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Showing 2 results for Seedling Emergence
Effect of hydro and hormone priming with gibberellin on germination, seedlings emergence and some growth characters in two Alhagi species (Alhagi graecorum Khuzestan ecotype and Alhagi maurorum Esfahan ecotype) under saline conditions of using seawater of Persian Gulf
Farzaneh Amirikia, Majid Nabipour, Masoumeh Farzaneh,
Volume 10, Issue 1 (9-2023)
Abstract
Extended Abstract
Introduction: The use of seed priming technology to accelerate the germination and seedling emergence of multi-purpose plants such as halophytes (Alhagi) with the ability to produce medicine and forage under environmental stress conditions or use of saline water (such as seawater of Persian Gulf) has received much attention today. Therefore, the present study was conducted to investigate seed priming methods and different salinity levels on germination, seedling emergence, and some growth responses of Alhagi plant.
Material and Methods: Two separate split-factorial experiments were conducted based on a randomized complete block design with four replications as a petri dish culture (first experiment) and a pot experiment in the field was performed in the Department of Plant Production and Genetics, Faculty of Agriculture, Shahid Chamran University (Ahwaz, Iran) during 2020-21. In both experiments, different levels of salinity (municipal water source with EC=0.96 dS.m-1, 8 and 16 dS.m-1 using seawater of Persian Gulf) were assigned as the main plot, and different methods of seed priming (non-priming, hydro priming, hormonal priming with 50 ppm gibberellin and hydro priming+hormonal priming with 50 ppm gibberellin) and species (A. maurorum and A. graecorum) were assigned as sub-factors.
Results: The results showed the significance of salinity × species × priming interaction on all studied traits. According to the mean comparison results, the highest values of germination percentage, seed vigor index, seedling emergence, plant height, number of branches, total dry matter and stomatal conductance were obtained from a municipal water source with EC=0.96 dS.m-1 and hydro priming+hormonal priming with 50 ppm gibberellin for A. graecorum (29.1, 90.2, 24.0, 32.3, 52.5, 52.1 and 32.4% increase compared to non-priming and control salinity stress on this species, respectively). The output of the fitted logistic model to seedling emergence percentage showed that this model well explained the relationship between seedling emergence of two Alhagi species in responses to salinity and seed priming (R2 adj≥0.98 and RMSE≤3.38). Therefore, in both studied species, the decline in seedling emergence started from the 8 dS/m salinity level. However, at the 16 dS/m salinity level, the slope of increase in seedling emergence percentage was slower per time unit.
Conclusion: To cultivate and exploit the saline coastal lands and also to restore the pastures in the country, A. graecorum species under the combined treatment of hydro priming + hormonal priming with 50 ppm gibberellin are recommended in comparison with other treatment levels.

Highlights:
1- Germination and growth responses of two Iranian Alhagi species and the possibility of production by irrigation of seawater of Persian Gulf were investigated.
2- Seed priming technique was used to accelerate seedling emergence and improve some traits in two Alhagi species.

Studying the effect of seed production environment and genotype on germination and seedling traits of different single crosses of sugar beet
Mohammadreza Mirzaei,
Volume 11, Issue 2 (3-2025)
Abstract
Extended abstract
Introduction: One of the most important factors in achieving optimal root yield of sugar beet at the time of harvest is proper plant density due to the high field emergence and subsequent seedling growth through the use quality seeds. Of the determining traits the vigor and quality of sugar beet seeds are different seedling traits.
Materials and Methods: For this purpose, the germination vigor and seedling growth rate in laboratory conditions by measuring the traits of maximum germination, hypocotyl length, radicle length, fresh and dry weight of seedling in 10 single cross hybrids along with the male parent produced in three locations was used. Also, the correlation of the mentioned traits with seedling emergence traits in the greenhouse and the chemical traits of sugar beet seed was studied.
Results: The results showed that seedling traits, which are represents trait of the seed vigor, are determined by two factors, seed production environment and genetics. The correlation coefficients between seedling traits in the laboratory with seedling emergence traits in the greenhouse and seed electrical conductivity showed that genotypes with low electrical conductivity and percentage of soluble solids on the pericarp of sugar beet seeds, germinated faster in greenhouse conditions and mean emergence time was decreased. Therefore, high level of electrical conductivity of sugar beet seed pericarp was associated with low seed vigor.Also, significant correlation was observed seedling emergence rate and mean seedling emergence time in greenhouse with hypocotyl length in the laboratory positive (+0.91**) and negative (-0.82**), respectively. It can be concluded that the genotypes with longer hypocotyl length in the laboratory resulted in faster seedling emergence rate in the greenhouse. Subsequently, single crosses such as MS KWS * OT 231 with greater root length (8.49 cm), seedling length (14.66 cm), and the ratio root length to hypocotyl (1.37) in laboratory conditions, increased the mean dry weight of shoot (1.89 mg) and SVI (8.26) in the greenhouse compared to the single crosses others were accompanied.
Conclusions: Therefore, it seems that seedling traits and the chemical characteristics of sugar beet seeds to predict the emergence of seedlings in greenhouse and perhaps in the field are recommended. However, in order to accurate validation and evaluation, it is recommended that the aforementioned experiment be conducted under field conditions.

Highlights:
  1. There were differences between the genotypes in terms of seed characteristics and the maternal environment in which the seeds were grown.
  2. Poor vigor and seed performance can reduce the percentage of seedling emergence potential as well as the rate and uniformity of seedling emergence compared to high vigor seeds.
  3. Seedling traits in sugar beet are traits of the seed vigor that are influenced by the sugar beet seed production environment and genetics.

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