Chlorophyll a fluorescence is a highly sensitive, non-destructive, and reliable tool for measuring, rather quickly, photosynthetic efficiency, particularly of Photosystem II (PSII), the water-plastoquinone oxidoreductase. We briefly review here the connection between the fast (up to 2 s) chlorophyll fluorescence rise and PSII, as well as the empirical use of the fluorescence rise kinetics in un...

Chloride ions can be translocated across cell membranes through Cl(-) channels or Cl(-)/H(+) exchangers. The thylakoid-located member of the Cl(-) channel CLC family in Arabidopsis thaliana (AtCLCe) was hypothesized to play a role in photosynthetic regulation based on the initial photosynthetic characterization of clce mutant lines. The reduced nitrate content of Arabidopsis clce mutants sugges...

In the present work, effectiveness of chlorophyll a fluorescence as quick tool to detect effect Pb–stress on Limbarda crithmoides and Helianthus annuus species, when exposed increasing Pb concentrations (0–500 µmol.L–1) for 45 days, was evaluated. The level in plant leaves, well fresh weight content shoots roots both were also determined. L. did not show any significant variation photochemical ...

Abstract In vitro cultivation is a technique with wide application for micropropagation. However, each species has specific mineral needs this type of cultivation. The objective was to assess the impacts saline solution culture medium on performance photosynthetic apparatus and growth Bromelia antiacantha during in cultivation, thus elucidate mitigation nutritional imbalance that can interfere ...

Manganese (Mn) excess is a major abiotic stress for plant growth. In the present study, we investigated effects of Mn on photosynthesis in Ligustrum lucidum and Melia azedarach leaves using chlorophyll fluorescence transients. Both species were exposed to two concentrations (0.5 1 mmol) 10 30 d. Results showed that significantly inhibited photosynthesis. With increase concentration time, inhibi...

As a typical warm-season grass, Bermudagrass [Cynodon dactylon (L).Pers.] is widely applied in turf systems and animal husbandry. However, cold temperature is a key factor limiting resource utilization for Bermudagrass. Therefore, it is relevant to study the mechanisms by which Burmudagrass responds to cold. Melatonin is a crucial animal and plant hormone that is responsible for plant abiotic s...

The purpose of this paper is to demonstrate the complementary utility of chlorophyll fast fluorescence OJIP transient (from 50 microns to 1s) measurements in the aerial study of rows of trees. We identify limitations in photochemical events induced by urban injuries on Platanus acerfolia L. using the JIP-test procedure. The Performance Index (PIABS) showed the largest dynamic range to character...

هدف از این تحقیق تعیین مناطق دارای پتانسیل حضور چشمة آب زیرزمینی و اولویت‌بندی عوامل مؤثر در آن، با استفاده روش حداکثر آنتروپی (مدل MaxEnt)، سیستم اطلاعات جغرافیایی سنجش دور است. حاضر، چهارده شاخص تأثیرگذار شامل شاخص‌های توپوگرافیکی، زمین‌شناسی، اقلیمی، هیدرولوژیکی کاربری اراضی همچنین، جدید ارتفاع سطح نزدیک‌ترین زهکش (HAND) شده ابتدا، شاخص‌ها به دو بخش توپوگرافیکی سایر تقسیم شدند نقشة براساس آن...