Comparison of fitness and selectivity behavior of Semiaphis heraclei on different host plants
Semiaphis heraclei has a wide host range,which may lead to its host-adaptation differentiation.In this study,two S.heraclei populations were collected from Lonicera japonica and Glehnia littoralis,respectively.The fitness and host selectivity of the two populations to Apium graveolens,L.japonica,Angelica dahurica,G.littoralis and Bupleurum chinense were assessed.The results showed that the fitness of the two host populations varied significantly on the five plants.For example,when using G.littoralis as the host,the aphid nymphs from L.japonica showed a significantly longer developmental duration than aphid nymphs population from G.littoralis.The aphid population from L.japonica exhibited higher fecundity on L.japonica and lower fecundity on A.graveolens,A.dahurica compared to aphid population from G.littoralis.In addition,there were differences in selectivity behaviors of the two populations to the different host plants.For example,after 48 h,L.japonica-aphid-population had a lower selection rate to L.japonica,while G.littoralis-aphid-population had a lower selection rate to B.chinense.The selection rate of L.japonica-aphid-population to A.graveolens was the highest compared to other plants except G.littoralis,whereas the selection rate of G.littoralis-aphid-population to A.graveolens was only higher than that to B.chinense.L.japonica-aphid-population exhibited higher selection rate to A.graveolens over time,while the selection rate of G.littoralis-aphid-population to A.graveolens decreased with time.Our results indicate that there are differences in the fitness and selection behavior of different host populations of S.heraclei on host plants,and this aphid showed a certain host adaptability differentiation.
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