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Effect of early and conventional sowings on soybean establishment quality, nodulation and early biomass development under inoculation with Rhizoctonia solani

Abstract : Early sowing has potential to reduce negative impacts of summer drought on soybean productivity in southern Europe. However, performing early sowing into cool and moist soil conditions may increase risks of soil-borne pathogens that cause damping-off disease. We investigated whether and to what extent soybean germination, emergence, nodulation, and early biomass growth was affected when inoculated with Rhizoctonia solani, an important causal agent of damping-off disease. We conducted this study through four complementary approaches: i) in vitro laboratory tests, ii) field experiments including two sowing dates (early and conventional), iii) growth chamber experiments, and iv) modeling. The pathogen caused disease symptoms and significantly reduced (p≤0.001) radicle growth in vitro but failed to cause disease under field or growth chamber conditions. No biological suppressiveness of the field soil to R. solani was found when tested under the growth chamber. The final field emergence rates ranged from 72% to 92% for early and conventional sowing, respectively while those in the growth chamber ranged from 80% to 100%. Under field conditions, abiotic stresses were the major causes of non-emergence while biotic stresses had only minor impact on seedling emergence. Significant effect of sowing date (p<0.001) was observed on the average shoot and root length, and on the number of average nodules per plantlet. The overal prediction quality of the SIMPLE model was very good for both sowing dates. The contrast between laboratory and field experiments, in terms of disease development, time to emergence, and early growth parameters are discussed.
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https://hal.inrae.fr/hal-03287571
Contributor : Jay-Ram Lamichhane <>
Submitted on : Thursday, July 15, 2021 - 5:10:14 PM
Last modification on : Monday, July 19, 2021 - 3:40:02 PM

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Jay-Ram Lamichhane, Jean-Noël Aubertot. Effect of early and conventional sowings on soybean establishment quality, nodulation and early biomass development under inoculation with Rhizoctonia solani. PhytoFrontiers™, In press, 43p. ⟨10.1094/PHYTOFR-12-20-0046-R⟩. ⟨hal-03287571⟩

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