A catalytic manganese (Mn) cluster is required for the oxidation of water in the oxygen-evolving complex (OEC) of photosystem II (PSII) in plants. Despite this essential role of Mn in generating the electrons driving photosynthesis, limited information is available on how Mn deficiency affects PSII functionality. We have here used parameters derived from measurements of fluorescence induction k...

a r t i c l e i n f o Keywords: Chlorophyll fluorescence transient Dihomo-γ-linolenic acid Nitrogen deficiency OJIP On-line monitoring Parietochloris incisa We investigated effects of irradiance on the relationships between chlorophyll fluorescence transients (OJIP), carotenoid-to-chlorophyll ratio, and fatty acids in a nitrogen-deprived Parietochloris incisa (Chlorophyta, Trebouxiophyceae) Δ5 ...

Drought stress is one of the major limiting factors to crop productivity around globe. It has been well documented that spermidine (Spd) plays an important key role in plant growth and development, especially defense response stress. The objective this study was explore effect Spd on protecting photosynthetic apparatus tall fescue under drought application significantly improved OJIP (fluoresce...

Grafted seedlings have widely been used in fruit vegetables such as tomatoes order to increase productivity by acquiring resistance environmental stress and soil-borne diseases. This study was conducted assess the performance of rootstocks comparatively analyzing growth, yield, photosynthetic efficiency, measuring chlorophyll fluorescence, cherry grown soil cultivation. The tomato variety ‘Nona...

A simple kinetic model structure for chlorophyll fluorescence (ChlF) from Photosystem II (PSII) offers practical usefulness in quantitative analysis and extraction of information from measured ChlF. In this work, the major PSII phototransduction kinetics was represented with only five state variables. Parameters were estimated through a least-squares algorithm. The developed model structure cou...

Abstract The tolerance to low water availability is a decisive factor for growth and survival of orchids in their natural environment. objective this study was characterize the photochemical traits two epiphytic (Cattleya warneri Miltonia spectabilis) under deficit (WD). Chlorophyll fluorescence signals were recorded from young fully expanded leaves 5 plants/species after dark-adaption 60 minut...