Maternal control of early life history traits affects overwinter survival and seedling phenotypes in sunflower (Helianthus annuus L.).

When cultivated and wild plants hybridize, hybrids often show intermediate phenotypic traits relative to their parents, which makes them unfit in natural environments. However, maternal genetic effects may affect the outcome of hybridization by controlling expression of the earliest life history traits. Here, using wild, cultivated and reciprocal crop-wild sunflower (Helianthus annuus L.) hybrids, we evaluated the maternal effects on emergence timing and seedling establishment in the field and on seedling traits under controlled conditions. In the field, we evaluated reciprocal crop-wild hybrids between two wild populations with contrasting dormancy (the high dormant BAR and the low dormant DIA) and one cultivar (CROP) with low dormancy. Under controlled conditions, we evaluated reciprocal crop-wild hybrids between two wild populations (BAR and RCU) and one CROP under three contrasting temperature treatments. In the field, BAR overwintered as dormant seeds whereas DIA and CROP showed high autumn emergence (~50% of planted seeds), resulting in differential overwinter survival and seedling establishment in the spring. Reciprocal crop-wild hybrids resembled their female parents in emergence timing and success of seedling establishment. Under controlled conditions, we observed large maternal effects on most seedling traits across temperatures. Cotyledon size explained most of the variation in seedling traits, suggesting that the maternal effects on seed size have cascading effects on seedling traits. Maternal effects on early life history traits affect early plant survival and phenotypic variation of crop-wild hybrids, thus, they should be addressed in hybridization studies, especially those involving highly divergent parents, such as cultivated species and their wild ancestors.

[The movement computerized analysis as instrumental support for occupational doctors in evaluation of upper limb pathologies in engineering workers]. / L'analisi computerizzata del movimento come strumento di supporto al Medico del Lavoro nella valutazione dei disturbi muscolo-scheletrici degli arti superiori nel comparto metalmecanico.

The movement computerized analysis of upper limb is a valid support in the definition of residual functional capability and of specific work suitability in complex cases. This methodology of evaluation is able to correctly and objectively define the tridimensional ranges of motion of every patient's upper limb. This fact can be particularly useful for workers coming back to work after a work-related or a not work-related accident of for handicapped workers at the beginning of a new work activity. We report a research carried out using computerized analysis of motion of upper limbs in 20 engineering workers.

[Stabilometric parameters associated with musculoskeletal diseases in a group of traffic policemen]. / Parametri stabilometrici associati a disturbi muscoloscheletrici in un gruppo di vigili urbani.

As reported by previous literature, the prevalence of musculoskeletal disorders is high in population of local police officers, due to several risk factors, including awkward posture, jolt/vibrations and stress. The results of our study reveal that the most common musculoskeletal symptoms among local police officers are cervicobrachial pain, low back pain and sciatica. Low-back pain is associated with tasks exposing to awkward posture of the spine (traffic policemen and policemen involved in office-based duties); cervical and upper extremity disorders are related to the exposure to vibrations and to the upper limb posture held by motorcycle police. Among postural parameters, anterior scapular plane, flat back and Barre's vertical resulted possible predictive tests of adaptation of the postural system to the symptom pain in subjects with low back pain. In conclusion, it is necessary to adopt organizational, protective and preventive measures in order to occupational health of local police officers. They include: decrease of time periods during which an awkward posture is held, breaks between duties, prescription of ergonomic shoes, use of low-weight and low-volume duty-packs, and planning of periodical osteopathic check-ups as part of the health program, aimed to uncover initial postural alterations related to musculoskeletal disorders.