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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >VX211, A Vigorous New Walnut Hybrid Clone with Nematode Tolerance and a Useful Resistance Mechanism
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VX211, A Vigorous New Walnut Hybrid Clone with Nematode Tolerance and a Useful Resistance Mechanism

机译：VX211，具有线虫耐受性和有用抗性机制的功能强大的新型核桃杂交种

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摘要

VX211 is a highly vigorous Paradox hybrid clone that outgrew other walnut seedlings in the presence of nematodes. A four-year macroplot trial involving Paradox VX211 and a standard Paradox selection, AX1, demonstrated that the damage threshold level of Pratylenchus vulnus on commercially available walnut rootstocks is < 1 nematode/250 cm3 of soil. Using 1 as the initial population level (Pi) within an inoculation zone of 80 L of soil, the P. vulnus population level increased 2,500-fold in the first year of growth. Three years after inoculation soil population levels of P. vulnus on VX211 were significantly reduced compared to that of the moderately vigorous AX1. Growth of VX211 was 35% greater than that of AX1 regardless of the Pi. Examination of stained roots revealed that feeding and reproduction by P. vulnus on VX211 was primarily ectoparasitic. This is the first report on a new walnut rootstock that can be readily cloned, has high vigor, exhibits tolerance to low population levels of P. vulnus,reduces nematode feeding and reproduction within the root terminus, and is currently available to California growers.
机译：VX211是一种极富活力的Paradox杂种克隆，在存在线虫的情况下，其繁殖力超过其他核桃苗。一项涉及Paradox VX211和标准Paradox选择品AX1的为期四年的大面积试验表明，市售核桃砧木上的桔梗的破坏阈值水平小于1线虫/ 250 cm3土壤。在80 L的土壤接种区中，使用1作为初始种群水平（Pi），在生长的第一年中，野豌豆种群水平增加了2500倍。接种三年后，与中等强度的AX1相比，VX211上的野豌豆土壤种群水平显着降低。无论Pi是什么，VX211的增长都比AX1增长35％。检查染色的根表明，VX211上的外阴假单胞菌的摄食和繁殖主要是寄生的。这是关于新的核桃砧木的第一份报告，该砧木易于克隆，具有高活力，对低等水平的野豌豆表现出耐受性，减少了根末端内线虫的摄食和繁殖，目前可供加利福尼亚种植者使用。

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