杏鬃球蚧危害对天山野杏营养物质的影响OA

[Objective]Armeniaca vulgaris is the ancestor of cultivated apricots globally and one of the dom-inant tree species in the Tianshan wild fruit forests,where it plays a critical role in germplasm conservation and ecosystem services.In recent years,the invasion of Sphaerolecanium prunastri led to a large scale decline of wild apricot population,but there is still a lack of research on the physiological nutrients behind its population decline.[Method]Physiological damage caused by S.prunastri was assessed by measur-ing the phloem nutrients of different damage time(early overwintering stage of 2nd instar nymphs,feeding period of 2nd instar nymphs and maximum feeding period of female insects),damage degree(undam-aged,mild,moderate and severe)and different branch ages new shoots,2nd and 3rd instar branches)of wild apricot,and combining with the nutrient difference analysis of various vegetative organs(new shoots,branches,trunks and fine roots).[Results]In the primary damaged branch tissues,phloem total sugar(TS)increased by 10.6%～33.8%,and soluble protein(SP)increased by 24.4%～61.1%,whereas soluble sug-ar(SS)and amino acid(AA)decreased by 30.9%,and 13.4%～66.5%,respectively.The main nutrients in the phloem of A.vulgaris were generally reduced at different branch ages.The soluble sugar of the 2nd and 3rd branches decreased by 26.7%～30.8%,the soluble protein of the new shoots and 2nd branches decreased by 33.1%～37.1%,and the amino acid decreased by 22.0%～66.5%at each branch age.Nutri-ent responses varied among vegetative organs and did not follow a uniform pattern;however,certain or-gans exhibited specific long-term response to infestation.Notably,total carbon of fine roots and soluble sugar of new shoots increased by 10.7%and 63.1%,respectively,while total nitrogen of fine roots de-creased by 17.9%.[Conclusion]Infested by S.prunastri disrupts carbon and nitrogen metabolism in wild apricot,primarily through impaired transport of photosynthetic assimilates and constraints on nitrogen ab-sorption and assimilation.These findings reveal the disruption of nutrient transport caused by this pest in wild apricot and provide a theoretical basis for the conservation of wild apricot populations.