Soil microorganisms, such as plant growth-promoting rhizobacteria (PGPR), play crucial roles in plant growth, but their influence on plant water relations remains poorly explored. We studied the effects of native soil microorganisms and inoculation with the PGPR strain Aur6 of Pseudomonas fluorescens on water stress responses of seedlings of the drought-avoiding Pinus halepensis Mill. and the d...

Abstract Soybean was planted in clay pots with living mulch of white clover (CL) or shredded paper (SP). Soil moisture the individually controlled at five levels from around 20% volumetric soil water content (SWC) to near-saturated, by monitoring SWC every morning and irrigating intermittently. This study focussed on growth period soybean when plant height LAI reached maximum. The lower evapotr...

Silicon (Si) fertilization provides benefits to sugarcane. However, information remain scarce about the relationship between Si fertilization, gas exchange responses, biomass and silicophytolith accumulation in contrasting drought tolerant sugarcane cultivars under well-watered conditions Sugarcane (drought-tolerant drought-sensitive) were grown pots containing soil with low available treated (...

OBJECTIVE To study the effects of gamma-ray irradiation on carbon fixation (Specific production rate: SPR), CO2 utilization efficiency (CUE) and electron transfer rate (ETR) in the photosynthetic flagellate Euglena gracilis strain Z in a dose-response dependent manner. METHODS Euglena cells were cultured in an inorganic nutrient medium containing ammonium chloride or proteose peptone. Cells w...

Abstract Mefenpyr-diethyl is a foliar-acting safener of the pyrazoline chemical group, and after its absorption, metabolization detoxification herbicides occur in treated plants. Studies have demonstrated protective effect this for herbicide fenoxaprop-P-ethyl grass. Thus, work aimed to evaluate whether tank mixture mefenpyr-diethyl has response haloxyfop-methyl non-perennial bahiagrass. The ex...

Plants undergoing heat and low-CO2 stresses emit large amounts of volatile isoprenoids compared with those in stress-free conditions. One hypothesis posits that the balance between reducing power availability and its use in carbon assimilation determines constitutive isoprenoid emission rates in plants and potentially even their maximum emission capacity under brief periods of stress. To test t...

Measurements of the photosynthetic activity of symbiotic zooxanthellae in corals under natural growth conditions has been limited until recently, and this is one of the ®rst reports on utilising a newly developed underwater pulse amplitude modulated (PAM) ̄uorometer (the Diving-PAM, Walz Gmbh, Germany) for such studies in situ. Photosynthetic responses to irradiance (photosynthetic photon ̄ux, P...

Two methods of measuring primary production, modulated fluorimetry (PAM) and the traditional carbon incorporation method ((13)C), were compared in four phytoplankton species, two diatoms (Pseudo-nitzschia pungens and Asterionellopsis glacialis), and two dinoflagellates (Heterocapsa sp and Karenia mikimotoï), under N (nitrogen), P (phosphorus) and Si (silicon) limited semi-continuous culture. N ...

The aim of this study is to evaluate the  effects of water deficit stress on chlorophyll fluorescence (CF) characteristics of photosystem II (PSII) and pigment contents in two rootstock seedlings (Pistacia atlantica L. and P. khinjuk L.). Three levels of soil water potential (Ψs) was used, including WWD (-0.05 MPa), MWD (-0.7 MPa) and SWD (-1.5 MPa). It was found that water stress increased the...