Diurnal patterns of chlorophyll a fluorescence and stomatal conductance in species of two types of coastal tree vegetation in southeastern Brazil

Trees ◽  
1997 ◽  
Vol 11 (6) ◽  
pp. 363-369 ◽  
Author(s):  
Eduardo A. de Mattos ◽  
T. E. E. Grams ◽  
Erika Ball ◽  
Augusto C. Franco ◽  
A. Haag-Kerwer ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Southeastern Brazil ◽  
Diurnal Patterns

scholarly journals Comparative stomatal conductance and chlorophyll a fluorescence in leaves vs. fruits of the cerrado legume tree, Dalbergia miscolobium

2004 ◽  
Vol 16 (2) ◽  
pp. 89-93 ◽  
Author(s):  
José Pires de Lemos Filho ◽  
Rosy Mary dos Santos Isaias
Keyword(s):  
Water Vapor ◽  
Stomatal Conductance ◽  
Quantum Yield ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Electron Transport Rate ◽  
Early Morning ◽  
Effective Quantum Yield ◽  
Quantum Yield Of Psii ◽  
Chronic Photoinhibition

The aim of this study was to compare water vapor conductance and chlorophyll a fluorescence between leaflets and fruits of Dalbergia miscolobium, the Jacaranda tree. The frequency of stomata on the leaflets was 20 times higher than that observed on the fruits, and this was related with the lower conductance of the fruits in comparison with the leaflets. The potential quantum yield of PSII (Fv /Fmax) was significantly lower in fruits than in leaflets. The Fv /Fmax values for leaflets increased to over 0.8 during the afternoon, indicating the occurrence of dynamic photoinhibition. In contrast, Fv /Fmax values for fruits remained low even at early morning, indicating the occurrence of chronic photoinhibition. The maximum values of effective quantum yield (deltaF/F'm), and of the apparent electron transport rate (ETRmax) were higher in leaflets than in fruits. It was concluded that, like other green tissues, the pericarp of D. miscolobium was photosynthetically active, and therefore can contribute to the maintenance of the fruits and/or to the development of the seeds.

scholarly journals TROCAS GASOSAS E EFICIÊNCIA FOTOQUÍMICA DO GERGELIM SOB ESTRESSE SALINO E ADUBAÇÃO COM NITRATO-AMÔNIO

Irriga ◽  
2018 ◽  
Vol 23 (2) ◽  
pp. 220-234 ◽  
Author(s):  
Adaan Sudário Dias ◽  
Geovani Soares de Lima ◽  
Hans Raj Gheyi ◽  
Reginaldo Gomes Nobre ◽  
Pedro Dantas Fernandes ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Chlorophyll A ◽  
Quantum Efficiency ◽  
Irrigation Water ◽  
Chlorophyll A Fluorescence ◽  
Photochemical Efficiency ◽  
Sesamum Indicum ◽  
Saline Stress ◽  
Leaf Transpiration

TROCAS GASOSAS E EFICIÊNCIA FOTOQUÍMICA DO GERGELIM SOB ESTRESSE SALINO E ADUBAÇÃO COM NITRATO-AMÔNIO     ADAAN SUDÁRIO DIAS1; GEOVANI SOARES DE LIMA2; HANS RAJ GHEYI3; REGINALDO GOMES NOBRE4; PEDRO DANTAS FERNANDES5 E FRANCISCO ALVES DA SILVA6   1Unidade Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, [email protected] 2Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, [email protected] 3Núcleo de Engenharia de Água e Solo, Universidade Federal do Recôncavo da Bahia, UFRB, Rua Rui Barbosa,710 -Centro, Cruz das Almas, BA. [email protected] 4Departamento de Ciências e Tecnologia, Universidade Federal Rural do Semiárido, UFERSA, Avenida Universitária Leto Fernandes, km 01, Sitio Esperança II, Zona Rural Caraúbas, RN, [email protected] 5Unidade Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, [email protected] 6Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, [email protected]     1 RESUMO   Na região semiárida a qualidade da água usada na irrigação varia tanto em termos geográficos quanto ao longo do ano, sendo comum a ocorrência de águas com elevada concentração de sais, evidenciando a necessidade de pesquisas visando à obtenção de tecnologias que possam minimizar os efeitos deletérios da salinidade às plantas. Deste modo, objetivou-se com este trabalho avaliar as trocas gasosas e a fluorescência da clorofila a do gergelim cv. CNPA G3 irrigado com águas salinizadas e adubação com diferentes combinações de nitrato e amônio. O experimento foi conduzido em vasos adaptados como lisímetros em condições de casa-de-vegetação no município de Campina Grande, PB. Os tratamentos foram distribuídos em blocos ao acaso, em esquema fatorial 5 x 5, sendo cinco níveis de condutividade elétrica da água de irrigação - CEa (0,6; 1,2; 1,8; 2,4 e 3,0 dS m-1) e cinco combinações de nitrato-NO3- e amônio-NH4+ (200:0; 150:50; 100:100; 50:150; 0:200 mg de N kg-1 de solo), com três repetições. A salinidade da água de irrigação a partir de 0,6 dS m-1 promoveu depleção nas trocas gasosas e fluorescência da clorofila a do gergelim cv. CNPA G3; a adubação com nitrogênio na forma amoniacal (0/200 NO3-/NH4+) proporcionou efeito negativo sobre a condutância estomática, transpiração foliar e a eficiência quântica potencial do gergelim; o fornecimento de N na forma mista, sobretudo, nas plantas irrigadas com água de elevada salinidade, promoveu incremento na concentração interna de CO2. Houve interação significativa entre os níveis salinos e as combinações de nitrato e amônio para condutância estomática, transpiração foliar e eficiência quântica potencial do gergelim cv. CNPA G3.   Palavras-chave: Sesamum indicum L., Qualidade de água. N-NH4+, N-NO3-, Fotossíntese.       DIAS, A. S.; LIMA, G. S. de; GHEYI, H. R.; NOBRE, R. G.; FERNANDES, P. D.; SILVA, F. A. da GAS EXCHANGE AND PHOTOCHEMICAL EFFICIENCY OF SESAME UNDER SALINE STRESS AND NITRATE-AMMONIUM FERTILIZATION     2 ABSTRACT   In the semiarid region the quality of water used for irrigation varies both geographically and during the year, and water with high salt concentration is a common occurrence, indicating the need for research to find technologies that can minimize the deleterious effects of salinity on plants. Thus, the aim of this study was to evaluate gas exchange and chlorophyll a fluorescence of sesame cv. CNPA G3 irrigated with saline water and fertilized with different combinations of nitrate and ammonium. The experiment was conducted in lysimeters under greenhouse conditions in the municipality of Campina Grande, PB. Treatments were distributed in randomized blocks, in a 5 x 5 factorial scheme, with five levels of electrical conductivity of the irrigation water-ECw (0.6, 1.2, 1.8, 2.4 and 3.0 dS m-1) and five combinations of nitrate-NO3- and ammonium-NH4+ (200:0, 150:50, 100:100, 50:150, 0:200 mg of N kg-1 of soil), with three replicates. The salinity of irrigation water from 0.6 dS m-1 promoted depletion in gas exchange and chlorophyll a fluorescence of sesame cv. CNPA G3; fertilization with nitrogen in  ammoniacal form (0/200 NO3-/NH4+) affected negatively stomatal conductance, leaf transpiration and potential quantum efficiency of sesame; the supply of N in mixed form, especially in plants irrigated with high salinity water, promoted increase in internal CO2 concentration. There was significant interaction between saline levels and nitrate and ammonium combinations for stomatal conductance, leaf transpiration and quantum efficiency of sesame cv. CNPA G3.   Keywords: Sesamum indicum L. Water quality. N-NH4+, N-NO3-. Photosynthesis.

Photosynthetic responses of three C4 grasses of different metabolic subtypes to water deficit

2007 ◽  
Vol 34 (3) ◽  
pp. 204 ◽  
Author(s):  
Ana E. Carmo-Silva ◽  
Ana S. Soares ◽  
Jorge Marques da Silva ◽  
Anabela Bernardes da Silva ◽  
Alfred J. Keys ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Water Deficit ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Cynodon Dactylon ◽  
Net Photosynthesis ◽  
C3 Plants ◽  
C4 Grasses ◽  
Natural Habitats ◽  
Bisphosphate Carboxylase

C4 plants are considered to be less sensitive to drought than C3 plants because of their CO2 concentrating mechanism. The C4 grasses, Paspalum dilatatum Poiret (NADP-ME), Cynodon dactylon (L.) Pers (NAD-ME) and Zoysia japonica Steudel (PEPCK) were compared in their response to water deficit imposed by the addition of polyethylene glycol to the nutrient solution in which they were grown. The effects of drought on leaf relative water content (RWC), net photosynthesis, stomatal conductance, carboxylating enzyme activities and chlorophyll a fluorescence were investigated. In C. dactylon the RWC was more sensitive, but the photosynthetic activity was less sensitive, to water deficit than in P. dilatatum and Z. japonica. The decrease of photosynthesis in P. dilatatum under water deficit was not closely related to the activities of the carboxylating enzymes or to chlorophyll a fluorescence. However, decreased activities of ribulose 1,5-bisphosphate carboxylase/oxygenase and phosphoenolpyruvate carboxylase, in addition to decreased stomatal conductance, may have contributed to the decrease of photosynthesis with drought in C. dactylon and Z. japonica. The different responses to water deficit are discussed in relation to the natural habitats of C4 grasses.

scholarly journals Remote sensing of sun-induced chlorophyll-a fluorescence in inland and coastal waters: Current state and future prospects

2021 ◽  
Vol 262 ◽  
pp. 112482
Author(s):  
Remika S. Gupana ◽  
Daniel Odermatt ◽  
Ilaria Cesana ◽  
Claudia Giardino ◽  
Ladislav Nedbal ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Chlorophyll A ◽  
Coastal Waters ◽  
Chlorophyll A Fluorescence ◽  
Future Prospects ◽  
Current State

scholarly journals Simultaneously measuring carbon uptake capacity and chlorophyll a fluorescence dynamics in algae

2021 ◽  
Vol 58 ◽  
pp. 102399
Author(s):  
Jason Hupp ◽  
Johnathan I.E. McCoy ◽  
Allen J. Millgan ◽  
Graham Peers
Keyword(s):  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Carbon Uptake ◽  
Uptake Capacity

scholarly journals Chlorophyll a fluorescence illuminates a path connecting plant molecular biology to Earth-system science

Nature Plants ◽  
2021 ◽  
Author(s):  
Albert Porcar-Castell ◽  
Zbyněk Malenovský ◽  
Troy Magney ◽  
Shari Van Wittenberghe ◽  
Beatriz Fernández-Marín ◽  
...  
Keyword(s):  
Molecular Biology ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Plant Molecular Biology ◽  
Earth System ◽  
Earth System Science ◽  
System Science

Linking changes in chlorophyll a fluorescence with drought stress susceptibility in mung bean [ Vigna radiata (L.) Wilczek]

2021 ◽  
Author(s):  
Hussan Bano ◽  
Habib‐ur‐Rehman Athar ◽  
Zafar Ullah Zafar ◽  
Hazem M. Kalaji ◽  
Muhammad Ashraf
Keyword(s):  
Drought Stress ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Vigna Radiata ◽  
Mung Bean ◽  
Stress Susceptibility

scholarly journals Effects of Different Planting Densities on Photosynthesis in Maize Determined via Prompt Fluorescence, Delayed Fluorescence and P700 Signals

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 276
Author(s):  
Wanying Chen ◽  
Bo Jia ◽  
Junyu Chen ◽  
Yujiao Feng ◽  
Yue Li ◽  
...  
Keyword(s):  
Electron Transport ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Electron Transport Chain ◽  
Plant Density ◽  
Photosynthetic Electron Transport ◽  
Planting Density ◽  
Strong Impact ◽  
Photosynthetic Electron Transport Chain ◽  
Transport Chain

The mutual shading among individual field-grown maize plants resulting from high planting density inevitably reduces leaf photosynthesis, while regulating the photosynthetic transport chain has a strong impact on photosynthesis. However, the effect of high planting density on the photosynthetic electron transport chain in maize currently remains unclear. In this study, we simultaneously measured prompt chlorophyll a fluorescence (PF), modulated 820 nm reflection (MR) and delayed chlorophyll a fluorescence (DF) in order to investigate the effect of high planting density on the photosynthetic electron transport chain in two maize hybrids widely grown in China. PF transients demonstrated a gradual reduction in their signal amplitude with increasing planting density. In addition, high planting density induced positive J-step and G-bands of the PF transients, reduced the values of PF parameters PIABS, RC/CSO, TRO/ABS, ETO/TRO and REO/ETO, and enhanced ABS/RC and N. MR kinetics showed an increase of their lowest point with increasing high planting density, and thus the values of MR parameters VPSI and VPSII-PSI were reduced. The shapes of DF induction and decay curves were changed by high planting density. In addition, high planting density reduced the values of DF parameters I1, I2, L1 and L2, and enhanced I2/I1. These results suggested that high planting density caused harm on multiple components of maize photosynthetic electron transport chain, including an inactivation of PSII RCs, a blocked electron transfer between QA and QB, a reduction in PSI oxidation and re-reduction activities, and an impaired PSI acceptor side. Moreover, a comparison between PSII and PSI activities demonstrated the greater effect of plant density on the former.

Mapping QTLs for yield components and chlorophyll a fluorescence parameters in wheat under three levels of water availability

2011 ◽  
Vol 9 (2) ◽  
pp. 291-295 ◽  
Author(s):  
Ilona Czyczyło-Mysza ◽  
Izabela Marcińska ◽  
Edyta Skrzypek ◽  
Małgorzata Chrupek ◽  
Stanisław Grzesiak ◽  
...  
Keyword(s):  
Drought Stress ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Wheat Yield ◽  
Dry Weight ◽  
Interval Mapping ◽  
Main Stem ◽  
Severe Drought ◽  
Single Marker Analysis ◽  
Fluorescence Parameters

Drought is one of the major factors limiting wheat yield in many developing countries worldwide. Parameters of chlorophyll a fluorescence kinetics under drought stress conditions have been used to characterize dehydration tolerance in wheat. In the present study, a set of 94 doubled haploid lines obtained from Chinese Spring × SQ1 (CSDH), mapped with 450 markers, was evaluated for yield (grain dry weight/main stem ear), number of grains/main stem ear (NG) and chlorophyll a fluorescence parameters (FC) under moderate and severe drought stress, and compared with results for well-watered plants. quantitative trait loci (QTLs) were identified using Windows QTLCartographer version 2.5 software and the results were analysed using single-marker analysis (SMA) and composite interval mapping (CIM). Analysis using SMA and CIM showed mostly similar QTLs for all traits, though more QTLs were identified by SMA than by CIM. The genetic control of yield, NG and FC varied considerably between drought-stressed and non-stressed plants. Although no major QTL co-locations were found for yield and FC using CIM, the co-location of QTLs for NG, yield and Fv/Fm in drought-stressed plants was observed on chromosome 5A using SMA.

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