Improvement and breeding
P. Yari; R. Aminian; A.H. Keshtkar; H. Bagheri; S. Mafakheri
Abstract
Tragopogon spp. has many medicinal properties in addition to its edible consumption due to its many useful compounds. One of these identified compounds is inulin, which is present in the roots of this plant. To investigate the effects of low irrigation stress and growth-promoting rhizobacteria (Bacillus ...
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Tragopogon spp. has many medicinal properties in addition to its edible consumption due to its many useful compounds. One of these identified compounds is inulin, which is present in the roots of this plant. To investigate the effects of low irrigation stress and growth-promoting rhizobacteria (Bacillus subtilis) on inulin content and root morphological traits in some genotypes of Tragopogon spp., a factorial experiment with three factors in a completely randomized design with three replications was conducted in the research greenhouse of Bu Ali Sina University in 2020. The factors included irrigation at two levels of without stress (100% of field capacity) and low irrigation stress (50% of field capacity) as the first factor, genotype at 15 levels (different genotypes of Tragopogon spp) as the second factor, and plant growth-enhancing rhizobacteria (PGPR) at two levels of inoculation with B. subtilis and without inoculation as the third factor. Length, area, volume, diameter, weight, and inulin content of the plant roots were measured. The results showed that the irrigation × genotype × bacteria interaction effect was significant on all studied traits. Low irrigation stress increased length, area, and volume of the plant roots in most genotypes, but decreased root weight and inulin content. Inoculation with B. subtilis affected genotypes differently. Iranian genotype No. 11 (Kaboudar Ahang) had the highest inulin content at different stress and B. subtilis levels, followed by Italian genotype No. 4 at both B. subtilis levels under non-stress conditions. Overall, stress reduced inulin content of the plant roots, but the effect of inoculation with B. subtilis depended on the genotype.
S. Mafakheri; R. Aminian
Abstract
Though chemical fertilizers increase crop production, their long-term use causes soil compaction and decreased fertility, increased air and water pollution, as well as increased greenhouse gases emission, ultimately leading to serious damage to human health and the environment. A greenhouse experiment ...
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Though chemical fertilizers increase crop production, their long-term use causes soil compaction and decreased fertility, increased air and water pollution, as well as increased greenhouse gases emission, ultimately leading to serious damage to human health and the environment. A greenhouse experiment was conducted during 2018 to evaluate the effects of chemical and bio-fertilizers on the quality and quantity of Coriander (Coriandrum sativum L.) in a randomized complete block design with four treatments. The experimental treatments included chemical fertilizer (NPK), seaweed extract, humic acid, and control (without fertilizer) with five replications. The results showed that the treatments had a significant effect on most of the traits. The highest plant height, plant dry weight, number of umbels per plant, number of seeds per plant, 1000 seed weight, number of primary branches, chlorophyll content, leaf carotenoid content, and essential oil content were obtained in the plants treated with chemical fertilizer as well as seaweed extract. The highest plant fresh weight was obtained from chemical fertilizer treatment, and the highest number of secondary branches (9.08) and linalool percentage (61.32%) were obtained from the seaweed extract treatment. The results indicated that the seaweed extract could be a good replacement for chemical fertilizers in coriander.
