GAS EXCHANGES, QUANTUM YIELD AND PHOTOSYNTHETIC PIGMENTS OF WEST INDIAN CHERRY UNDER SALT STRESS AND POTASSIUM FERTILIZATION

DIAS, ADAAN SUDARIO; LIMA, GEOVANI SOARES DE; PINHEIRO, FRANCISCO WESLEY ALVES; GHEYI, HANS RAJ; SOARES, LAURIANE ALMEIDA DOS ANJOS

doi:10.1590/1983-21252019v32n216rc

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Engenharia Agrícola • Rev. Caatinga 32 (2) • Apr-Jun 2019 • https://doi.org/10.1590/1983-21252019v32n216rc copy

GAS EXCHANGES, QUANTUM YIELD AND PHOTOSYNTHETIC PIGMENTS OF WEST INDIAN CHERRY UNDER SALT STRESS AND POTASSIUM FERTILIZATION¹ 1 Paper extracted from the postdoctoral research of the second author.

TROCAS GASOSAS, RENDIMENTO QUÂNTICO E PIGMENTOS FOTOSSINTÉTICOS DA ACEROLEIRA SOB ESTRESSE SALINO E ADUBAÇÃO POTÁSSICA

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Water resources in the semi-arid region of Northeast Brazil commonly contain high salt concentrations, compromising the quality of water for agriculture. Thus, adopting techniques that make the use of these resources feasible in agriculture is fundamental. The present study aimed to evaluate the gas exchanges, quantum yield and photosynthetic pigments of grafted West Indian cherry subjected to salt stress and potassium fertilization under greenhouse conditions in the municipality of Campina Grande, PB, Brazil. Treatments were distributed in randomized blocks, composed of two levels of electrical conductivity - ECw (0.8 and 3.8 dS m^-1) of water and four doses of potassium (50, 75, 100 and 125% of the dose recommended for the crop), with three replicates. The dose relative to 100% corresponded to 19.8 g of K₂O per plant. Gas exchanges, chlorophyll a fluorescence and photosynthetic pigments of West Indian cherry are negatively affected by irrigation using water with electrical conductivity of 3.8 dS m^-1, which compromises the photosynthetic apparatus of the plant, a situation evidenced by the reduction in photosystem II quantum efficiency. Increasing potassium doses led to increments in transpiration, chlorophyll a maximum fluorescence and chlorophyll b content in West Indian cherry grown under salt stress, but do not attenuate the negative effects of irrigation with 3.8 dS m^-1 water on its potential photochemical efficiency.

Keywords:
Malpighia emarginata; Physiology; Potassium; Salinity

Source of variation	Test F
	E	gs	A	Ci	CEi	WUEi
Saline levels (SL)	**	**	**	*	**	ns
K dose (KD)	*	ns	ns	ns	ns	ns
Interaction (SL x KD)	ns	ns	ns	ns	ns	ns
Blocks	ns	ns	ns	ns	ns	ns
CV (%)	17.28	13.59	19.01	23.59	15.37	13.29

Source of variation	Test F
	Fo	Fm	Fv	Fv/Fm	Chl a	Chl b	Car
Saline levels (SL)	**	*	**	**	*	**	**
K dose (KD)	ns	ns	ns	ns	ns	**	ns
Interaction (SL x KD)	ns	*	ns	*	ns	**	ns
Blocks	ns	ns	ns	ns	ns	ns	ns
CV (%)	7.79	16.93	13.22	19.77	23.79	24.02	15.29

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[1] ^* Corresponding author: geovani.soares@pq.cnpq.br

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GAS EXCHANGES, QUANTUM YIELD AND PHOTOSYNTHETIC PIGMENTS OF WEST INDIAN CHERRY UNDER SALT STRESS AND POTASSIUM FERTILIZATION1 1 Paper extracted from the postdoctoral research of the second author.

TROCAS GASOSAS, RENDIMENTO QUÂNTICO E PIGMENTOS FOTOSSINTÉTICOS DA ACEROLEIRA SOB ESTRESSE SALINO E ADUBAÇÃO POTÁSSICA

ABSTRACT

GAS EXCHANGES, QUANTUM YIELD AND PHOTOSYNTHETIC PIGMENTS OF WEST INDIAN CHERRY UNDER SALT STRESS AND POTASSIUM FERTILIZATION¹ 1 Paper extracted from the postdoctoral research of the second author.