Screening of tomato hybrids for resistance to Fusarium wilt

Abstract Few commercial genotypes of tomato are resistant to Fusarium wilt (Fusarium oxysporum f. sp. lycopersici [FOL]), especially to race 3. We developed five intraspecific hybrids of Solanum lycopersicum (FOX1 to FOX5) and assessed them for agronomic traits and resistance to FOL races 1, 2, 3, and a mixture of these races. FOX1 and FOX4 were resistant to all races and the race mixture but did not have the desired agronomic traits. Next, FOX1 and FOX4 were assessed as rootstocks of the cherry tomato Sweet Heaven. The grafting of Sweet Heaven on FOX4 did not reduce growth, gas exchange, yield, or fruit quality. When FOX1 was used as a rootstock, the fruits exhibited a reduction in firmness, fruit pulp pH, and total soluble solids by 14.3%, 1.2%, and 6.75%, respectively. Thus, the hybrid FOX4 can be used as a rootstock for Sweet Heaven to manage Fusarium wilt.

摘要 目前商业化栽培的番茄基因型中，鲜有能抗番茄尖孢镰刀菌枯萎病（Fusarium oxysporum f. sp. lycopersici，简称FOL）的品种，尤其是对3号生理小种的抗性尤为不足。本研究培育了5个普通番茄（Solanum lycopersicum）种内杂交品系（FOX1至FOX5），并针对其农艺性状以及抗FOL 1、2、3号生理小种和混合小种的能力开展了抗性评价与性状考察。结果显示，FOX1与FOX4可抗所有供试小种及混合小种，但二者均未达到理想的农艺性状指标。随后，本研究以樱桃番茄‘Sweet Heaven’为接穗，评价FOX1与FOX4作为嫁接砧木的应用潜力。将‘Sweet Heaven’嫁接于FOX4砧木后，并未对植株生长、气体交换参数、果实产量及品质产生不利影响。而以FOX1作为砧木时，接穗果实的硬度、果肉pH值及总可溶性固形物含量分别降低14.3%、1.2%与6.75%。综上，杂交品系FOX4可作为‘Sweet Heaven’的嫁接砧木，用于番茄枯萎病的防控。