of plant hormones that play a key role in regulating shoot branching. Studies of branching mutants in Arabidopsis, pea, rice and petunia have identified several key genes involved in strigolactone biosynthesis or signaling pathway. In the model plant Arabidopsis, MORE AXILLARY GROWTH1 (MAX1), MAX2, MAX3 and MAX4 are four founding members of strigolactone pathway genes. However, little is known about the strigolactone pathway genes in the woody perennial plants.Methodology/Principal FindingHere we report the identification of MAX homologues in the woody model plant Populus trichocarpa. We identified the sequence homologues for each MAX protein in P. trichocarpa. Gene expression analysis revealed that Populus MAX paralogous genes are differentially expressed across various tissues and organs. Furthermore, we showed that Populus MAX genes could complement or partially complement the shoot branching phenotypes of the corresponding Arabidopsis max mutants.Conclusion/SignificanceThis study provides genetic evidence that strigolactone pathway genes are likely conserved in the woody perennial plants and lays a foundation for further characterization of strigolactone pathway and its functions in the woody perennial plants.
Highlights
Plant architecture plays a major role in determining photosynthetic light use efficiency and biomass yield
SLs are a new class of plant hormones controlling shoot branching
We report the identification of sequence homologues of four founding members of SL pathway genes, namely MORE AXILLARY GROWTH1 (MAX1), MAX2, MAX3 and MAX4
Summary
Plant architecture plays a major role in determining photosynthetic light use efficiency and biomass yield. One recent breakthrough in the field of plant biology was the discovery of strigolactones (SLs) as a new class of plant hormones controlling shoot branching [1,2]. SLs are viewed as integrative signaling molecules that can couple nutrient availability and microbial symbiosis to the control of plant architecture and productivity. This breakthrough offers a new opportunity to dissect the interaction between plants and their environmental systems and to link this interaction to the control of plant architecture and productivity. Strigolactones are a new class of plant hormones that play a key role in regulating shoot branching. Little is known about the strigolactone pathway genes in the woody perennial plants
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