摘要： 以不同玉米杂交种为试材,在实验室和温室通过设置不同水分胁迫处理,研究了供试品种萌发特性和各器官干物质生产与分配情况,主要研究结果如下,随着水分胁迫强度的增加,玉米杂交种胚芽、胚根相对生长量和储藏物质转运率均呈下降趋势,根冠比呈上升趋势。在同一水分胁迫处理下,和其他品种相比,辽单539胚根的相对生长量和储藏物质转运率均较高,根冠比比正常水分(0 MPa)处理提高幅度也较大。灌浆期,供试品种各器官干物重:雌穗>茎秆>叶片>叶鞘>根系>雄穗。和重度水分胁迫处理(SS)相比,正常供水处理(CK)下,茎秆干物重下降明显,而雌穗干物重迅速增加。和其他品种相比,辽单527、辽单539和辽单31营养器官占生殖器官干物重比值在不同水分胁迫处理下变化较小,其中,辽单539营养器官占生殖器官干物重比例相对较小,且灌浆期,在不同水分胁迫处理下,其雌穗干物质分配比例相对较高,具耐旱丰产潜力。

关键词: 玉米, 聚乙二醇, 水分胁迫, 萌发特性, 干物质生产, 器官平衡

Abstract: Germination characteristic at seedling stage and dry matter production and distribution in different parts under different water stress treatments of different maize hybrids through the growth season was studied in lab and greenhouse,the main results was that relative growth of germ and radicle,and storage matter transport rate of maize hybrids were downtrend,however,root cap ratio of that showed an increasing tendency with increasing of water stress.Compare with other cultivars,relative growth of radicle and storage matter transport rate of Liaodan 539 were relative high at the same water stress treatment,increased rang of root cap ratio of Liaodan 539 was lager than that at normal water stress treatment(0 MPa).Dry matter weight of different parts of maize hybrids at filling stage was ear﹥stem﹥leaf﹥leaf sheath﹥root﹥tassel.Compared with SS treatment,dry matter of stem decreased significantly,however,that of ear increased rapidly at CK treatment.Variation of vegetative organs/reproductive organs dry matter ratio of Liaodan 527,Liaodan 539 and Liaodan 31 were lightly compared with other cultivars,among of them,vegetative organs/reproductive organs dry matter ratio of Liaodan 539 was relatively small.The ear dry matter distribution rate of Liaodan 539 was higher than that of other cultivars at different water stress treatment at filling stage,which had drought tolerant and high yield potential.

Key words: Maize, PEG Water stress, Germination characteristic, Dry matter production, Parts balance

中图分类号: 

• S513.01