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中国油料作物学报 ›› 2019, Vol. 41 ›› Issue (3): 415-.doi: 10.7505/j.issn.1007-9084.2019.03.014

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Resistance evaluation and yield loss of peanut lines to peanut stem rot caused by Sclerotium rolfsii

  

  1. Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Wuhan 430062, China
  • Online:2019-06-28 Published:2019-09-02

Abstract:

Ten peanut lines developed by Oil Crops Research Institute (CAAS, Wuhan, China) were evaluated for resistance and yield loss to peanut stem rot caused by Sclerotium rolfsii under natural disease condition and by artificial inoculation. The results indicated that the wilting rates of these lines ranged from 11.0% to 50.0% under natural disease condition and 7 lines had the wilting rates lower than 30.0%. Peanut yield and wilting rate were significantly negative correlated (r = - 0.72, P<0.05). The wilting rates of these lines (from 66.1% to 94.0%), at two weeks post inoculation in the artificial inoculation experiment, were lower than those (from 66.1% to 97.4%) before harvest, all these lines were susceptible to infection by S. rolfsii. The peanut yield was negatively related with wilting rate by artificial inoculation with the correlation coefficient of -0.85 (P<0.05). The peanut yield loss was higher than 91.7% for the least susceptible line after artificial inoculation. One tolerant line 16-A13440 was identified.