Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets

Brassinosteroids (BRs) comprise a specific class of low-abundance plant steroids of ubiquitous occurrence in plants. Molecular genetic analysis of mutants defective in BRs biosynthesis or response has demonstrated that the ability to synthesize, perceive and respond to BRs is critical for normal pla...

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Autores principales: Pereira-Netto, A.B., Ramírez, J.A., Galagovsky, L.R.
Formato: JOUR
Materias:
28-homocastasterone
Brassinosteroids
Lycopersicum esculentum
Rooting
comparative study
fruit
genetic analysis
morphology
rooting
steroid
water uptake
Lycopersicon esculentum
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03044238_v181_n_p13_PereiraNetto
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03044238_v181_n_p13_PereiraNetto2023-10-03T15:20:54Z Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets Pereira-Netto, A.B. Ramírez, J.A. Galagovsky, L.R. 28-homocastasterone Brassinosteroids Lycopersicum esculentum Rooting comparative study fruit genetic analysis morphology rooting steroid water uptake Lycopersicon esculentum Brassinosteroids (BRs) comprise a specific class of low-abundance plant steroids of ubiquitous occurrence in plants. Molecular genetic analysis of mutants defective in BRs biosynthesis or response has demonstrated that the ability to synthesize, perceive and respond to BRs is critical for normal plant growth. In this work, the structure-activity relationships of two synthetic derivatives of 28-homocastasterone (28-HCS) were evaluated on tomato plantlets using the native 28-HCS and epibrassinolide (epi-BL) as control. Progressive enhancement in the main root elongation was found for plantlets treated with increased doses of 5α-fluoro-28-homocastasterone (5F-HCS) within the 0.5-4μgshoot-1 range. When compared to epi-BL, to the parental 28-HCS and to a mono 5-hydroxy HCS derivative (5OH-HCS), no difference between 5F-HCS and the other BRs, towards stimulation of main root elongation, was found when these BRs were applied at a dose of 2.0μg per plantlet. Both, 5F-HCS and 5OH-HCS significantly enhanced shoot elongation, though significantly less than HCS and epi-BL did. Besides provinding an insight into the morphological responses of tomato plantlets to application of 28-HCS derivatives, these results also demonstrate that the 5F-HCS-induced stimulation of main root elongation might be useful to improve the plants's nutrient and especially water uptake, particularly under water deficit, besides improving anchorage. © 2014. Fil:Ramírez, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03044238_v181_n_p13_PereiraNetto
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 28-homocastasterone
Brassinosteroids
Lycopersicum esculentum
Rooting
comparative study
fruit
genetic analysis
morphology
rooting
steroid
water uptake
Lycopersicon esculentum
spellingShingle 28-homocastasterone
Brassinosteroids
Lycopersicum esculentum
Rooting
comparative study
fruit
genetic analysis
morphology
rooting
steroid
water uptake
Lycopersicon esculentum
Pereira-Netto, A.B.
Ramírez, J.A.
Galagovsky, L.R.
Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets
topic_facet 28-homocastasterone
Brassinosteroids
Lycopersicum esculentum
Rooting
comparative study
fruit
genetic analysis
morphology
rooting
steroid
water uptake
Lycopersicon esculentum
description Brassinosteroids (BRs) comprise a specific class of low-abundance plant steroids of ubiquitous occurrence in plants. Molecular genetic analysis of mutants defective in BRs biosynthesis or response has demonstrated that the ability to synthesize, perceive and respond to BRs is critical for normal plant growth. In this work, the structure-activity relationships of two synthetic derivatives of 28-homocastasterone (28-HCS) were evaluated on tomato plantlets using the native 28-HCS and epibrassinolide (epi-BL) as control. Progressive enhancement in the main root elongation was found for plantlets treated with increased doses of 5α-fluoro-28-homocastasterone (5F-HCS) within the 0.5-4μgshoot-1 range. When compared to epi-BL, to the parental 28-HCS and to a mono 5-hydroxy HCS derivative (5OH-HCS), no difference between 5F-HCS and the other BRs, towards stimulation of main root elongation, was found when these BRs were applied at a dose of 2.0μg per plantlet. Both, 5F-HCS and 5OH-HCS significantly enhanced shoot elongation, though significantly less than HCS and epi-BL did. Besides provinding an insight into the morphological responses of tomato plantlets to application of 28-HCS derivatives, these results also demonstrate that the 5F-HCS-induced stimulation of main root elongation might be useful to improve the plants's nutrient and especially water uptake, particularly under water deficit, besides improving anchorage. © 2014.
format JOUR
author Pereira-Netto, A.B.
Ramírez, J.A.
Galagovsky, L.R.
author_facet Pereira-Netto, A.B.
Ramírez, J.A.
Galagovsky, L.R.
author_sort Pereira-Netto, A.B.
title Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets
title_short Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets
title_full Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets
title_fullStr Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets
title_full_unstemmed Comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets
title_sort comparative analysis of the effects of homocastasterone and two derivatives on shoot and main root elongation of tomato plantlets
url http://hdl.handle.net/20.500.12110/paper_03044238_v181_n_p13_PereiraNetto
work_keys_str_mv AT pereiranettoab comparativeanalysisoftheeffectsofhomocastasteroneandtwoderivativesonshootandmainrootelongationoftomatoplantlets
AT ramirezja comparativeanalysisoftheeffectsofhomocastasteroneandtwoderivativesonshootandmainrootelongationoftomatoplantlets
AT galagovskylr comparativeanalysisoftheeffectsofhomocastasteroneandtwoderivativesonshootandmainrootelongationoftomatoplantlets
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