Physiology and metabolism of grafted bell pepper in response to low root-zone temperature.

Low temperature is a prominent limiting factor for tropical originated crops production in temperate regions, particularly during cool-season production. The diverse response of two rootstocks (Canon-sensitive and S103-tolerant to low root-zone temperature) was studied when exposed to aeroponically different temperature regimes at the root zone: constant low temperature of 14°C low root-zone temperature (LRZT), transient exposure to LRZT of 27-14-27°C and control temperature of 27°C. Gas exchange, shoot dry mass, and root morphology were measured. Shifts in central and secondary metabolite levels in the leaves and roots were examined by gas chromatography-mass spectrometry (GC-MS). Low root-zone temperature inhibited photosynthesis and transpiration of both grafted bell pepper plants; however, self-grafted Canon physiology was impeded to a greater extent compared with Canon grafted onto rootstock S103. Rootstock S103 demonstrated higher sink potential contributing to milder reduction of photosynthesis and transpiration during stress compared with self-grafted Canon. This reduction of gas exchange led to a significant reduction of root maximum length and root dry mass in self-grafted Canon in response to the stress at 14°C compared with Canon grafted onto rootstock S103. In response to stress, GC-MS metabolite profiling showed enhance metabolism in both cultivars' leaves, as well as in the roots irrespective of the developmental stage of the plant. This evidence combined indicates enhance gas exchange and carbon assimilation when bell pepper is grafted on S103 under low root-zone temperature.

Internal and External Resources and the Adjustment of Parents of Premature Infants.

Studies have shown premature birth and infant hospitalization to be associated with increased levels of parental distress. Internal and external psychological resources have been found to mitigate distress among persons coping with stressful medical events. The current study evaluated psychological resources and distress in 87 parents (57 mothers and 30 fathers) to whom an infant was born prematurely and hospitalized in the NICU of a large tertiary medical center. Parents were administered standardized measures of internal (problem-solving skills) and external (total spousal support, adequacy of spousal support) psychological resources and of psychological distress (depression, posttraumatic symptoms, and mood). Findings indicated that higher levels of problem-solving skills and more adequate spousal support, but not total spousal support, were related to lower levels of parental distress. Adequacy of spousal support and parents' problem-solving skills accounted for 18% of the variance in overall mood and 13.8% of the variance in posttraumatic stress symptoms. A significant two-way interaction was found between adequacy of spousal support and problem-solving skills such that individuals with better problem-solving skills reported better overall mood independent of the adequacy of spousal support they receive. However, for individuals with poor problem-solving skills, the adequacy of the spousal support they receive was a significant factor in determining their overall mood. The theoretical and clinical implications of these findings are discussed in terms of the accessibility of these resources to assessment and their potential for change via existing intervention approaches.

A bell pepper cultivar tolerant to chilling enhanced nitrogen allocation and stress-related metabolite accumulation in the roots in response to low root-zone temperature.

Two bell pepper (Capsicum annuum) cultivars, differing in their response to chilling, were exposed to three levels of root-zone temperatures. Gas exchange, shoot and root phenology, and the pattern of change of the central metabolites and secondary metabolites caffeate and benzoate in the leaves and roots were profiled. Low root-zone temperature significantly inhibited gaseous exchange, with a greater effect on the sensitive commercial pepper hybrid (Canon) than on the new hybrid bred to enhance abiotic stress tolerance (S103). The latter was less affected by the treatment with respect to plant height, shoot dry mass, root maximum length, root projected area, number of root tips and root dry mass. More carbon was allocated to the leaves of S103 than nitrogen at 17°C, while in the roots at 17°C, more nitrogen was allocated and the ratio between C/N decreased. Metabolite profiling showed greater increase in the root than in the leaves. Leaf response between the two cultivars differed significantly. The roots accumulated stress-related metabolites including γ-aminobutyric acid (GABA), proline, galactinol and raffinose and at chilling (7°C) resulted in an increase of sugars in both cultivars. Our results suggest that the enhanced tolerance of S103 to root cold stress, reflected in the relative maintenance of shoot and root growth, is likely linked to a more effective regulation of photosynthesis facilitated by the induction of stress-related metabolism.

Parents' and Teachers' Perceptions of Abnormal Attention Span of Elementary School-Age Children.

BACKGROUND: To determine teacher and parental perception of minimal expected sustained attention span during various daily tasks among elementary school children. METHODS: 54 parents and 47 teachers completed the attention span questionnaire (AtSQ) that was developed for this study. The AtSQ consists of 15 academic and leisure tasks that require a child's sustained attention. The study focused on third and fourth graders in Israel. RESULTS: There was a high degree of variability among teachers and parents in their responses to the AtSQ. The expected attention span of children as judged by parents was higher and more varied compared to teachers, and higher for girls than for boys. CONCLUSIONS: Our results indicate poor agreement in cutoff values for sustained attention span between teachers and parents and within each group.

Virtual peacemakers: mimicry increases empathy in simulated contact with virtual outgroup members.

This research examined virtual-human interactions as a new form of simulated contact between members of groups in conflict. A virtual human representing an outgroup member (a Palestinian) interacted with 60 Jewish Israeli participants in an experimental study. We manipulated postural mimicry by the virtual interaction partner during a conversation about a sensitive conflict issue. Mimicry increased empathy toward the Palestinians, irrespective of participants' feelings toward the Palestinians prior to the experiment. Further, mimicked participants who reported a priori negative feelings toward Palestinians expressed more sympathy toward their Palestinian virtual interaction partner, rated themselves as closer to him, and perceived the interaction as more harmonious compared to participants in a counter-mimicry condition. The results underscore the impact of mimicry on intergroup interactions, especially on individuals who harbor negative feelings toward the outgroup. The use of virtual-human interactions in obtaining this effect reveals the still widely unexplored potential of technology-enhanced conflict resolution.

Cyclic nucleotide-gated channels in plants.

Until recently the role of cyclic nucleotide monophosphates (cNMPs) in plants had been controversial, with equivocal data about their concentrations, biosynthetic and degrading enzymes, and cellular targets. This review discusses the current knowledge in this field, with focus on the largest class of cNMP targets in plant cells, the cyclic nucleotide-gated channels (CNGCs). Aspects of structure and function are addressed, with reference to studies in heterologous systems and in planta. The picture emerging, albeit still fragmented, is of proteins with diverse functions in the control of ion homeostasis, development, and defense against biotic and abiotic threats.