南方根结线虫侵染对不同砧木嫁接冬瓜生长的影响

为了明确南方根结线虫对不同南瓜砧木嫁接冬瓜苗生长发育的影响,以期为冬瓜生产筛选抗根结线虫砧木品种,促进产业可持续发展。本文采用人工接种南方根结线虫,研究比较了‘海砧1号’、‘海砧2号’和‘银龙黄籽’3种南瓜砧木的冬瓜嫁接苗及冬瓜自根苗的抗性水平及植株生物量的差异。结果表明：不同南瓜砧木冬瓜嫁接苗和自根苗的病情指数、根结指数、卵粒指数和繁殖指数均随着生育期延长而不断升高,抗性水平发生不同程度变化;以‘海砧2号’为砧木的嫁接苗在全生育期均表现为抗病,以‘海砧1号’和‘银龙黄籽’为砧木的嫁接苗表现为高感,‘清远黑皮冬瓜’自根苗表现为感病。在茎叶鲜重和单果鲜重方面,生长中后期以‘海砧2号’为砧木的嫁接苗显著高于以‘海砧1号’和‘银龙黄籽’为砧木的嫁接苗以及‘清远黑皮冬瓜’自根苗,但与未接种的‘清远黑皮冬瓜’自根苗无显著差异。研究结果证实,南方根结线虫明显抑制了感病砧木冬瓜嫁接苗的生长和产量,对抗病砧木嫁接苗无明显影响。

Effects of Meloidogyne incognita on Growth of Grafting Wax Gourd for Different Rootstocks

In order to clarify the influence of Meloidogyne incognita on the growth and development of grafted seedlings of wax gourd with different pumpkin rootstocks,the study was aimed to screen rootstock varieties resistant to M.incognita for the wax gourd and promote the industry sustainable development.The resistance level and plant biomass of the grafted wax gourd seedlings with different rootstocks during the whole growth period were studied by artificial inoculation of M.incognita.The results showed that the disease index,root-knot index,egg index,reproduction coefficient of the test materials increased with the progress of the growth period and the resistance level of the test materials changed.The grafted seedling of‘Haizhen No.2’had resistance to M.incognita during the whole growth period.The grafted seedlings of‘Yinlonghuangzi’and‘Haizhen No.1’showed high susceptibility.the self-root seedlings of‘Qingyuan black skin wax gourd’showed susceptibility to M.incognita.The fresh weights of the shoot and fruit of the grafted seedling of‘Haizhen No.2’showed no significant differences to the uninoculated self-root seedling of‘Qingyuan black skin wax gourd’in the middle-late growth period,but significantly higher than that of the grafted seedlings of‘Yinlonghuangzi’and‘Haizhen No.1’and self-root seedlings of‘Qingyuan black skin wax gourd’.It was confirmed that M.incognita could significantly inhibit the growth and yield of the grafted seedlings with susceptible rootstocks,but had no significant effect on those of the grafted seedlings with disease-resistant rootstocks.