[目的]探索吲哚丁酸・ S－诱抗素对苗期小麦生长的影响。[方法]通过苗期喷施吲哚丁酸・ S－诱抗素（1％可湿性粉剂），研究吲哚丁酸・ S－诱抗素对小麦分蘖数、根长、根数和鲜重的影响。[结果]吲哚丁酸・ S－诱抗素（1％可湿性粉剂）5000倍液、4000倍液、3000倍液、2000倍液可以使小麦株高降低3．31％、3．39％、10．74％和15．29％，分蘖数增加2．80％、6．54％、7．48％和8．41％，根长增加4．41％、11．51％、17．94％和19．28％，根数增加9．21％、17．23％、24．91％和26．08％，地下部分鲜重增加6．38％、9．00％、11．00％和11．27％，地上部分鲜重增加3．45％、6．16％、7．83％和7．94％。[结论]苗期喷施吲哚丁酸・ S－诱抗素，可以矮化麦苗、促进新根生长、促进分蘖、提高鲜重。%Objective] To study effect of the indolebutyric acid ABA on growth of wheat seedling stage.[Method]Effect of spraying the In-dolebutyric acid S-ABA (1% wettable powder) at the dilution of 5 000, 4 000, 3 000 and the 2 000 on the tillering number,the root length and number, the fresh weight were studied.[Result]The result showed that the dilution of 5 000,4 000,3 000 and 2 000 was that Plant height decreased by 3.31%,3.39%,10.74% and 15.29%, the tillering increased by 2.80%,6.54%,7.48% and 8.41%, the root length in-creased by 4.41%,11.51%,17.94 and 19.28%, the root increased by 9.21%, 17.23%,24.91% and 26.08%, the fresh weight of under-ground increased by 6.38%,9.00%,11.00%and 11.27%, the fresh weight on the ground creased by 3.45%,6.16%,7.38%and 7.94%. [Conclusion]Spraying indolebutyric acid ABA could deducethe wheat height, promotethe new root growth, increased the tillering and the fresh weight.
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