摘要:
1984～1986年共测定福建省26个县(市)甘薯瘟病(Pseudomonas solanacearum)113个菌株,据其致病力强弱,划分为五个菌系群(Ⅰ～Ⅴ)。从Ⅰ群到Ⅴ群致病力逐渐增强。分布最广的为Ⅱ群菌,占测定菌的44.3%;致病力最强的Ⅴ群菌,占测定菌的9.7%。菌株之间致病力表现为数量级差异,尚未发现有明显的特异性反应。甘薯瘟病菌分布特点是老病区又连续种植抗瘟品种的强,新病区种不抗瘟品种的弱。用Ⅱ～Ⅳ群菌的3个代表性菌株测定省甘薯区试、预试及南方区试的品种,有二个品种表现强的抗病性。用Ⅰ～Ⅴ群菌的113个菌株测定结果表明,我省当家种新种花为高感品种,330、闽抗329为抗病品种。闽抗329表现抗瘟、高产、早熟及品质较优。1984～1986年已推广80多万亩,占薯瘟区面积90%以上。330的抗瘟性、适应性、萌芽性及贮存性均比闽抗329好,1987年已种植5万多亩。
Abstract:
During 1984-86, 113 strains of sweet potato bacterial wilt (Pseudomo-nas solanacearum) , which were collected in 26 counties of Fujian, were tested for their pathogenicity. According to the intensity of. virulence, they were divided into five groups (I-V). With the order of I-V, the intensity of virulence gradually increased. The second group (II), which made up 44.3% of the total strains tested,was most widely distributed. The fifth group (V) was the strongest strains in virulence, made up 9.7% of the total strains tested.All the strains tested showed quantitative difference in the intensity of virulence. No distinct specificity was found. The distribution of the strains was that the stronger strains tended to be in old disease areas where the resistant variety was cultivated, and the weaker strains in new disease areas where the susceptible variety was cultivated.The varieties of sweet potato in Fujian and elsewhere in south China for district and probationary comparisons were tested for resistance by using 3 major strains of Groups II-IV. Two highly resistant varieties were obtained. By using the 113 strains of Groups I-V to test the resistance, the results were obtained that Xin Zhong Hua the main variety in Fujian was a highly susceptible variety. 330 and Min Kang 329 were resistant varieties. Min Kang 329 owned the features of strong resistance to disease,high yield,early maturity and good quality. From 1984 to 1986, Ming Kang 329 covered more than 800 thousand mu, over 90% of the area for sweet potato cultivation. 330 was better than Min Kang 329 in the resistance to disease,adaptability,germination and storage. The cultivated area for 330 increased to more than 50 thousand mu this year.
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