Examine reveals that irregular rooting of rosemary stem cuttings causes completely different rising circumstances

Research shows that irregular rooting of rosemary stem cuttings causes differences in the maturation of the stem or in response to growing conditions and limits steady production.

Here, the rooting efficiency of apical, middle and basal cuttings of rosemary stems was assessed by controlling light conditions to prevent irregular rooting. The types of lights used on the cuttings were natural sunlight (NSL), fluorescent, red, and blue (BL) lights.

Under these light sources, BL significantly induced root growth not only from basal cuttings but also from apical and middle cuttings, while NSL induced poor rooting in apical and middle cuttings. In particular, the roots of apical cuttings exposed to BL grew twice as fast as those exposed to other types of light.

Source: MDPI

Overexpression of BL-induced IAA synthetic genes confirmed the rooting pattern. The synthetic IAA genes were significantly upregulated by BL in the apical and middle cuttings. Irradiation with 50 μmol photons m − 2 s − 1 BL resulted in similar root production levels among the high biomass cuttings positions, which guaranteed the successful production of uniform cuttings.

Thus, application of appropriate high intensity BL promoted healthy rosemary cuttings of similar quality among the stem cutting positions.

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