Saeideh Javid; Mohammadreza Bihamta; Mansour Omidi; Alireza Abbasi; Hadi Alipour
Abstract
Given the importance of salinity at the germination stage, this study was carried out with the aim of investigating the diversity of germination traits in bread wheat 91 cultivars and 204 landraces along with three control varieties (Sistan, Narin, and Arg) under salinity (60 and 120 mM NaCl) ...
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Given the importance of salinity at the germination stage, this study was carried out with the aim of investigating the diversity of germination traits in bread wheat 91 cultivars and 204 landraces along with three control varieties (Sistan, Narin, and Arg) under salinity (60 and 120 mM NaCl) as a factorial experiment in a completely randomized design with two replicates in petri dishes. There was a high diversity between wheat genotypes in terms of shoot and root length of seeding, shoot-to-root length ratio, germination index, and seed vigor under both sat stress conditions; while germination energy and germination percentage had low variation. There was a positive significant correlation between all the traits (except the root length of seeding and the shoot-to-root length ratio) under all three conditions (control, 60 and 120 mM NaCl). From the factor analysis, the PC1 and PC2 under 60 mM NaCl treatment were named as seedling weight and germination percentage, respectively. Under 120 mM NaCl treatment, PC1 and PC2 were named as germination percentage and seedling weight, respectively. Based on the biplot, IP624925, IP628189, and IP624838 landraces and ADL, AFLAK, KHAZAR1, and RIJAW cultivars were identified as superior genotypes under 60 mM NaCl treatment. Moreover, IP627103, IP624596, IP626566, IP625433, and IP628189 landraces and Shiroodi and Dastjerdi cultivars were selected as superior genotypes under 120 mM NaCl treatment. Overall, the selected genotypes were identified as genetic material with the potential of salinity tolerance based on multivariate statistical analysis.
Mahboubeh Hajiabbasi; Reza Tavakkol afshari; A.R. Abbasi; Reza Kamaei
Abstract
Glycine max is an important oilseed crop in all of the world. One of the problems of the G. max production is seed deterioration during seed storage, resulting in low germination and vigor before planting. In order to investigate the effects of ethylene and salicylic acid on the improvement of deteriorated ...
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Glycine max is an important oilseed crop in all of the world. One of the problems of the G. max production is seed deterioration during seed storage, resulting in low germination and vigor before planting. In order to investigate the effects of ethylene and salicylic acid on the improvement of deteriorated soybean seed, accelerated aging tests were conducted for 0, 6 and 10 days and natural aging test for 6 months. After the aging conditions, seeds were imbibed by 50 mM salicylic acid and 10 mM ACC (precursor of ethylene) for 6 hours at 25 °C. Also, a batch of the seed was used after the natural and accelerated aging tests without any hormonal treatment as a control (called dry seeds). Germination percentage, electrical conductivity and gene expression of AMY1, BMY1 were investigated in the dry seed, imbibition of water, salicylic acid and ACC at 6, 12 hours by the qRT-PCR method. The seed germination decreased and electrical conductivity increased with the progress of the aging. Gene expression varied in different days and hours. Salicylic acid and ACC had different effects on measured traits. The highest germination rate was observed in non-aged dry seeds (95%). On the other hand, ACC and salicylic acid failed to change seed germination of 10-day aged seeds. Moreover, the highest electrical conductivity (53 µScm-1gr-1) was in 10-day aged seeds affected by SA. The expression of AMY1 and BMY1 genes increased coincide with the age levels. Salicylic acid reduced the expression of AMY1 in non-aged seed, implicated that salicylic acid works as a stress factor in non-aged seeds. The expression of AMY1 gene in the non-aged seeds was 1.8, while it was 3.3 in 10-aged seed. Overall, aging caused disturbing of seed physiology and salicylic acid and ACC were not able to improve germination of deteriorated soybean seed
