Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 21 December 2021 / Approved: 22 December 2021 / Online: 22 December 2021 (11:46:18 CET)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Forests 2022, 13, 183
DOI: 10.3390/f13020183

Abstract

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, characterized 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 either by modulating the physical in vitro environment or by adding specific chemicals to the nutrient medium. Our results show that there are significant differences between the studied genotypes in environmental and hormonal regulation of growth responses. The genotype H275, which responded to darkness with PBZ-inhibitable shoot elongation, was unable to recover its growth after treatment with ABA. In contrast, the genotype IBL 91/78, whose shoot elongation was not affected either by darkness or PBZ treatment, recovered so well after the ABA treatment that, when rooted subsequently, it developed longer shoots and roots than without ABA treatment. Our results indicate that GA catabolism and repressive signaling 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.

Keywords

dark treatment; hybrid poplar; plant hormone; rooting; shoot culture

Subject

BIOLOGY, Forestry

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