Kohler Glenn R, St Clair Dina A
Department of Plant Sciences, One Shields Avenue, University of California, Davis, CA 95616, USA.
J Econ Entomol. 2005 Jun;98(3):988-95. doi: 10.1603/0022-0493-98.3.988.
Two tomato inbred backcross line (IBL) populations, derived from crosses between aphid-susceptible Lycopersicon esculentum Mill. 'Peto 95-43' X resistant wild L. pennellii Corr (D'arcy) accession LA716, and Peto 95-43 X resistant wild L. hirsutum f. glabratum Mull accession LA407, were evaluated in replicated field experiments for resistance to potato aphid, Macrosiphum euphorbiae (Thomas), and green peach aphid, Myzus persicae (Sulzer). Aphid infestation scores for each IBL and control (LA716, LA407, Peto 95-43, and susceptible 'Alta') plot were recorded weekly for 5 and 9 wk during the summers of 2000 and 2001, respectively. Aphid infestation scores from leaflets were used to calculate area under the infestation pressure curve (AUIPC), a measure of aphid infestation throughout the growing season, for each IBL and control. Score AUIPC was highly correlated with actual aphid count AUIPC, indicating that scores accurately reflected aphid infestation. Score AUIPC was also highly correlated across both years (2000 and 2001) and locations. Low score AUIPC was significantly correlated with larger plant size and sprawling, indeterminate plant growth habit. Seven IBLs, LA716, and LA407 were significantly more resistant to aphids (lower score AUIPC) than susceptible parent Peto 95-43 in both years. Two IBLs, 1034 and 1051, were not significantly different from resistant LA407 for score AUIPC in both years. The seven aphid-resistant IBLs identified here can be useful as donor parent material for resistance breeding efforts in cultivated tomato.
两个番茄近交回交系（IBL）群体，分别来源于感蚜的栽培番茄Lycopersicon esculentum Mill. 'Peto 95 - 43' 与抗性野生种L. pennellii Corr (D'arcy) 种质LA716的杂交，以及Peto 95 - 43与抗性野生种L. hirsutum f. glabratum Mull种质LA407的杂交。在重复的田间试验中对其进行了马铃薯长管蚜Macrosiphum euphorbiae (Thomas) 和桃蚜Myzus persicae (Sulzer) 的抗性评价。在2000年和年夏季，分别对每个IBL和对照（LA716、LA407、Peto 95 - 43和感蚜品种'Alta'）小区的蚜虫侵染情况进行了每周一次的记录，记录时长分别为5周和9周。利用小叶上的蚜虫侵染评分来计算每个IBL和对照的侵染压力曲线下面积（AUIPC），这是衡量整个生长季蚜虫侵染情况的一个指标。评分AUIPC与实际蚜虫数量AUIPC高度相关，表明评分能准确反映蚜虫侵染情况。评分AUIPC在两年（2000年和2001年）及不同地点间也高度相关。低评分AUIPC与更大的植株大小和蔓生、无限生长习性显著相关。在两年中，七个IBL、LA716和LA407对蚜虫的抗性（较低的评分AUIPC）均显著高于感病亲本Peto 95 - 43。两个IBL，1034和1051，在两年的评分AUIPC上与抗性品种LA407无显著差异。这里鉴定出的七个抗蚜IBL可作为栽培番茄抗性育种的供体亲本材料。
