Plant physiology

About: Plant physiology is a research topic. Over the lifetime, 1537 publications have been published within this topic receiving 72038 citations.

Salicylic Acid: Role in Plant Physiology and Stress Tolerance

Abstract: The plant phenolic salicylic acid (SA) plays a regulatory role in plant physiology and metabolism. An updated review has been made based on previous and recent publications related to influence of SA on physiological processes of plants such as flowering, thermogenesis, membrane function, ion uptake, and photosynthesis. The role of SA as a mediator in disease resistance in plants is also described. This chapter deals with the role of SA in plant response to abiotic stress factors of various natures, i.e., temperature, heavy metal, ozone, salinity, and drought. The exact mechanism of SA action in plants as a signal molecule in stress mitigation and other biological processes needs to be understood.

Alternating high and low intensity of blue light affects PSII photochemistry and raises the contents of carotenoids and anthocyanins in pepper leaves

Abstract: The aim of the present study was to evaluate the morphological and physiological response of pepper plants (Capsicum annuum L.) as affected by different light regimes. In this context, we hypothesized that the illumination with proportionally high blue light under low light conditions induces stress-related responses and leads to stronger accumulation of protective pigments. For this purpose, pepper plants of the cultivar Yolo Wonder B were cultivated in a climate chamber under compact fluorescence lamps (CFL) or light emitting diodes (LED). Light provided by LEDs was composed by either 15 or 75 % of blue, and completed by red light. In general, high blue light led to a stronger increase in heat dissipation, whereas the maximal photochemical efficiency remained almost unaffected. Biomass formation was lower under the LED light as compared to plants grown under CFL. However, different amounts of blue light did not impact plant morphological parameters such as stem length, leaf area and plant FM. Concentration of Chl a + b was significantly higher in plants grown under CFL, whereas the Chl a/Chl b ratio and leaf mass per area were increased under the LED treatments. In general, plants grown under blue and red LEDs accumulated significantly more flavonoids compared to plants grown under CFL. Additionally, the illumination with high blue light increased the synthesis and accumulation of anthocyanins and carotenoids, whereas flavonoid contents were not affected.

Uncoupling of phosphorylation in chlorella by 2,4-dichlorophenoxyacetic acid

Abstract: The plant growth regulator 2,4-D inhibits the incorporation of P32O4 into ATP and ADP by Chlorella to a much greater extent than it does the accumulation of inorganic phosphate by the cells.

The relationship of oxalic acid to the translocation and utilization of calcium inNicotiana tabacum

Abstract: Burley tobacco varieties (Nicotiana tabacum L.) which differed in degrees of susceptibility to calcium deficiency were analyzed for calcium and oxalic acid content. Calcium accumulated by the total plant top was not related to susceptibility to calcium deficiency. Upper leaves and buds of plants of susceptible varieties contained less calcium per unit weight than did upper leaves and buds of non-susceptible varieties.