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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2013年50 No.1

Differences in the physiological response of resistant and susceptible rice varieties infested by the small brown planthopper
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Abstract:        The small brown planthopper (SBPH), Laodelphax striatellus Fallén (Homoptera: Delphacide), is a serious pest of rice (Oryza sativa L.) in China. To elucidate the physiological basis of the resistance of rice to SBPH, we measured some physiological indices in rice seedlings infested by 0, 5, 10 and 20 of these pests per seedling for 3 d and 6 d. The results show that although chlorophyll, soluble sugars and protein tended to decrease in all the tested rice varieties this trend was much greater in the susceptible than in the resistant varieties. Levels of chlorophyll, soluble sugars and protein in susceptible varieties were significantly different at different densities and durations of SBPH infestation. Rice seedlings of the Wuyujing 3, Kinmaze, DV85 and Mudgo varieties infested by 20 SBPH per seedling for 6 d displayed a decrease in chlorophyll content of 460%, 46.0%, 2.3% and 2.1%, respectively whereas soluble sugars in the above four varieties decreased by 55.5%, 46.3%, 9.2% and 11.7% and soluble protein by 22.3%, 29.5%, 8.5% and 6.7%, respectively. The activity of peroxidase (POD) significantly increased and that of catalase (CAT) decreased with increasing density and duration of SBPH infestation in all four rice varieties. Defensive enzymes increased in response to SBPH infestation significantly earlier in resistant than in susceptible varieties. Free proline and malondialdehyde (MDA) increased with the density and duration of SBPH infestation in all four varieties. Howev
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