Field Trials of Plum Clones Transformed with the Plum pox virus Coat Protein (PPV-CP) Gene.

Transgenic clones C2, C3, C4, C5, C6, and PT-6, of plum (Prunus domestica L.) transformed with the coat protein (CP) gene of Plum pox virus (PPV), PT-23 transformed with marker genes only, and nontransgenic B70146 were evaluated for sharka resistance under high infection pressure in field trials in Poland and Spain. These sites differed in climatic conditions and virus isolates. Transgenic clone C5 showed high resistance to PPV at both sites. None of the C5 trees became naturally infected by aphids during seven (Spain) or eight (Poland) years of the test, although up to 100% of other plum trees (transgenic clones and nontransgenic control plants) grown in the same conditions showed disease symptoms and tested positively for PPV. Although highly resistant, C5 trees could be infected artificially by chip budding or via susceptible rootstock. Infected C5 trees showed only a few mild symptoms on single, isolated shoots, even up to 8 years post inoculation. These results clearly indicate the long-term nature and high level of resistance to PPV obtained through genetically engineered resistance.

Cooperation in Treatment as an Indicator of Adaptation of Kidney Transplant Patients to Chronic Therapy.

BACKGROUND: Cooperation between patients and physicians in chronic treatment is an important factor in the patients' adaptation to difficult circumstances. The search is ongoing for factors important to the physician-patient relationship, with the goal of identifying deficits and psychological resources of the patients and medical soft skills of the physicians that can affect the quality of cooperation. The aim of this study was to analyze the psychological mechanisms of patient cooperation with physicians in the area of treatment after kidney transplantation. METHODS: The study group consisted of 105 patients (62 male patients and 43 female patients) aged 25 to 82 years (mean age, 50.91 years) after kidney transplantation who remained in the follow-up protocol of the Outpatient Transplant Clinic. A questionnaire was used to examine the compatibility of ratings as expressed by the patients and their physicians in 10 areas of cooperation in treatment. The tests for a sense of self-efficacy (General Self-Efficacy Scale), optimism (Life Orientation Test-Revised), and the control of emotions (Courtauld Emotional Control Scale) in Juczynski's adaptation were used in the study of psychological factors. RESULTS: Only 1 case reached total congruity by the patients and their physicians in all 10 areas of cooperation. In 3 areas, compliance was achieved in 70%, 72%, and 76%, respectively; in 6 areas, 50% to 66%; and in 1 sphere, 37%. We found no significant impact of psychological factors on patient compliance. A comparison was made of 2 groups of patients (1 of which was characterized by a high compatibility between the physician and patient assessments, and the second which was characterized by the lack of conformity). Moreover, assessment of the functioning of the transplanted kidneys was rated higher in those patients who achieved a high compliance with the opinions of medical cooperation in the treatment. CONCLUSIONS: The quality of cooperation measured by using compliance assessments of the patients and physicians in health behaviors is satisfactory. This finding translated into a favorable assessment of the functioning of the transplanted kidney expressed by the patients. Qualitative information provides guidance for targeted increasing collaboration.

Psychological Predictors of Cooperation in the Chronic Treatment of Kidney Transplantation Patients.

INTRODUCTION: A patient who complies with doctor recommendations is an indicator of proper cooperation in treatment. It is affected by environmental factors, soft competences of the doctors, and properties of the human personality. We investigated the psychological characteristics of patients that may facilitate human contact and promote healthy behaviors. The aim of the study was to analyze the importance of psychological factors for the occurrence of health-related behaviors necessary for cooperation in treatment. MATERIAL AND METHODS: The study was conducted in a group of 105 patients (62 males and 43 females) aged from 25 years to 82 years old (mean, 50.4 years) after kidney transplantation who remained in follow-up at the Outpatient Transplant Clinic. We used two questionnaires: one for the patients and one for their doctors, including an assessment of healthy behaviors listed in 10 categories. The patients also completed the tests exploring the sense of self-efficacy (generalized self-efficacy scale), optimism (life orientation test - revised) and the control of emotions (Courtauld emotional control scale) in a Polish adaptation by Zygfryd Juczynski. In the statistical analysis, the Spearman rank correlation coefficient and the Kanonicza analysis were used, adopting the significance level of P < .05. RESULTS: We found significant correlations between psychological factors and behaviors of the patients. The patients controlling the expression of anxiety often concentrated on cleanliness and hygiene (P = .013). The patients controlling the expression of anger (P = .008) and anxiety (P = .049) were less likely to perform self-observation, being of the opinion that the role of the physicians was to evaluate the development of the disease and advances in treatment. The patients with higher levels of optimism were perceived by the physicians as better cooperating in conducting self-observation (P = .024) and adherence to hygiene (P = .047); they were also less frequently struggling with ophthalmic problems (P = .004). The relationship between the factors associated with the disease and treatment (pressure, the efficiency of the transplanted kidney, and duration of treatment) and psychological factors (optimism, emotional control, and self-efficacy) has been confirmed. The emerged factors significantly affected each other, which indicated the matching of the model (P = .08). CONCLUSIONS: The analysis of the results shows that psychological and somatic functioning of patients has a strong relationship with certain pro-health behaviors that determine the collaboration in treatment. This can serve as a basis for modifying the rules of managing the patients.

Preliminary report on the apparent breaking of resistance of a transgenic plum by chip bud inoculation of plum pox virus PPV-S.

Five transgenic clones of Prunus domestica L. containing plum pox virus (PPV) coat protein (CP) gene and one non-transformed control clone were challenged with PPV-S in the field. Symptoms developed on C2, C3, C4, C6 and B70146 but not C5 trees inoculated by chip budding (CBI) (2/2, 2/2, 1/1, 2/2 and 2/2, positive/inoculated) in the first summer after inoculation. However, in the second year, symptoms appeared on CBI C5 trees. The presence of the virus in the plants was confirmed by enzyme-linked immunosorbent assay (ELISA) and reverse transcription-polymerase chain reaction (RT-PCR) amplification of a fragment of viral polymerase gene. During two years, symptoms of infection developed on 3 to 4 of 8 non-inoculated trees of clones C2, C3, C4, C6 and B70146. Eight non-inoculated C5 trees remained symptomless and ELISA-negative as of spring 1998, in spite of the presence of aphid vectors and inoculum sources.