EFFECT OF VARIOUS TEMPERATURES IN THE ROOT ZONE AND LIGHT INTENSITIES ON PHOTOSYNTHESIS AND TRANSPIRATION OF TOMATO PLANTS

Photosynthetic intensity, transpiration and stomatal resistance (R_s) of tomato plant leaves were studied at various light intensities and temperatures in the root zone. Temperature regime had an insignificant effect on a gas exchange of plants at an irradiation of 900μmol m^<-2> s^<-1>. Less irradiation, 180μmol m^<-2> s^<-1>, resulted in a relatively greater effect of temperature on CO_2 uptake. Transpiration rate and stomatal resistance to CO_2 varied slightly within a wide range of temperature changes. An increase and decrease of R_s were observed only at low (<14) and high (>28℃) temperatures, respectively. Reverse dependence was found for the process of transpiration. The highest transpiration coefficient Ph/T was observed at 20℃. The results indicate that it is necessary to take all the aspects of plant activity into account for determining optimal growth conditions

EFFECT OF VARIOUS TEMPERATURES IN THE ROOT ZONE AND LIGHT INTENSITIES ON PHOTOSYNTHESIS AND TRANSPIRATION OF TOMATO PLANTS

Photosynthetic intensity, transpiration and stomatal resistance (R_s) of tomato plant leaves were studied at various light intensities and temperatures in the root zone. Temperature regime had an insignificant effect on a gas exchange of plants at an irradiation of 900μmol m^ s^. Less irradiation, 180μmol m^ s^, resulted in a relatively greater effect of temperature on CO_2 uptake. Transpiration rate and stomatal resistance to CO_2 varied slightly within a wide range of temperature changes. An increase and decrease of R_s were observed only at low (28℃) temperatures, respectively. Reverse dependence was found for the process of transpiration. The highest transpiration coefficient Ph/T was observed at 20℃. The results indicate that it is necessary to take all the aspects of plant activity into account for determining optimal growth conditions

The role of MRI in staging and radiotherapy treatment planning in locally advanced nasopharyngeal carcinoma – case report

Nasopharyngeal carcinoma (NPC) is a rare disease. The “Golden imaging standard” for primary tumor and regional lymph nodes staging in NPC is MRI- magnetic resonance imaging. Radiotherapy is the main treatment modality in both early and locoregional advanced NPC. Radiotherapy alone is recommended only in T1N0M0 stage NPC, while in higher stages for best treatment results contributes radiotherapy with concomitant chemotherapy. The aim is to report a case of a patients with NPC presented to our department with clinical and MRI data for scull base and brain invasion. Tumor staging included PET/CT scan and MRI, which were used also for treatmentplanning. The patient was treated with definitive radiotherapy to 64 Gy, concomitantly with weekly Cisplatin. VMAT and IGRT treatment techniques were used. One year later a complete response is observed without late toxicity and grade 2 dry mouth. Using of MRI for initial staging and radiotherapy planning in NPC is very important due to precise findings of the tumor invasion and a correct definition of the treatment volume. MRI staging should be part of the initial staging and follow up algorithm in all patients with NPC

Phenolics as Plant Protective Companion Against Abiotic Stress

Abiotic stress has become a major risk to food security and is predominantly the leading cause of extensive crop and agriculture produce loss worldwide. It has been estimated that about 50% of major agriculture produce is lost due to various abiotic stress factors. Plants perceive risk alarm by virtue of their receptors and activate protective mechanism to sustain against abiotic stresses. These protective mechanisms include accumulation of protective metabolites such as phenolics, terpenes and alkaloids, out of which phenolics play a vital role in the survival of the plant under various abiotic stresses. Enhanced synthesis of phenolics assures the survival, persistence, endurance and competitiveness of the plant against abiotic stress