جستجوی مقالات مرتبط با کلیدواژه "iceberg" در نشریات گروه "باغبانی"

In this study, lettuce cultivars and genotypes native to the country, including two domestic cultivars and six domestic genotypes along with five iceberg lettuce genotypes were evaluated for production in greenhouse conditions. Evaluation was performed in the research greenhouse of the Horticultural Sciences Research Institute in Karaj. The greenhouse experiment was carried out in a randomized complete block design with three replications in spring of 2018. In this study different indices including, number of leaves, leaf length and width, head length and diameter, depth of incisions leaf, , head firmness and yield and qualitative indices like leaf color, texture tenderness, the presence of anthocyanin and maturity were measured. Data were analysed with SPSS ver.16, means comparison was done with Duncan test. Correlation of quantitative traits with yield was done by person test and regression of independent variables with yield was done by linear stepwise method. Results showed a significant positive correlation between the yield and variables including head length and diameter, leaf length and width, leaf numbers. So that, Grizzly cultivar and Borazjan accession with the most head and leaves’ length and diameter had the highest yield in the experiment. Linear regression of the traits with yield revealed that only head’s length had the significant effect on the yield. There were variations in quantitative traits and maturity between accessions and cultivars. The cultivars Bombola, Grizzly, Borazjan, Peache-Ahvaz and Varesh had the good marketable, taste and flavour. Altogether, the superior accessions and cultivars such as Bombola, Grizzly, Borazjan, Peache-Ahvaz and Varesh for using in breeding program or cultivation under greenhouse condition were selected.

Nitrate uptake in plants is very important due to environmental concerns and the quality of agricultural products. On the other hand, photosynthetic efficiency is considered as the principal indicator of plant growth and yield, therefore the ability to sustain crop stability in different environmental conditions is crucial. In this study, some physiological characteristics and nitrate accumulation were investigated using γ-aminobutyric acid (GABA) and calcium lactate in lettuce of Dimayo cultivar. For this purpose, GABA solutions with three concentrations (0, 0.5 and 1.5 mg/l) and calcium lactate with three concentrations (0, 1 and 2 %) and their interaction were used, as foliar spraying during two times including after seedling transplant and two weeks later. This factorial experiment was performed in a completely randomized design in the greenhouse. GABA treatment of 1.5 mg/l + calcium lactate 2% showed the highest yield, total chlorophyll and relative water content. However, the highest ion leakage and nitrate accumulation were obtained in the leaves of control plants. Also, the lowest amount of nitrate accumulation was measured in GABA treatment with a concentration of 1.5 mg/l, which reduced the amount of nitrate accumulation compared to control plants by four times.