Seed Selection for Potential Viability

A simple method is presented for selecting individual seedsfor growth and vigour prior to germination. The selection isbased on the measurement of an electric current originatingduring the initial stage of seed imbibition. After selecting,seeds may be returned to the quiescent state without affectingviability. Results of both laboratory germination and fieldexperiments demonstrate that high germination rates, more extensivegrowth, higher yields, and fewer defective plants are associatedwith small currents. Seeds of low viability and high currentsmay be removed to upgrade the germination and vigour. Resultsare presented from several varieties of Phaseolus vulgaris andfrom three other plant species. Experiments are discussed whichindicate that seeds graded by current levels possess markedlydifferent respiration rates.     

中国的角石蛾科昆虫(毛翅目)

一、引言 角石蛾科Stenopsychidae计分做角石蛾属Stenopsyche、准角石蛾属Parastenopsyche、伪角石蛾属Pseudostenopsyche 和拟角石蛾属Stenopsychodes等4个属,其中除伪角石蛾属分布于南美洲的智利和拟角石蛾属分布于澳洲的西南部以外,其余如角石蛾属和准角石蛾属均分布于亚洲各地。目前在欧洲虽没有角石蛾科的分布记录,但在第三纪的渐新世亦曾有角石蛾属中的种类在那里生存。     

中国毛翅目的新种

作者最近在鉴定毛翅目昆虫的工作中描述了1个新亚属和34个新种,分属于22个属,其中Psilochorema,Wormaldia,Kibuneopsychomyia,Goerinella,Dinarthrodes,Eothremma和 Notidobia 几属在我国是初次记载。 下列各位同志曾给予作者很多帮助,或借用标本,或寄赠标本,谨趁此机会表示衷