BORON DEFICIENCY AFFECTS GAS EXCHANGE AND PHOTOCHEMICAL EFFICIENCY (JPI TEST PARAMETERS) IN GREEN DWARF COCONUT

Autor:	Eliemar Campostrini, Pedro Henrique Monnerat, André Assis Pires, Cláudio Roberto Marciano, Leandro Glaydson da Rocha Pinho, Yaska Janaína Bastos Soares, Alena Torres Netto
Rok vydání:	2010
Předmět:	Photosystem II Physiology Chemistry Vapor pressure food and beverages chemistry.chemical_element Plant physiology macromolecular substances Photosynthesis Photochemistry chemistry.chemical_compound Cocos nucifera Chlorophyll Boron Agronomy and Crop Science Plant nutrition
Zdroj:	Journal of Plant Nutrition. 33:439-451
ISSN:	1532-4087 0190-4167
DOI:	10.1080/01904160903470471
Popis:	Boron (B) deficiency causes a wide array of symptoms, not only among species of palms, but also within a single species (i.e. Cocos nucifera). A better understanding of the effects of B deficiency in coconut will be important to try optimizing a rational fertilization management in coconut plants. Thus, modification of PSII photochemistry (using a group of fluorescence parameters, called the JIP- test, that quantify the stepwise flow of energy through Photosystem II) and gas-exchange in boron deficient green dwarf coconut plants were investigated. Our results suggest that a modification of PSII photochemistry (non-stomatic effects) and gas-exchange (stomatic effects) were induced by boron deficiency. Such modifications are manifested by (1) increase the ratio of total dissipation to the amount of active reaction centers (RCs) [dissipation (DI)/RC] and (2) leaf-to-air vapor pressure difference (VPDleaf-air). These modifications (on PSII photochemistry and gas-exchange) were caused by a decrease in energy a...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::625b84bec40a36b399392cac541a361d https://doi.org/10.1080/01904160903470471 Zobrazit plný text záznamu