The Morphological and Physiological Diversities in Roots of Different Potassium Efficient Soybean Lines

Two soybean lines were studied in this experiment.GD8521 is sensitive to low potassium stress and JN15 is tolerant at low potassium.The two soybean lines were planted in low and high potassium levels of nourishing liquid for 21d.Then,the differences of root morphology(such as root volume,the length of main root,root tips,etc.) and root physiology(such as surface areas of absorption,oxidizing ability,etc.) was compared.The result showed that: under the potassium stress,the root volume of GD8521 reduced on 30%,main root reduced on 25%,surface areas of absorption did not change,and the oxidizing ability increased 30%,the potassium content reduced to 43%.JN15 root volume and main root subtracted slightly,the surface areas of absorption increased 30%,and the oxidizing ability increased 65%,the potassium content reduced to 66%.