南方根结线虫对甘薯抗病和感病品种的影响
Influence of Meloidogyne incognita on Resistant and Susceptible Sweet Potato Cultivars.
作者信息
Lawrence G W, Clark C A, Wright V L
出版信息
J Nematol. 1986 Jan;18(1):59-65.
Effects of several population densities ofMeloidogyne incognita on the sweet potato cultivars Centennial (susceptible) and Jasper (moderately resistant) were studied. Field plots were infested with initial levels (Pi) of 0, 10, 100, 1,000, 5,000, and 10,000 eggs and juveniles/500 cm(3) soil in 1980 and 0, 100, 1,000, 2,000, 3,000, 4,000, and 5,000 in 1981. M. incognita population development trends were similar on both cultivars; however, at high Pi, more eggs and juveniles were recovered from Centennial than from Jasper. The highest Pi did not result in the highest mid-season (Pm) counts. Pi was negatively correlated with the number of marketable roots and root weight but positively correlated with total cracked roots, percentage of cracked roots, and cracking severity. Jasper tolerated higher Pi with greater yields and better root quality than Centennial. Cracking of fleshy roots occurred with both cultivars at low Pi.
研究了南方根结线虫不同群体密度对甘薯品种百年纪念号（感病）和贾斯珀（中度抗病）的影响。1980年，田间小区分别接种初始虫口密度（Pi）为0、10、100、1000、5000和10000个卵及幼虫/500立方厘米土壤，1981年的接种密度为0、100、1000、2000、3000、4000和5000。两个品种上南方根结线虫的群体发展趋势相似；然而，在高Pi条件下，百年纪念号上回收的卵和幼虫比贾斯珀更多。最高的Pi并未导致季中（Pm）虫口数量最高。Pi与可销售根的数量和根重呈负相关，但与总裂根数量、裂根百分比和开裂严重程度呈正相关。与百年纪念号相比，贾斯珀能耐受更高的Pi，产量更高且根质量更好。两个品种在低Pi条件下肉质根都会出现开裂。
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