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Article

Blue Light Upregulates Auxin Signaling and Stimulates Root Formation in Irregular Rooting of Rosemary Cuttings

1
Department of Horticultural Biotechnology, Institute of Life Sciences & Resources, Kyung Hee University, Yongin 17104, Korea
2
Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 56212, Korea
3
Department of Plant & Environmental New Resources, Institute of Life Sciences & Resources, Kyung Hee University, Yongin 17104, Korea
*
Author to whom correspondence should be addressed.
These authors are equally contributed as the first author.
Academic Editors: Samir C. Debnath and Shri Mohan Jain
Agronomy 2021, 11(9), 1725; https://doi.org/10.3390/agronomy11091725
Received: 8 July 2021 / Revised: 9 August 2021 / Accepted: 26 August 2021 / Published: 28 August 2021
Irregular rooting of rosemary stem cuttings, causing differences in either stem maturation or responses to growth conditions, restricts uniform production. Here, rooting efficiency of apical, middle, and basal cuttings from rosemary stems was evaluated by controlling light conditions to prevent irregular rooting. The types of light applied to the cuttings were natural sunlight (NSL), fluorescent, red, and blue (BL) light. Among these light sources, BL significantly induced root growth of not only basal cuttings, but also apical and middle cuttings, whereas NSL induced poor root formation 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. The overexpression of BL-induced IAA synthetic genes confirmed the rooting patterns. IAA synthetic genes were significantly upregulated by BL in the apical and middle cuttings. Irradiating with 50 μmol photons m−2 s−1 BL resulted in similar root production levels among the cutting positions with high biomass, guaranteeing the successful production of uniform cuttings. Thus, the application of proper high-intensity BL promoted healthy, similar-quality rosemary cuttings among stem cutting positions. View Full-Text
Keywords: blue light; cutting position; IAA synthetic pathway; irregular rooting; light intensity; woody cutting blue light; cutting position; IAA synthetic pathway; irregular rooting; light intensity; woody cutting
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MDPI and ACS Style

Gil, C.-S.; Kwon, S.-J.; Jeong, H.-Y.; Lee, C.; Lee, O.-J.; Eom, S.-H. Blue Light Upregulates Auxin Signaling and Stimulates Root Formation in Irregular Rooting of Rosemary Cuttings. Agronomy 2021, 11, 1725. https://doi.org/10.3390/agronomy11091725

AMA Style

Gil C-S, Kwon S-J, Jeong H-Y, Lee C, Lee O-J, Eom S-H. Blue Light Upregulates Auxin Signaling and Stimulates Root Formation in Irregular Rooting of Rosemary Cuttings. Agronomy. 2021; 11(9):1725. https://doi.org/10.3390/agronomy11091725

Chicago/Turabian Style

Gil, Chan-Saem, Soon-Jae Kwon, Ho-Young Jeong, Chanhui Lee, Oak-Jin Lee, and Seok-Hyun Eom. 2021. "Blue Light Upregulates Auxin Signaling and Stimulates Root Formation in Irregular Rooting of Rosemary Cuttings" Agronomy 11, no. 9: 1725. https://doi.org/10.3390/agronomy11091725

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