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首页> 外文期刊>HortScience >Resistance to phytophthora fruit rot of watermelon caused by Phytophthora capsici in U.S. plant introductions.
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Resistance to phytophthora fruit rot of watermelon caused by Phytophthora capsici in U.S. plant introductions.

机译：美国植物引种中由辣椒疫霉引起的对西瓜疫霉菌果实腐烂的抗性。

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摘要

Phytophthora fruit rot, caused by Phytophthora capsici, is prevalent in most watermelon-producing regions of southeastern United States and is known to cause pre- and post-harvest yield losses. A non-wound inoculation technique was developed to evaluate detached mature fruit belonging to U.S. watermelon PIs for resistance to fruit rot caused by P. capsici. Mature fruit were harvested and placed on wire shelves in a walk-in humid chamber (>95% RH, temp. 26 +or- 2 degrees C) and inoculated with a 7-mm agar plug from an actively growing colony of P. capsici. 24 PIs that exhibited resistance in a preliminary evaluation of 205 PIs belonging to the watermelon core collection in 2009 were grown in the field and greenhouse in 2010 and 2011 and evaluated in the walk-in humid chamber. Fruit rot development was rapid on fruit of susceptible controls, Black Diamond, Sugar Baby and PI 536464. Several accessions including PI 560020, PI 306782, PI 186489 and PI 595203 (all Citrullus lanatus var. lanatus) were highly resistant to fruit rot. 1 C. colocynthis (PI 388770) and a C. lanatus var. citroides PI (PI 189225) also showed fruit rot resistance. Fruit from PIs that were resistant also had significantly lower amounts of P. capsici DNA/gram of fruit tissue compared with the susceptible commercial cultivars Sugar Baby and Black Diamond. It is suggested that the sources of resistance to Phytophthora fruit rot identified may prove useful in watermelon breeding programs aimed at enhancing disease resistance.
机译：由辣椒疫霉（Phytophthora capsici）引起的疫霉属腐烂在美国东南部的大多数西瓜产区普遍存在，已知会导致收获前和收获后产量下降。开发了一种非伤口接种技术，以评估属于美国西瓜PI的已分离成熟果实对辣椒辣椒引起的果实腐烂的抵抗力。收获成熟果实并将其放置在步入式潮湿箱（> 95％RH，温度26 +或2摄氏度）中的金属丝架上，并接种来自活跃生长的辣椒疫霉菌菌落的7毫米琼脂塞。在2010年和2011年的田间和温室中种植了24个在2009年对205个属于西瓜核心种质的PI进行初步评估时显示出抗性的PI，并在步入式湿室中进行了评估。易感对照（黑钻石，Sugar Baby和PI 536464）的果实腐烂发展迅速。包括PI 560020，PI 306782，PI 186489和PI 595203（均为Citrullus lanatus var。lanatus）的几种保藏品对果实腐烂具有高度抗性。 1 C. colocynthis（PI 388770）和C. lanatus var。柠檬酸PI（PI 189225）也显示出抗水果腐烂的能力。与易感的商品品种糖宝贝和黑钻石相比，具有抗药性的果蝇的果实中的辣椒辣椒衣壳DNA /克水果组织的量也明显较低。有证据表明，鉴定出的对疫霉菌腐烂的抗性来源可能在旨在提高抗病性的西瓜育种计划中有用。

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