Next Article in Journal
Nitrate Uptake from an Aquifer by Two Plantation Forests: Plausibility Strengthened by Process-Based Modelling
Next Article in Special Issue
Variation of Morphological Traits and Quality Indices of Micropropagated Melia volkensii Gürke Clones before Field Planting
Previous Article in Journal
Identification of Aquaporin Gene Family in Response to Natural Cold Stress in Ligustrum × vicaryi Rehd.
Previous Article in Special Issue
Micropropagation, Characterization, and Conservation of Phytophthora cinnamomi-Tolerant Holm Oak Mature Trees
Article

Differences in Environmental and Hormonal Regulation of Growth Responses in Two Highly Productive Hybrid Populus Genotypes

1
Institute of Forestry, Lithuanian Research Centre for Agriculture and Forestry, Liepų 1, 53101 Girionys, Lithuania
2
Faculty of Natural Sciences, Vytautas Magnus University, Universiteto 10-314, 53361 Akademija, Lithuania
3
Department of Silviculture and Forest Tree Genetics, Forest Research Institute, Braci Leśnej 3, 05-090 Sękocin Stary, Poland
*
Authors to whom correspondence should be addressed.
Academic Editors: Jorge Canhoto, Paloma Moncaleán and Sandra Correia
Forests 2022, 13(2), 183; https://doi.org/10.3390/f13020183
Received: 7 December 2021 / Revised: 11 January 2022 / Accepted: 21 January 2022 / Published: 26 January 2022
(This article belongs to the Special Issue Application of Biotechnology Techniques on Tree Species)
Phenotypic plasticity, in response to adverse conditions, determines plant productivity and survival. The aim of this study was to test if two highly productive Populus genotypes, characterised by different in vitro etiolation patterns, differ also in their responses to hormones gibberellin (GA) and abscisic acid (ABA), and to a GA biosynthesis inhibitor paclobutrazol (PBZ). The experiments on shoot cultures of ‘Hybrida 275′ (abbr. H275; Populus maximowiczii × P. trichocarpa) and IBL 91/78 (Populus tremula × P. alba) were conducted by either modulating the physical in vitro environment or by adding specific chemicals to the nutrient medium. Our results revealed two main sets of differences between the studied genotypes in environmental and hormonal regulation of growth responses. First, the genotype H275 responded to darkness with PBZ-inhibitable shoot elongation; in contrast, the elongation of IBL 91/78 shoots was not affected either by darkness or PBZ treatment. Secondly, the explants of H275 were unable to recover their growth if it was inhibited with ABA; in contrast, those of IBL 91/78 recovered so well after the temporal inhibition by ABA that, when rooted subsequently, they developed longer shoots and roots than without a previous ABA treatment. Our results indicate that GA catabolism and repressive signalling provide an important pathway to control growth and physiological adaptation in response to immediate or impending adverse conditions. These observations can help breeders define robust criteria for identifying genotypes with high resistance and productivity and highlight where genotypes exhibit susceptibility to stress. View Full-Text
Keywords: dark treatment; hybrid poplar; plant hormone; rooting; shoot culture dark treatment; hybrid poplar; plant hormone; rooting; shoot culture
Show Figures

Figure 1

MDPI and ACS Style

Žiauka, J.; Striganavičiūtė, G.; Szyp-Borowska, I.; Kuusienė, S.; Niemczyk, M. Differences in Environmental and Hormonal Regulation of Growth Responses in Two Highly Productive Hybrid Populus Genotypes. Forests 2022, 13, 183. https://doi.org/10.3390/f13020183

AMA Style

Žiauka J, Striganavičiūtė G, Szyp-Borowska I, Kuusienė S, Niemczyk M. Differences in Environmental and Hormonal Regulation of Growth Responses in Two Highly Productive Hybrid Populus Genotypes. Forests. 2022; 13(2):183. https://doi.org/10.3390/f13020183

Chicago/Turabian Style

Žiauka, Jonas, Greta Striganavičiūtė, Iwona Szyp-Borowska, Sigutė Kuusienė, and Marzena Niemczyk. 2022. "Differences in Environmental and Hormonal Regulation of Growth Responses in Two Highly Productive Hybrid Populus Genotypes" Forests 13, no. 2: 183. https://doi.org/10.3390/f13020183

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop