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Open AccessArticle

Natural Variation in Adventitious Rooting in the Alpine Perennial Arabis alpina

1
Institute for Plant Sciences, University of Cologne, Zülpicher Str. 47B, 50674 Cologne, Germany
2
Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
3
Cluster of Excellence on Plant Sciences “From Complex Traits towards Synthetic Modules”, 40225 Düsseldorf, Germany
4
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 90736 Umeå, Sweden
*
Author to whom correspondence should be addressed.
Plants 2020, 9(2), 184; https://doi.org/10.3390/plants9020184
Received: 22 November 2019 / Revised: 9 January 2020 / Accepted: 30 January 2020 / Published: 3 February 2020
(This article belongs to the Section Molecular Botany)
Arctic alpine species follow a mixed clonal-sexual reproductive strategy based on the environmental conditions at flowering. Here, we explored the natural variation for adventitious root formation among genotypes of the alpine perennial Arabis alpina that show differences in flowering habit. We scored the presence of adventitious roots on the hypocotyl, main stem and axillary branches on plants growing in a long-day greenhouse. We also assessed natural variation for adventitious rooting in response to foliar auxin spray. In both experimental approaches, we did not detect a correlation between adventitious rooting and flowering habit. In the greenhouse, and without the application of synthetic auxin, the accession Wca showed higher propensity to produce adventitious roots on the main stem compared to the other accessions. The transcript accumulation of the A. alpina homologue of the auxin inducible GH3.3 gene (AaGH3.3) on stems correlated with the adventitious rooting phenotype of Wca. Synthetic auxin, 1-Naphthaleneacetic acid (1-NAA), enhanced the number of plants with adventitious roots on the main stem and axillary branches. A. alpina plants showed an age-, dosage- and genotype-dependent response to 1-NAA. Among the genotypes tested, the accession Dor was insensitive to auxin and Wca responded to auxin on axillary branches. View Full-Text
Keywords: Arabis alpina; alpine; perennial; adventitious rooting; clonal growth; auxin Arabis alpina; alpine; perennial; adventitious rooting; clonal growth; auxin
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MDPI and ACS Style

Mishra, P.; Roggen, A.; Ljung, K.; Albani, M.C. Natural Variation in Adventitious Rooting in the Alpine Perennial Arabis alpina. Plants 2020, 9, 184.

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