摘要
采用2个大豆品种Hutcheson和Archer,通过温室一系列试验研究了水淹和终极腐霉（Pythium ultimum）对大豆的影响。一个试验是,大豆种子播种到经过灭菌土壤中,一部分土壤里接种沙子-玉米面的终极腐霉接菌体使之侵染,另一部分未接种病原菌;水淹处理是分别在出苗期水淹2 d、4叶节期（V4）水淹5 d,在每个试验中都有一个没有水淹的对照处理。
The effect of flooding and Pythium ultimum on soybean, Glycine max, was determined in a series of greenhouse ex- periments using the cuhivars Hutcheson and Archer. Seeds were planted into pasteurized soil either not infested or in- fested with sand-cornmeal inoculum of P. ultimum and either flooded at emergence for 2 days or at the four leaf node stage （V4） for 5 days. A nonflooded control was included in each experiment. Seeds placed directly into infested soil re- suited in little or no stand for Hutcheson regardless of flood treatment, whereas stand was reduced for Archer only in the flooded infested soil treatment. Additional experiments were conducted by placing seed onto a 2- to 5-mm layer of pathogen-free soil on top of the infested soil. Flooding at emergence reduced plant height, growth stage, and top dry weight for Hutcheson and root fresh weight for both cuhivars. Greater reductions for Hutcheson in root weight, and top dry weight in P. ultimum-infested soil in the soil layer experiments, also indicated that Hutcheson was more susceptible than Archer. Flooding alone decreased root weights, and infestation with P. ultimum reduced weights further resulting in an additive effect. This also was the case for plant height, growth stage, and top dry weight for Hutcheson for flooding at emergence. Root discoloration was greatly increased for both cultivars in infested soil flooded at emergence. Similar re- sults were found when plants were flooded at V4; however, the effect was not as great as with flooding at emergence. These studies indicate that Pythium damping-off and root rot may account for a portion of the negative response of soy- bean to flooding. The results also indicate that Archer has some resistance to P. ultimum.
出处
《大豆科技》
2015年第1期37-37,共1页
Soybean Science & Technology
