短日照处理大豆营养期各阶段的效应

选用光钝感品种科丰６号和光敏感品种耐阴黑豆，研究了短日照处理Ｖ１－Ｖ１２不同发育阶段所产生的效应。试验结果表明，Ｖ１开始处理对花期影响最大，随着处理时间的推移，对促进开花的作用逐渐变小，对促熟作用逐渐增大而后略有减小。Ｖ８－Ｖ１０开始处理对花后促熟影响较大     

Amino acid substitutions conferring insecticide insensitivity in Ace-paralogous acetylcholinesterase

Since insecticide insensitivity of acetylcholinesterase (AChE) was, found about 40 years ago, a cause of the resistance to organophosphates in the spider mite, more than 30 insect and Acarus species have added to the instance. Based on the 3-dimensional analysis of Torpedo AChE structure and sequencing of Drosophila AChE gene (Ace), amino acid substitutions conferring the insensitivity have been found in Drosophila melanogaster. However, no amino acid substitution responsible for the AChE insensitivity had been found in insects and Acari except Brachicera flies until the second type of AChE paralogous to Ace was discovered in Schizaphis graminus and Anopheles gambiae. Sequencing of Ace-paralogous AChE cDNAs has been followed in insect species of various orders. Now, various amino acid substitutions are found and correspond to different biochemical properties of insensitive AChEs in relation to the function of substituted amino acids in the 3-dimensional structure. Existence of two AChE genes raises questions about differentiation of the two genes, site of gene expression, and function of each enzyme.