利用14 CO2 对小麦花前光合标记 ,在开花灌浆全期通过对对照 (CK)、中度胁迫(MS)、严重胁迫 (SS) 3个水分处理试验表明 :在灌浆过程中 ,中度胁迫处理叶中花前14 C 同化物输出比例为 1 6 56% ,略高于对照和严重胁迫 ,收获时同化物滞留最少( 8 68% )。严重胁迫处理颖壳中14 C 同化物外运比例最高 ,为 8 70 % ,约为对照和中度胁迫处理的 2倍。 3种水分处理茎中同化物输出比例不明显。胁迫程度增加 ,旗叶中同化物输出比例和撤退量增加 ,籽粒对同化物调运速度与比例增加。表明水分亏缺促进了籽粒对花前叶、鞘、颖壳等“临时库”同化物的再动员以及对后期产量的补偿 The photosynthetic markers of wheat pre-anthesis were quantified by 14 CO2 treatment. Three water treatments including CK, moderate stress (SS) and severe stress (SS) during flowering stage showed that during the filling stage, moderate stress treatment The ratio of 14C assimilate output before flowering was 1 566%, slightly higher than the control and severe stress, with the least assimilate retention at harvest (8 68%). The highest proportion of 14 C assimilate in severe stress treatment of glume was 8 70%, which was about 2 times that of control and moderate stress treatments. 3 kinds of water treatment stems assimilate output ratio is not obvious. The degree of stress increased, the proportion and withdrawn amount of assimilates in flag leaves increased, and the rate and proportion of assimilate transport increased. The results showed that water deficit promoted the mobilization of the “temporary pool” assimilates of seeds to the anterior leaf, sheath and glume, and the compensation of the late yield