Physiological parameters of tomato plants subjected to salinity and treated with brassinosteroid

Maia Júnior, Sebastião de Oliveira; Andrade, Jailma Ribeiro de; Nascimento, Ronaldo do; Lima, Robson Felipe de; Nascimento, Elka Costa Santos; Ferreira, Vilma Marques

doi:10.1590/S1678-3921.pab2022.v57.01885

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Plant Physiology • Pesq. agropec. bras. 57 • 2022 • https://doi.org/10.1590/S1678-3921.pab2022.v57.01885 linkcopy

Physiological parameters of tomato plants subjected to salinity and treated with brassinosteroid

Parâmetros fisiológicos em plantas de tomate submetidas à salinidade e tratadas com brassinosteroide

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The objective of this work was to evaluate the effects of brassinosteroid on chlorophyll a fluorescence parameters, the SPAD index, and leaf succulence in young tomato (Lycopersicon esculentum) plants under salt stress. The experimental design was a randomized complete block, in a 5×2 factorial arrangement - five levels of water salinity (0.5, 1.5, 3.0, 4.5, and 6.0 dS m^-1) × two rates of 24-epibrassinolide (0 and 10^-6 mol L^-1 EBL). At 23 days, the treatment without EBL showed that the increase of water salinity reduced the maximum, primary, and effective photochemical efficiency of PSII, as well as the electron transport rate, the SPAD index, leaf succulence, total dry mass, and the stress tolerance index, but increased initial fluorescence and relative excess energy in PSII. With the increase of water salinity, in the EBL treatments, there was an increase in the effective photochemical efficiency of PSII, the electron transport rate, the SPAD index, leaf succulence, total dry mass, and the stress tolerance index. EBL promotes beneficial effects on PSII integrity, the chlorophyll index, and leaf succulence in young tomato plants subjected to salinity levels of up to 6.0 dS m^-1 .

Index terms Lycopersicon esculentum ; 24-epibrassinolide; leaf succulence; NaCl; photosystem II

Source of variation	Degree of freedom	F test
Source of variation	Degree of freedom	Fo	Fm	Fv	Fv/Fm	Fv/Fo	Y
Salinity	4	^* * ,	ns	ns	^* * ,	^* * ,	^ Significant at 5% and 1% probability, respectively.
EBL	1	ns	ns	ns	ns	ns	^ Significant at 5% and 1% probability, respectively.
Salinity×EBL	4	ns	ns	ns	ns	ns	^* * ,
Error	45	--	--	--	--	--	--
CV (%)		8.43	7.39	7.87	1.60	6.69	8.47
		ETR	EXC	SPAD	LS	TDM	STI
Salinity	4	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^* * ,	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.
EBL	1	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.
Salinity×EBL	4	^* * ,	^* * ,	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^ Significant at 5% and 1% probability, respectively.	^* * ,
Error	45	--	--	--	--	--	--
CV (%)		14.20	12.50	4.19	5.33	4.86	5.78

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Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira Caixa Postal 040315, 70770-901 Brasília DF Brazil, Tel. +55 61 3448-1813, Fax +55 61 3340-5483 - Brasília - DF - Brazil
E-mail: pab@embrapa.br

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[TFN1] ^ns
Nonsignificant.

[TFN2] ^*
,

[TFN3] ^**
Significant at 5% and 1% probability, respectively.