植物的诱导抗虫性

植物对植食性昆虫的抗性可包括两个方面，即植物的组成抗性（constitutiveresistance）和诱导抗性（inducedresistance）。组成抗性是指植物在遭受植食性昆虫进攻前就已存在的抗虫特性；而诱导抗性是指植物在遭受植食性昆虫进攻后所表现出来的一种抗虫特性1，2]。根据作用世代的不同，诱导抗性又分为迅速的诱导抗性（rapidlyinducedre－sistance，RIR）和滞后的诱导抗性（delayedinducedresistance，DIR）。前者是指对当前世代的植食性昆虫的影响，而后者是指对后续的1～几个世代的植食性昆虫的影响2]。研究植物的诱导抗虫性，不仅能在…

INDUCED PLANT RESISTANCE TO PHYTOPHAGOUS INSECTS

Changes in ontogeny, morphological character, physiological state, nutritional quality and secondary chemicals of plant could be induced by prior damage. The induced changes might have general negative effects on the behavior, development, survival and fecundity of successively occurred phytophagous insects because a change will redUce plant nutritional value, stimulate plant to produce poisonous chemicals or release synomone attractive to their natural enemies. Induced plant resistance could be an on-off response, be turned on in a relative short time when plants are damaged to above a certain threshold and causes plant show an individual and population effect on phytophagous insects due to its transmission within a plant and between plants. Induced plant resistance is variable among plant species, varieties, individuals and developmental stages and could be influenced by plant density, damage position and level, soil fertility and water content. Two aspects in thisarea, the mechanism of plant causing induced resistance and its relative importance on controlling phytophagous insects, should be studied further for convincing conclusions in the future.