Research Paper
Molecular Plant Breeding
Maryam Farsi; Mehrshad Zinolabedini; Mansoor Kalantar; Mohammad Reza Vazifeshenas; Reyhaneh Asgarpour
Abstract
Pomegranate is a valuable fruit tree that exhibits favorable genetic diversity in Iran. The investigation of genetic diversity is the basis of plant breeding and is of particular importance. For this purpose, 38 morphological and pomological traits of 30 pomegranate genotypes were evaluated over two ...
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Pomegranate is a valuable fruit tree that exhibits favorable genetic diversity in Iran. The investigation of genetic diversity is the basis of plant breeding and is of particular importance. For this purpose, 38 morphological and pomological traits of 30 pomegranate genotypes were evaluated over two consecutive years. The results indicated that the genotypes displayed a high diversity in the studied traits, with the exception of the presence of anthocyanin in the branch of this year, aril color, fruit size, fruitful flower size, and intermediate cut of the leaf. The physiological disorder of fruit skin sensitivity to bursting had a positive correlation with fruit skin sensitivity to sunburn, but it showed a negative relationship with fruit skin thickness and tree mean yield. A positive correlation was observed between fruit size and fruitful flower size, and between fruitful flower percentage and flower position. The results of the principle component analysis revealed that the characteristics of fruit skin sensitivity to bursting, tree mean yield, fruit skin thickness, flower position, and fruit shape were the most key traits in determining the diversity between the studied genotypes. Based on the results of cluster analysis, the genotypes were divided into three groups, and the first group included genotypes with the lowest fruit skin sensitivity to bursting and sunburn. Among the cultivars studied, Rabab Malas Fars, Garch-shahvar, Shahvar-ghasrdasht, and Malas-Yazdi could be considered superior and desirable cultivars due to their low sensitivity to bursting and sunburn, as well as their high fruit number and tree yield
Research Paper
Molecular Plant Breeding
Zeinab Chaghakaboodi; Seyed Hasan Mousavi; Mahdi Kakaei
Abstract
Brassinosteroids are steroid hormones that are essential for the growth and development of plants and play a significant role in plant responses to stress. This study delves into examining how 24-epibrassinolide influences seedling indices, physiological and biochemical traits in specific lettuce genotypes ...
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Brassinosteroids are steroid hormones that are essential for the growth and development of plants and play a significant role in plant responses to stress. This study delves into examining how 24-epibrassinolide influences seedling indices, physiological and biochemical traits in specific lettuce genotypes under drought stress. The factorial experiment was conducted using a completely randomized statistical design with four replicates at the research laboratory of plant physiology, Faculty of Agriculture, Agriculture and Natural Resources Campus, Razi University, Kermanshah, Iran in 2023. The experiment included two selected lettuce genotypes, namely Icy and Romance, as the first factor. The second factor comprised seed pretreatment at four levels of priming with 24-epibrassinolide (0, 50, 100, and 150 μM), while the third factor consisted of drought stress at four levels (0%, 10%, 20%, and 30%) induced by mannitol. The assessed traits encompassed germination rate, root length, stem length, Relative Water Content (RWC), total sugar content, total phenol content, and flavonoid content. Comparative analysis of average traits revealed that the levels of biochemical traits, specifically total sugar (0.480 mg/l), phenol (460.83 mg/l), and flavonoid (1.047 μg/l), escalated with higher levels of drought stress. Principal component analysis indicated that the first two components elucidated 64% of the variations. The findings suggest that priming with 150μM of 24-epibrassinolide hormone is advisable to attain the highest seedling indices in lettuce. According to the results obtained in this research, the Roman line is introduced as the best line in drought stress conditions.
