【摘要】 采用盆栽试验,选用和尚头、定西24、陇春8139三个春小麦品种分别进行两种水分处理(正常供水、干旱处理),在各生育期前10 d14CO2光合标记,孕穗期、开花期、灌浆期分别采样,测定其叶、茎、根、颖壳不同器官中14C同化物放射性。研究结果表明:春小麦发育过程中,14C同化物的分配中心随生育期的不同而改变,适当的干旱处理,能够促进根中同化物向地上器官的转移,增加穗中同化物量的积累。将春小麦三个品种相比较:在正常水分下,小根系的新品种陇春8139根中同化物滞留量较少,同化物主要分布在地上器官,有利于穗的生长;在干旱处理下,大根系的老品种和尚头根部没有同化物的冗余。更多还原

【Abstract】 Three varieties of spring wheat（Heshangtou,Dingxi24,Longchun8139） was studied by pot-cultivation experiment.The wheat were subjected to two water treatment（normal water supply and drought stress）and were labelled by ¹⁴CO₂ ten days before each stage.The radioactivity of different organs at booting stage,flowering stage and grain filling stage（leaves,stems,roots,ear shells） were measured.The result shows that in the process of wheat growth the transporting center of assimilation labelled(by ¹⁴CO₂) were altered in different stages,and proper drought treatment can promote the assimilation in root to transport to the above organs and increase the accumulation of assimilation in spike.Compared the three varieties in the normal water treatment the assimilation in the root of new species Longchun8139 is little.The assimilation distributed in the above organ that is good for the growth of spike;under drought stress the assimilation in the root of the old species Heshangtou is very little.更多还原