摘要
以一批在条锈病流行条件下具有保产能力的“耐病”品种和典型感病的小麦品种为试材,研究了病株水分关系的变化。结果发现,这些“耐病”品种具有水分胁迫所诱导的抗病性。在正常水分条件下呈亲和反应,但在水分胁迫时逆转为不亲和反应。病叶蒸腾作用在初期有轻微升高,其后病叶蒸腾速率、叶片扩散阻力、相对含水量和水势渐趋健叶水平,并具有较健叶更低的渗透势和更高的压力势,保持了有效的水分调控能力。而感病品种在水分胁迫时,病叶蒸腾速率急剧升高,叶片扩散阻力、相对含水量、水势、压力势和渗透势大幅降低,完全丧失了控制水分散失和维持水分平衡的能力。
Reactions to water stress were studied on the stripe rust-tolerant wheat cultivars and the typical susceptible cultivars after infection of the pathogen Puccinia striiformis West. The results showed that these stripe rust-tolerant cultivars exhibited tolerance to water stress as well. These cultivars expressed the compatible reaction to pathogen infection under normal water supply conditions, whereas turned to the incompatible reaction to pathogen infection under water stress conditions. Water transpiration in these diseased leaves slightly increased at early stage of infection. However, after then the water transpiration rate, water diffusive resistance, relative water content, and water potential of these diseased leaves gradually turned to the same levels as those of healthy leaves. Additionally, lower osmotic potential and higher turgor potential than those of healthy leaves were also observed in these cultivars, indicating the characteristics of water balance in leaves. In contrast, on the stripe rust susceptible cultivars , the water transpiration rate increased sharply, leaf diffusive resistance, relative water content, water potential, osmotic potential and turgor potential decreased remarkably in diseased leaves under water stress conditions after infection of the pathogen, indication the characteristics of losing of water balance.
出处
《植物病理学报》
CAS
CSCD
北大核心
2004年第2期122-126,共5页
Acta Phytopathologica Sinica
基金
高等学校博士学科点专项基金(970702)
国家"九五"科技攻关项目(96-005-01-02)
关键词
小麦
水分胁迫
基因诱导
抗条锈性
wheat
stripe rust
water stress
water relation
induced resistance
