文档介绍：Chapter2PlantGermplasm种质资源BYNiuYingze(牛应泽)§,,sorghum,rapeseedO2geneinmaize“00”(紧迫)toprotectthePlantGermplasmResourcesfromextinction(灭绝).Reasons:.Developmentofindustries,(atmosphereandaquasphere).Man’sdestroying§2TheoriesonCentersofCropOrigination 作物起源中心学说ThetheoryofVovilov(1920)1)-24Origincenter:Bigdiversity;Dominantcharacters;WildtypesPrimaryorigincenter;secondorigincenter2)The8centersofcroporigination()-non-centertheory(Harlan,1971)Threecentersoforigin:NearEast;;-centers:Africa;SEAsia;.