Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research, and Development Center, Wooster, OH 44691.
H. Rouse Caffey Rice Research Station, LSU AgCenter, Louisiana State University, 1373 Caffey Road, Rayne, LA 70578.
Plant Dis. 2022 Dec;106(12):3061-3075. doi: 10.1094/PDIS-01-22-0148-RE. Epub 2022 Nov 21.
The impact of Gibberella ear rot (GER; caused by ) on deoxynivalenol (DON) contamination of grain and yield components in maize were investigated using data from 30 environments in Ohio (3 years by 10 locations). Fifteen hybrids, later classified as susceptible (SU), moderately susceptible (MS), or moderately resistant (MR), based on the magnitude of differences in mean arcsine square-root-transformed GER severity (arcSEV) and log-transformed DON (logDON) relative to a reference SU check, were planted in each environment, and 10 ears per hybrid were inoculated with a spore suspension of . Relationships between GER severity and DON were well described by a Kono-Sugino-type nonlinear equation. Estimated parameters representing height () and steepness (β) of the curves were significantly higher for SU than MS and MR hybrids but was not significantly different between MS and MR. Results from a surrogacy analysis showed that GER was a moderate trial- and individual-level surrogate for DON. Both grain weight per ear and ear diameter decreased with increasing arcSEV but the regression slopes varied among resistance classes. The rates of reduction in both yield components per unit increase in arcSEV were significantly greater for SU than for MS and MR. An estimated 50% reduction in grain weight occurred at 62% GER severity for SU, compared with 77% severity for MS and 83% for MR. These results show that GER severity can be used as a surrogate for early estimation of DON contamination and yield loss to help guide grain handling and marketing decisions.
采用俄亥俄州 30 个环境（3 年 10 个地点）的数据，研究了赤霉病耳腐（GER；由 ）对谷物和玉米产量构成物中脱氧雪腐镰刀菌烯醇（DON）污染的影响。15 个杂交种，后来根据 GER 严重程度（arcSEV）和 DON（logDON）的均值反正弦平方根转换差异的幅度，分为敏感（SU）、中度敏感（MS）或中度抗性（MR），在每种环境中种植 15 个杂交种，每个杂交种种植 10 个耳朵，用 的孢子悬浮液接种。GER 严重程度与 DON 之间的关系由 Kono-Sugino 型非线性方程很好地描述。代表曲线高度（）和陡峭度（β）的估计参数对于 SU 比 MS 和 MR 杂交种显着更高，但 MS 和 MR 之间没有显着差异。替代分析的结果表明，GER 是 DON 的中度试验和个体水平替代物。每个耳朵的谷物重量和耳朵直径都随 arcSEV 的增加而减少，但回归斜率在抗性等级之间有所不同。每个 arcSEV 单位增加时，两种产量构成物的减少率对于 SU 都比 MS 和 MR 显着更大。在 SU 中，当 GER 严重程度达到 62%时，谷物重量会减少 50%，而在 MS 中则达到 77%，在 MR 中则达到 83%。这些结果表明，GER 严重程度可用于早期估计 DON 污染和产量损失，以帮助指导谷物处理和营销决策。
