Comparison between Coffea arabica L. ‘Laurina’ and C. arabica ‘Bourbon’ seedlings grown in daylight or darkness for their polysaccharidic cell wall composition and caffeine and chlorogenic acid contents

Abstract

Cell wall polysaccharidic composition changed between cotyledons, hypocotyls and roots. Neither the laurina mutation nor the presence of light had an impact on this composition. Coffea arabica ‘Laurina’, a natural mutant of Coffea arabica ‘Bourbon’ (B), is also known as ‘Bourbon Pointu’ (BP). In seedlings under daylight, the laurina mutation leads to semi-dwarf hypocotyls, but this effect disappears in darkness conditions. The first step of our work was to analyze the impact of the mutation on the monosaccharide cell wall composition in cotyledons, hypocotyls and roots in relation to growth conditions (daylight vs darkness). Secondly, the same type of comparison was carried out for caffeine and chlorogenic acid (CQA) contents. Cell wall polysaccharides (CWP) present in cotyledons, hypocotyls and roots were identified. Neither the laurina mutation nor the growth conditions had an impact on the CWP composition. By contrast, there were marked differences between cotyledons, hypocotyls and roots regarding their CWP composition, CQA and caffeine contents. Lastly, the mutation and the light did not modify the CQA content in the three organs, whereas the mutation, but the light, lowered the caffeine (CAF) content.