Rice cultivars affect fitness-related characteristics and digestive physiology of the rice weevil,Sitophilus oryzae (L.) (coleoptera: Curculionidae) |
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| Affiliation: | 1. AICRP on PHET, College of Agricultural Engineering & Technology, Odisha University of Agriculture & Technology, Bhubaneswar, Odisha, 751003, India;2. Post Harvest Process and Food Engineering, College of Agriculture, Jawaharlal Nehru Agricultural University, Tikamgarh, Madhya Pradesh, 472001, India;1. College of Food and Health, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China;2. Academy of National Food and Strategic Reserves Administration, Beijing, 100037, China;1. Kulumsa Agricultural Research Center, P. O. Box 489, Asella, Ethiopia;2. Department of Grain Science and Industry, Kansas State University, Manhattan, KS, 66506, USA;3. Holeta Agricultural Research Center, Holeta, Ethiopia;5. Department of Biological and Physical Sciences, South Carolina State University, Orangeburg, SC, 29117, USA;4. Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, Ethiopia;6. Department of Dryland Crop and Horticultural Science, Mekelle University, Mekelle, Ethiopia;1. Department of Agroindustrial Science and Technology, Federal University of Pelotas, 96010–900, Pelotas, RS, Brazil;2. Technological Institute in Food for Health, University of Vale do Rio dos Sinos, 93022-750, São Leopoldo, RS, Brazil |
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| Abstract: | The rice weevil, Sitophilus oryzae (L.), is one of the main pests of rice and other stored grains. Due to the negative effects of synthetic pesticides on the environment and non-target organisms, more environmentally benign alternative control techniques are needed for controlling pests. In the present study, the development, reproduction, and digestive enzyme activity of Sitophilus oryzae (L.) were evaluated on 12 rice cultivars under laboratory conditions 28 ± 1 °C, 60 ± 5% RH, and a photoperiod of 16:8 (L: D) h]. Among tested rice cultivars, the developmental time of S. oryzae immature stages was the shortest on DomSiah (33.0 days), Hashemi var. Guilan (34.0 days) and Hashemi var. Mazandaran (34.0 days) and the longest on Neda (44.5 days). The highest fecundity was recorded for beetles reared on cultivars DomSiah (316.8 eggs), Hashemi var. Mazandaran (301.1 eggs), and Hashemi var. Guilan (293.3 eggs); and the lowest for beetles reared on cultivar Neda (147.0 eggs). The highest survival of immature stages was recorded on cultivars Hashemi var. Mazandaran (80.0%), AliKazemi (75.2%), DomSiah (73.6%), and Hashemi var. Guilan (71.0%) whereas those on cultivar Neda (25.3%) had the lowest survival. The female adults that developed from larvae reared on cultivars Neda, Govhar, and Fajr had the lowest body mass (67.7, 68.6, and 69.4 mg). Also, the males’ mass was the lowest on cultivars Neda, Fajr, Shiroudi, and Govhar (60.7, 62.2, 62.9 63.3 mg, respectively). The adults developed from larvae reared on cultivars Fajr and Neda had the lowest levels of α-amylase activity (1.77 and 1.64 mU/min/individual, respectively). Also, those reared on cultivar Neda had the lowest levels of protease activity (0.067 OD/min/individual). Results suggest cultivar Neda, as an unsuitable food for S. oryzae development that negatively affects the amylolytic and proteolytic activity of this pest, could be considered in the integrated management programs of this pest. |
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| Keywords: | Developmental time Survival Body mass Amylolytic activity Proteolytic activity |
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