Archives-June 2020

The aim of this investigation was the ability of different indices to identifies drought resistant genotypes of cotton under normal and stress conditions. Thirteen drought tolerance indices i.e., stress susceptibility index (SSI), tolerance index (TOL), mean productivity index ( MP), geometric mean productivity (GMP), stress tolerance index (STI), yield index (YI), yield stability index (YSI), drought resistance index (DI), yield reduction ratio (YR), a biotic tolerance index (ATI), stress susceptibility percentage index (SSPI), harmonic mean (HM) and golden mean (GOL) were calculated based on seed cotton yield/plant under normal (Yp) and stress (Ys) conditions for 24 cotton genotypes over the two summer seasons (2015 and 2016) at Sakha Agriculture Research Station, Agriculture Research Center, Kafr El-Sheikh, Egypt. The values of mean performances showed that, most studied genotypes were better than the grand mean during Yp and Ys. Drought stress reduced the studied traits while other was tolerant to drought, suggesting genetic variability in 24 cotton genotypes for drought tolerance. According to drought tolerance indices, MP, GMP, STI, YI and HM under Yp and Ys as well as the other studied drought tolerance indices under Ys could properly distinguish drought tolerant cotton genotypes with high yield performance. Therefore, the indices of MP, GMP, STI, YI and HM were considered as a better predictor of Ys and Yp than the other indices. Screening drought tolerant genotypes using mean performances and drought tolerance indices showed cleared that the genotypes G.94, G.86, G.96 and G.89 were the most drought tolerant under Yp and Ys. Thus, they are recommended to be used as a parents for improvement of drought tolerance of cotton in breeding and hybridization programs in Egypt to produce and select a new recombination’s are more and more tolerant for drought to overcome the water shortage and reduce the water rating of the cotton crop. And the possibility of planting and expansion of those new recombination’s under the conditions of new lands that suffer from shortage of water and access to an economic crop. Cluster analysis based on all studied traits of 24 cotton genotypes into five and nine clusters under normal and drought stress conditions, respectively .The results for cluster analysis suggested that these genotypes could be used as a source of germplasm for breeding for drought tolerance and also cleared that the hybridization between clusters may increases variability and expected transgresive segregation to select the new germplasm had more and more drought tolerance. 

Solid pseudo papillary neoplasm of the pancreas (SPNs) is a rare entity, known for its indolence. The pathogenesis of these tumors still controversial. Classic imaging characteristics include a large size, mixed density with solid and cystic components, encapsulation and hemorrhage. SPNs can show several criteria of malignancy such as local invasion, metastases and recurrence. Radical surgery is usually curative. We present a case of a Frantz Tumor in a 15-year-old female, with typical imaging features.

Table of contents for the month of June 2020