Biotech Updates

Arabidopsis' ACB Proteins Play Roles in Pollen Development

February 25, 2015

In Arabidopsis, six acyl-CoA-binding proteins (ACBPs) function in plant stress responses and development. Three of these AtACBPs (AtACBP4–AtACBP6) are in the cytosol and all are expressed in floral organs. In a recent study, the University of Hongkong's Mee-Len Chye evaluates the roles of cytosolic AtACBPs in floral development.

The knockout mutants of acbp5, acbp4 and acbp6 were first characterized to examine their independent and combinatory functions in floral development. The single mutants did not cause any significant phenotypic changes. However, phenotypic deficiencies affecting siliques and pollen were observed in the double mutants, acbp4acbp6 and acbp5acbp6, as well as the acbp4acbp5acbp6 triple mutant.

Vacuole accumulation in the acbp4acbp6, acbp5acbp6, and acbp4acbp5acbp6 mutants' pollen was the most severe abnormality that occurred. Further analysis revealed exine and oil body defects in the triple mutant, and also exhibited reduced ability in in vitro pollen germination. These results suggest that the three cytosolic AtACBPs play combinatory roles in pollen development.

For more information on the study, read the full article on the Oxford Journals website.