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Introduction and Comparison of Tolerance of 10 Gladiolus communis L. hybrids to the population of Tetanychus urticae Koch
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Asghar Hosseininia *   , Zahra Mojib-Hagh ghadam , Mohamad Hossein Azimi , Mazaher Yosefi , Anoushe Yousefbeiki , Abbas Shahriari |
| Department of Technology and Production Management, Ornamental Plants Research Center (OPRC), Horticultural Sciences Research Institute (HSRI), Agricultural Research, Education and Extension Organization (AREEO)gricultural Research, Education and Extension Organization (AREEO) & Agricultural Research, Education and Extension Organization (AREEO)gricultural Research, Education and Extension Organization (AREEO) |
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Abstract: (58 Views) |
The Gladiolus is one of the most important bulbous flowers. Modifying and introducing new Gladiolus codes along with innovation is very important. Four cultivars of Amsterdam, Whitepraspree, Adonis Red and Rosesoprim were used as parents for hybridization and were evaluated in the research greenhouse of the Flower and Ornamental Plants Research Institute. From 48 progeny (OPRC1 to OPRC48 codes), 10 promising hybrids were selected and the resistance, susceptibility and tolerance to the two-spotted spider mite were investigated by plant resistance index method. With this index, three resistance assessments (antixenosis, antibiosis, and tolerance) were simultaneously analyzed. In the tolerance evaluation of 10 selected hybrid codes, after keeping 100 female mites on each plant, apparent damage was determined from the scale (1-6). Mites of the same age were used to evaluate antibiosis. On each leaf of each bush, an adult female mite was released. Events were recorded for 30 days and the number of offspring born was counted and innate reproductive rate was calculated and considered as the antibiosis effect of the hybrids. Plant resistance index using the formula (PRI)=1.XYZ, in which (PRI) was the plant resistance index, X: antixnose index (number of Mites counted after 72 hours), Y: antibiosis index (intrinsic rate of population growth), and Z: tolerance index based on the scale (1-6). The results showed that the hybrid code (3-5) showed the highest non-preference, followed by the hybrid code (4-1) and (9-8) in the next groups. As a result of the tolerance evaluation, Yellow-2 and (9-11) hybrids showed the highest tolerance against 30 female mites per leaf unit and were placed in the first and second groups. Antibiosis results showed that the yellow-2 and Red-1 hybrids were divided into the first and second groups and had the highest antibiotic effect. Based on the Resistance Index (PRI), the highest resistance to the two-spotted spider mite was estimated for the Yellow-2 hybrid code.
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| Keywords: Gladiolus, Hybid, Resistance, Tetranychus urticae |
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Type of Study: Research |
Subject:
Special
Received: 2025/01/12 | Accepted: 2025/09/18 | Published: 2026/01/29
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