Author Correction: Rice plants overexpressing OsEPF1 show reduced stomatal density and increased root cortical aerenchyma formation.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Rice plants overexpressing OsEPF1 show reduced stomatal density and increased root cortical aerenchyma formation.

Stomata are adjustable pores in the aerial epidermis of plants. The role of stomata is usually described in terms of the trade-off between CO2 uptake and water loss. Little consideration has been given to their interaction with below-ground development or diffusion of other gases. We overexpressed the rice EPIDERMAL PATTERNING FACTOR1 (OsEPF1) to produce rice plants with reduced stomatal densities, resulting in lowered leaf stomatal conductance and enhanced water use efficiency. Surprisingly, we found that root cortical aerenchyma (RCA) is formed constitutively in OsEPF1OE lines regardless of tissue age and position. Aerenchyma is tissue containing air-spaces that can develop in the plant root during stressful conditions, e.g. oxygen deficiency when it functions to increase O2 diffusion from shoot to root. The relationship with stomata is unknown. We conclude that RCA development and stomatal development are linked by two possible mechanisms: first that reduced stomatal conductance inhibits the diffusion of oxygen to the root, creating an oxygen deficit and stimulating the formation of RCA, second that an unknown EPF signalling pathway may be involved. Our observations have fundamental implications for the understanding of whole plant gas diffusion and root-to-shoot signalling events.

Chronic radiation enteritis.

Radiation enteritis is an iatrogenic disease of the intestines caused by radiation therapy. Two entities, chronic and acute radiation enteritis, are described. The acute symptoms (abdominal pain, loss of appetite, diarrhea) develop within the first hours or days after radiation therapy and can be treated medically. Chronic radiation enteritis leads to a chronic sub-obstructive and/or malabsorption syndrome developing at least two months after the end of radiation therapy. Cases occurring 30 post-radiation are reported. Treatment is surgical with extended resection of all involved elements of the digestive tract and ileocolonic anastomosis in healthy zones. The diagnosis is confirmed by the anatomopathology report of fibrous intestinal lesions associated with obliterating arterial lesions.

Giant colon diverticulum.

Giant colonic diverticulum is defined by a diverticulum whose diameter is greater than 4 cm. This is a rare entity, arising mainly in the sigmoid colon. The diagnosis is based on abdominal computed tomography that shows a gas-filled structure communicating with the adjacent colon, with a smooth, thin diverticular wall that does not enhance after injection of contrast. Surgical treatment is recommended even in asymptomatic diverticula, due to the high prevalence and severity of complications. The gold standard treatment is segmental colectomy. Some authors propose a diverticulectomy when the giant diverticulum is unique.

Efficacy of sacral nerve stimulation for poor functional results of J-pouch ileoanal anastomosis.

PURPOSE: Ileoanal anastomoses (J-pouches) are an alternative to permanent ostomy. The functional outcomes associated with the use of J-pouches are usually good, but continence disorders persist in a significant number of cases and have a negative impact on quality of life. The aim of this study was to assess the efficacy of sacral nerve stimulation (SNS) for poor functional results after J-pouch ileoanal anastomosis. METHODS: Patients suffering from severe fecal incontinence (FI) following coloproctectomy underwent a staged implant SNS procedure. Demographic data and functional results for FI episodes, urgencies per week, frequency of stools, ability to defer defecation, and Wexner scores were obtained at specified intervals. Patients also completed quality-of-life assessments. RESULTS: Four female patients were included in this analysis. All 4 experienced active and passive FI at baseline and subsequently underwent test stimulation with a 75 % success rate. Three received definitive implants. These 3 patients experienced improvement in functional outcomes at 1, 3, and 6 month assessments. Improvements in quality of life were also noted. CONCLUSIONS: Our preliminary study suggests that SNS is effective for the treatment of poor functional results following J-pouch ileoanal anastomosis; however, larger studies with long-term follow-up are needed for confirmation of our findings.