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Plant Growth Regulation
Article . 2017 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
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Regulating the regulators: responses of four plant growth regulators during clonal propagation of Lachenalia montana

Authors: Ondřej Novák; Lenka Plačková; Karel Doležal; Johannes Van Staden; Stephen O. Amoo; Mack Moyo; Mack Moyo; +2 Authors

Regulating the regulators: responses of four plant growth regulators during clonal propagation of Lachenalia montana

Abstract

Lachenalia species are endemic southern African plants with narrow geographical distribution, and are well-traded as ornamental plants in the international floriculture industry. In an attempt to have a better understanding of their growth and hormonal physiology, we evaluated the effects of different plant growth regulators (PGRs) during the clonal regeneration of Lachenalia montana. An auxin (α-naphthaleneacetic acid = NAA) and three cytokinin (CK) types (benzyladenine = BA, meta-topolin riboside = mTR and isopentenyladenine = iP), each at three concentrations (1, 5 and 10 µM), were tested and the effect of these PGRs on the accumulation of endogenous CK metabolites was evaluated to provide clues on the observed morphological responses. As the most efficient PGR, 10 µM mTR treatment produced the highest number of shoots (approximately five shoots per explant) while 1 µM BA-treated plants had more bulbs (approximately three bulbs per plantlet). Rooting was generally lower with increasing concentration of PGRs especially with the aromatic-type CKs. Based on the concentrations of endogenous CKs, 10 µM mTR regenerants also had the highest CKs (40 142.5 pmol g−1 DW) which were mainly of the aromatic-type (98%). In terms of the functional role of the CKs, O-glucosides (which are reversible CK storage forms) were the most dominant CK-type in the regenerants from 10 µM mTR treatment. On the other hand, the poor rooting, mostly prominent in regenerants from BA treatments was closely related to the high accumulation of N 9-glucosides (well-known CK metabolites directly involved in rooting inhibition) when compared to regenerants from other treatments. Overall, the current findings provide evidence on the interrelationship existing among the exogenous PGRs, phenotypic responses and the endogenous CKs in the in vitro regenerants.

Keywords

zeatin-type cytokinins, bulb production, endogenous cytokinin, south-africa, organogenesis, in-vitro, Phytohormones, Physiological disorders, Floriculture, adventitious bud formation, biological-activity, meta-Topolin, Ornamentals, cv ronina, biotechnology, Asparagaceae

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
12
Top 10%
Average
Average
Green