蚕病综合防治技术

栽桑养蚕的目的就是获得优质高产蚕茧，使蚕农增加经济收入。然而，在养蚕过程中，蚕儿往往遭受病原微生物的侵害，由于预防、防治措施不到位，造成蚕茧的产量和茧丝的质量下降，甚至因蚕病严重暴发而一无所获，给蚕农造成巨大经济损失。因此，在生产中有效解决这个问题必须采取“预防为主、综合防治”的方针，才能达到防病夺高产的目的。     

Variation and Characterization Analysis of Partial Fragment of Fibroin Gene From Silkworm, Antheraea pernyi

A 1.4Kb DNA fragment containing 3‘ flanking sequence of fibroin gene of silkworm, Antheraea perny/, was obtained from the silk gland‘s mRNA of 5th larva. Analysis of this sequence with another A. pemyi fibroin protein (accession No. 1383241) revealed that it consists of a completely open reading frame (ORF), which includes 14 polyalanine-containing units (motifs) and 100bp 3‘-UTR. The sequence of the predicted amino acid reveals the highest level of overall iden-tity (90%) with 1383241. It was found that it loses a repeat region at the upstream of TAA codon and some mutations. A putative polyadenylation signal AATAAA tail was found in position 1300, which follows the termination codon.