abstract germination and emergence of cold tolerant lentil genotypes sometimes experiences low temperatures and variable rainfalls in the fall planting. this study was conducted to evaluate the effects of drought stress on germination stage of lentil genotypes. experiment was carried out with 18 lentil genotypes under five levels of water potential (0 , -0.4 , -0.8 , -1.2 , -1.6 mpa) using peg ...

one of the important issues in the arid and semi-arid regions is the water deficit and soil salinity. therefore, selecting tolerant species to salinity and drought especially in seed germination and emergence stage is important. in the present study the effects of drought and salt stress on seed germination of vetch (vicia villosa l.) which is palatable forage was investigated. the germination ...

abstract seed germination is an important phase of plant development during which soil water availability is crucial. salinity can affect seed germination in two ways: 1) change of osmotic potential of available water, 2) toxicity effects. in this experiment, interactive effects of salinity and water deficit on germination criteria of two species of a, littoralis and a. logopoides were studied ...

Numerous studies have observed the physiological responses of soil microorganisms to water stress caused by soil drying, however, only a few have attempted to assess the microbial response in soil in situ. An experiment was conducted to analyze the change in extractable metabolites, particularly sugars and amino acids, in soil and the associated microbial community at various intensities of soi...

The effects of soil drying on leaf water relations and gas exchange were studied in quinoa grown in pots with sandy soil and in lysimeter plots with sandy loam in the field. Midday values of leaf water potential (cl), leaf osmotic potential (cp), relative water content (RWC), leaf conductance (gl), light saturated net photosynthesis (Asat), and specific leaf area (SLA) were determined in fully ...

Root anatomical responses to water deficit are diverse and regulation of water uptake strongly depends on plant anatomy. The ancestors of common bean (Phaseolus vulgaris L.) cultivars are the wild common beans. Because wild beans adapt and survive well in the natural environment, it is hypothesized that wild common bean roots are less affected than those of domesticated beans at low substrate w...

Increasing temperature and CO2 concentrations can alter tritrophic interactions in ecosystems, but the impact of increasingly severe drought on such interactions is not well understood. We examined the response of a wheat-aphid-parasitoid system to variation in water-deficit stress levels. Our results showed that arid area clones of the aphid, Sitobion avenae (Fabricius), tended to have longer ...

IMP dehydrogenase (IMPDH) is the rate-limiting enzyme for de novo GMP synthesis. Its activity is correlated with cell growth, and it is the target of a number of proven and experimental drug therapies including mycophenolic acid (MPA). MPA inhibits the enzyme by trapping a covalent nucleotide-enzyme intermediate. Saccharomyces cerevisiae has four IMPDH genes called IMD1-IMD4. IMD2 is transcript...

Ultrasound-induced hemorrhage near the fetal rat skull was investigated to determine if the damage could be correlated with temporal-average intensity. A 0.92-MHz f/1 spherically focused transducer (5.1-cm focal length) was used to expose the skull of 18- to 19-day gestation exteriorized Sprague-Dawley rat fetuses (n = 197). There were four ultrasound-exposed groups (n = 36 each), one sham expo...