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“榆杂２９”在苗期具下列生理优势：（１）播种萌发后胚乳中（α＋β）淀粉酶活性最高，胚芽、胚根生长最迅速，形态建成最快．（２）硝酸还原酶活性较高，耐肥性好．（３）游离氨基酸和酰胺含量最低，蛋白质合成最快．（４）还原糖含量较高，碳代谢旺盛．（５）根中（琥珀酸）脱氢酶活性较高，根系活力高；（６）过氧化氢酶活性居中等水平，意味着：①光呼吸较低，光合产物损耗较少，利于干物质积累，且ＣＯ２补偿点低，利于加强光合作用；②消除Ｈ２Ｏ２毒性的能力较强，利于光合作用进行．（７）抗逆性最强．①自由水含量最低，束缚水含量最高，“束缚水／自由水”最大；②离体叶片在空气中的失水速率最小，保水力最强；③阴雨后游离脯氨酸含量较高．
The elm 29 had the following physiological advantages at the seedling stage: (1) The activity of (α + β) amylase was the highest in the endosperm after sowing, and the germ and radicle grew most rapidly and the morphology was fastest. (2) high nitrate reductase activity, good resistance to fertilizer. (3) the lowest free amino acids and amides, the fastest protein synthesis. (4) high content of reducing sugar, carbon metabolism. (5) root (succinic acid) dehydrogenase activity, root activity is high; (6) catalase activity in the middle level, which means: ① low light breathing, photosynthetic loss less conducive to dry matter Accumulation, and CO2 compensation point is low, help to enhance photosynthesis; ② strong ability to eliminate H2O2 toxicity, conducive to photosynthesis. (7) the strongest resistance. ① the lowest free water content, the highest irreducible water content, and the largest “irreducible water / free water”; ② the lowest water loss rate of detached leaves in air and the highest water holding capacity; ③ the higher free proline content after rainy days.