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Induced resistance of cucumber seedlings caused by some non-pathogenicRhizoctonia (np-R) isolates

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Abstract

Among 153 isolates ofRhizoctonia spp. obtained from 95 soil samples collected from different fields in the USA, 42 (27.5%) isolates were hypovirulent or non-pathogenic on cabbage (tested on tap water agar plus 250 μg/ml chloramphenicol plates). Of these, 14 (33.3% of the np-R) isolates protected >60% of the cabbage seedlings againstR. solani, and the best eight isolates protected 73–95% of the cucumber seedlings. The np-R isolates RU56-8 (AG-P) and RU89-1 [AG-B(o)] induced the highest resistance against hypocotyl challenge inoculation with virulentR. solani (38.3–85.7%), whereas most of the challenged control seedlings (85–100%) collapsed. Similarly, isolates RU56-8 and RU89-1 induced the highest resistance (22.2–87.5%) against hypocotyl challenge inoculation withPythium aphanidermatum, whereas most of the challenged control seedlings collapsed (90–100%). Isolates RU56-8 and RU89-1 significantly reduced the lesion numbers and area/leaf (to 8.9–42.0% of the control) caused by challenge inoculation of the first true leaves withPseudomonas syringae pv.lachrymans. No np-R isolate could be recovered from the upper hypocotyls or from the leaves, indicating that there was no contact between the inducer and the pathogen. Root colonization with some np-R increased seedling tolerance to low soil moisture levels.

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Authors and Affiliations

  1. Dept. of Plant Sciences and Inst. for Nature Conservation Research, The George S. Wise Faculty of Life Sciences, Tel-Aviv University, Ramat Aviv, 69978, Tel Aviv, Israel

    Meira Ichielevich-Auster

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  1. Baruch Sneh
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  2. Meira Ichielevich-Auster
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Correspondence to Meira Ichielevich-Auster.

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Sneh, B., Ichielevich-Auster, M. Induced resistance of cucumber seedlings caused by some non-pathogenicRhizoctonia (np-R) isolates. Phytoparasitica 26, 27–38 (1998). https://doi.org/10.1007/BF02981263

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