جستجوی مقالات مرتبط با کلیدواژه « seedling growth » در نشریات گروه « آب و خاک »

In order to investigate the reaction of sunflower recombinant inbred lines to salt stress in seedling stage, a factorial experiment based on randomized complete block design was implemented in controlled condition. The first factor consisted of 77 recombinant inbred lines (generation F9) and the second factor was salinity stress with NaCl (salinity levels 0 and 6 dS m-1) and traits including shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight and root dry weight were measured. Results of analysis of variance revealed that all studied traits influenced by genotype, salinity and genotype×salinity interaction. 33 lines out of 77 lines (43%) in salinity level of 6 dS m-1 could not germinate and 44 lines out of 77 lines (57%) could maintain their viability. Mean values of all of studied traits were decreased in salinity level of 6 dS m-1 compared to normal conditions. Clustering of genotypes was performed using the studied traits in each condition by squared Euclidean distance criteria and Ward algorithm. Studied lines were grouped in three classes. In normal conditions, 17, 18 and 42 lines were located in cluster one, two and three, respectively, while, in salinity conditions, 26, 8, and 9 lines were classified in above mentioned groups. Maximum distance was observed between cluster 1 and cluster 2. Results of cluster analysis were in coincidence with those obtained by principle component analysis and discriminant function analysis. Line C86 was possessed maximum values of studied traits and hence, present as salinity tolerant line.

Soil salinity is an increasing environmental stress on crops in most areas of Iran since farmers use underground saline water for irrigation. In order to investigate the effects of salt stress on germination and seedling growth of safflower (Carthamus tinctorius L.), an experiment was conducted at two stages (germination seedling growth), using four levels of NaCl salinity (0, 5, 10, 15 ds/m), and four cultivars of spiny and non-spiny safflower ( a landrace from Isfahan bred cultivars of IL, LRV and PI). The design was factorial and completely randomized based on 3- replicates (CRD). Germination percentage, germination velocity index, root and shoot length, root and shoot dry weight, root to shoot dry weight ratio and salt tolerance index were measured at germination stage. In seedling growth stage, traits such as, stem length, number of leaves, chlorophyll index, root and shoot dry weight, root to shoot dry weight ratio and salt tolerance index were also measured. Results for both growth stages showed that salt stress decreased all the above mentioned traits, significantly, in all cultivars. Salinity × variety interaction at germination stage was also significant, compared to seedling growth stage. Salt tolerance index decreased significantly with increasing salinity at both stages, but differences between cultivars were not significant. Cultivars PI and IL were characterized as the tolerant ones at germination and seedling growth stages, respectively. It could be concluded that safflower cultivars responded differently to salinity in germination phase compared to seedling growth phase, and that safflower suffers more from salinity during germination stage.