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利用陈永强“氯仿—异戊醇—核酸酶法”首次对普通小麦、燕麦、水稻、玉米、冰草５种作物以及同种作物的不同品种和不同器官的ＤＮＡ进行提取，结果表明，不同作物的幼穗ＤＮＡ浓度不同，冰草幼穗ＤＮＡ浓度（０．７５μｇ／ｍｌ）是燕麦幼穗的４倍，玉米和水稻的幼穗ＤＮＡ浓度很接近，为０．３６３μｇ／ｍｌ和０．３７８μｇ／ｍｌ。同一种作物不同品种的幼穗ＤＮＡ浓度也不同，爆裂玉米品种幼穗ＤＮＡ浓度（０．５５μｇ／ｍｌ）是掖单１９号的３．１倍，水稻品种２１６的ＤＮＡ浓度高于宁糯４号和５１，通北燕麦的幼穗ＤＮＡ浓度高于其它３种燕麦。同一种作物不同器官的ＤＮＡ浓度也不一致，幼穗的ＤＮＡ浓度高于幼茎。
Using the method of “chloroform-isoamyl-nuclease” by Chen Yongqiang, we first extracted the DNA from different varieties and organs of five kinds of crops such as common wheat, oat, rice, corn and grass and the same crops. The results showed that different crops DNA concentrations of young spikelets were different, and the DNA concentration of young spikelets (0.75μg / ml) was 4 times that of oats, and the young spike DNA concentrations of maize and rice were close to 0.363μg / ml and 0.378μg / ml . The DNA concentration of young spike of different breeds of the same crop was also different. The DNA concentration of young spike (0.55μg / ml) was 3.1 times higher than that of Yedan 19 and the DNA concentration of 216 was higher than Ningnuo 4 And 51, the DNA concentration of young ears in Tongbei oats was higher than that of the other three kinds of oats. The same crop of different organs of the DNA concentration is inconsistent, young ears of DNA concentration is higher than young stems.