een12017-sup-0001-FigS1.docWord document27KFig. S1. Figures illustrating experimental setup of field experiment. (A) A block set up with four rows down representing four maturity groups, and six rows across with the central four rows representing different genotypes within a maturity group; the two outermost rows represent a border genotype of the same maturity group. Entire blocks experienced either suppressed insects or ambient plus added insect herbivory, crossed with suppressed water (drought) or water irrigation to mimic typical ambient conditions. (B) Dripperline attached to PVC at the top of a block to deliver water to irrigated blocks. (C) Dripperline in U-formation at the bottom of blocks allowed delivery of water to all plants. (D) Plastic sheeting over a block to control rainfall; the field was sloped slightly downwards in the direction of the photograph, such that water quickly ran off the plastic to the end of the block. Water above the block was diverted with a trench that is partially visible towards the bottom of the photograph.
een12017-sup-0002-TableS1.docWord document27KTable. S1. Genotype information including genotype means of phenotypic traits and herbivory in each treatment.
een12017-sup-0003-TableS2.docWord document27KTable. S2. Monthly precipitation (cm) measured at the Lake Wheeler Field Laboratory weather station during the experiment in 2010 (June–November). Data presented include monthly total, deviation from the monthly mean, greatest amount of precipitation received in a 24-h period and the day of the month on which that occurred, plus the number of days during each month that 0.25, 1.25, and 2.5 cm or more precipitation fell in 24 h. Note that, although September experienced much higher than average precipitation, most of this occurred at the end of the month.
een12017-sup-0004-TableS3.docWord document27KTable. S3. Effects of drought and soybean genotype on herbivore performance in a detached leaf no-choice bioassay. We used two generalist feeding caterpillars, Helicoverpa zea and Spodoptera exigua and recorded their biomass gain after 7 days of growth starting from a freshly hatched first-instar neonate caterpillar. Caterpillar mass was analysed using the same model as described for percentage herbivory, while we used generalized linear models with a binomial distribution and a logit link function when analysing survival. Because the maximum likelihood model only converged when drought and maturity groups were included in the model (Model 1), we used generalized linear mixed models and pseudo-likelihood statistics to assess the effects of genotype in relation to drought (Model 2; see Methods) with significance tests calculated according to log-likelihood ratio tests.

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