The erect panicle mutants of indica rice R1338 and R334 which came from Shuhui 498 muta-genesis by EMS as materials,so as to understand the reason of keeping spike erecting of erect panicle rice and provide reference for the application of indica erect panicle type rice. The results showed that the ben-ding resistance of panicle neck of R1338 and R334 were significantly higher than that of wild type variety R498;the contents of cellulose and lignin in panicle of erect panicle mutant were significantly higher than that in the wild type,contents of cellulose of R1338 and R334 increased by 2. 76% and 1. 64% compared with wild type,the contents of lignin of R1338 and R334 increased by 17. 89% and 7. 98%,respectively;erect panicle mutant had bigger stem diameter,more contents of cellulose and lignin,better mechanical strength compared with wild type,eventually their spikes could keep erecting.%以通过EMS诱变籼稻品种蜀恢498( R498)获得的籼型水稻直立穗突变体R1338和R334为材料，研究籼型直立穗水稻穗部直立的原因，旨在为籼型直立穗水稻的应用提供参考。结果表明：直立穗R1338和R334的穗颈抗弯曲力极显著高于野生型弯曲穗品种R498；直立穗突变体穗部纤维素和木质素含量显著高于野生型， R1338和 R334纤维素含量分别较野生型提高2.76%和1.64%，木质素含量分别较野生型提高17.89%和7.98%；直立穗突变体具有更粗的直径且茎中含有更多的纤维素和木质素，比野生型具有更强的机械强度，最终导致穗直立。
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