جستجوی مقالات مرتبط با کلیدواژه « Tolerance » در نشریات گروه « اقتصاد کشاورزی »

This study was performed to answer the questions about the possibility of finding genetic sources of resistance to damping off in safflower. To do this, response of 15 genotypes of safflower to P. ultimum was evaluated in research farm of Agricultural science and Natural resources university of Gorgan between 2009-2010. The experiment was done as a split plot arranged in a randomized complete block design with two levels of sterility (sterile and non-sterile) as main plot, and 15 safflower genotypes as sub plot. For inoculation, pieces of fungi in sterile sand along with zoospores suspension at concentration of 105 per ml were used. The results showed that 10 genotypes had resistance more than 90%. Among them resistance of higher than 98% were observed in two genotypes, viz. LRV-55-255 and 34040. The results obtained revealed that infection caused by P. ultimum was effective on speed of emergence in the field. Genotypes grouping showed that genotypes of the third group (Zaeghan-259 and 34040) were relatively resistant.

In order to investigation intra specious variation to salinity tolerance in wheat gene expression patterns were compared in salt tolerant and sensitive wheat under control and stress conditions. Reverse northern blot technique was used to compare gene expression patterns. To simplify، sixteen gene expression patterns were considered in salt tolerant and sensitive genotype in control and stress conditions. The gene expression patterns of the studied genes were located in ten out of sixteen gene expression patterns. The most important expression patterns were number 2، 6، 8 and 12. More genes were placed in the expression pattern of the number 2 than to other expression patterns. The majority of the transcription factor expressions were located in the four above gene expression patterns. Seven genes up regulated in both sensitive and tolerant genotypes in the present of salt stress. In the current study، four genes were selected as long term salt tolerant candidate genes in Mahooti cultivar including LEA، CBEFP، bZIP5 and wsr3 genes from second، sixth، eighth and twelfth expression patterns، respectively. The results also indicated that a larger number of salt responsive transcripts were expressed in tolerant genotype. These results show that differences in the gene expression patterns in varieties within species may produce salt stress tolerant and sensitive genotypes.