桔全爪螨对柑桔生理的影响

利用盆栽桔株,研究了桔全爪螨对桔叶生理的影响.结果表明,桔全爪螨种群的累积为害,使桔叶叶绿素含量降低、含水量减少、光合强度降低、营养状况恶化、叶片变小、单位叶面积干重降低,还原糖、总氮、钾含量和氨基酸总量均随螨日指数增加而下降,总糖含量随为害加重而上升.但桔叶呼吸强度和磷含量与为害程度无明显的关系.受害桔叶的脯氨酸等8种氨基酸含量不同程度地减少,而苯丙氨酸等8种氨基酸含量则有所上升.

EFFECTS OF CITRUS RED MITE INFESTATION ON THE PHYSIOLOGICAL ACTIVITIES OF CITRUS

The physiological responses of citrus to Panonychus citri MeG were studied on pottedcitrus plants growing in netted houses.The results showed that the accumulative infestationby citrus red mite population resulted in a decrease in chlorophyll and water content and inphotosynthesis intensity.The vegetative state of injured leaves was aggravated.The con-tents of reducing sugar,total N,amino acids,and K were redued but total sugar contentwas increased as the mite-day index increased.Damaged citrus leaves became smaller insize and their dry weight per unit area decreased.However,the infestation by cityus redmite had little influence on the respiration intensity and P content in citrus leaves.The con-tents of 8 amino acids,proline in particular,decreased substantially while the contents ofphenylalanine and some others were increased.