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首页> 外文期刊>Plant Pathology >Fusarium crown rot under continuous cropping of susceptible and partially resistant wheat in microcosms at elevated CO2
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Fusarium crown rot under continuous cropping of susceptible and partially resistant wheat in microcosms at elevated CO2

机译：在CO2浓度升高的情况下，连作易感和部分抗病小麦连续种植的镰刀菌冠腐病

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This study examines the CO2-mediated influence of plant resistance on crown rot dynamics under continuous cropping of partially resistant wheat line 249 and the susceptible cultivar Tamaroi. Disease incidence, severity, deoxynivalenol and Fusarium biomass were assessed after each cycle in microcosms established at ambient and 700 mg kg-1 CO2 using soil and stubble of these wheat lines from a field experiment with free to air CO2 enrichment. Monoconidial isolates from wheat stubble were collected initially, and after five cropping cycles, to compare the frequency and aggressiveness of Fusarium species in the two populations. Aggressiveness was measured using a high-throughput seedling bioassay. At elevated CO2, the higher initial incidence in Tamaroi increased with cropping cycles, but incidence in 249 remained unchanged. Incidence at ambient CO2 did not change for either line. Elevated CO2 induced partial resistance in Tamaroi, but not in 249. Increased Fusarium biomass in wheat tissue at elevated CO2 matched raised deoxynivalenol of the stem base in both lines. After five cycles of continuous wheat cropping, aggressiveness increased in pathogenic F. culmorum and F. pseudograminearum by 110%, but decreased in weakly pathogenic F. equiseti and F. oxysporum by 50%. CO2 and host resistance interactively influenced species frequency, and the highly aggressive F. pseudograminearum became dominant on Tamaroi irrespective of CO2 concentration, while its frequency declined on 249. This study shows that induced resistance at elevated CO2 will not reduce crown rot severity, or impede the selection and enrichment of Fusarium populations with increased aggressiveness.
机译：这项研究研究了在部分抗性小麦249系和易感品种Tamaroi连续种植下，CO2介导的植物抗性对冠腐病动态的影响。在每个周期后，使用土壤和秸秆从自由空气中富集二氧化碳的田间试验的土壤和茬茬，在环境和700 mg kg-1 CO2建立的微观环境中，评估了每个周期后的疾病发生率，严重性，脱氧雪腐烯醇和镰刀菌生物量。最初收集了麦茬的单孢子分离株，在五个种植周期后，比较了这两个种群中镰刀菌物种的发生频率和侵袭性。使用高通量幼苗生物测定法测量侵略性。在二氧化碳浓度升高的情况下，随着种植周期的增加，塔马罗鱼的较高初始发病率增加，但249个中的发病率保持不变。两条管线的环境CO2发生率均未改变。升高的CO2诱导了Tamaroi的部分抗性，但没有引起249。在升高的CO2下，小麦组织中镰刀菌生物量的增加与两条系中茎基的脱氧雪茄烯醇的升高相匹配。在连续小麦种植五个周期后，致病性镰刀菌和假镰刀菌的侵略性增加了110％，而弱致病性马鞭草和尖孢镰刀菌的侵略性却降低了50％。 CO 2和寄主抗性相互作用影响物种频率，而高侵略性假单胞菌在Tamaroi中占主导地位，而与CO 2浓度无关，其频率在249时下降。这项研究表明，在CO 2升高时诱导的抗性不会降低冠腐严重性或阻止侵略性增强的镰刀菌种群的选择和富集。

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