拔节后糜子干物质积累及分配规律研究

Studies on dry matter accumulation and allocation of broomcorn millet (Panicum miliaceum L.) at late jointing stage

【目的】明确糜子拔节后期不同器官干物质的积累和分配规律。【方法】以榆糜3号为试验材料,采用田间试验,于拔节后测定糜子各器官干物质含量,研究糜子各器官干物质积累及转运的动态变化规律。【结果】糜子从拔节到成熟过程中,在拔节后34-48 d（籽粒灌浆期）,各器官干物质积累与分配量达到最大值;干物质积累呈＂S＂型曲线,符合＂慢-快-慢＂的增长规律。干物质积累过程表明,叶、茎、鞘、根系等器官干物质积累量与株高、穗长等生物学性状互为显著正相关。【结论】糜子籽粒产量的形成过程是植株干物质积累与分配的过程,在一定时间内分配到生殖器官的干物质量越多,其产量就越高。

[Objective] This research aimed to study dry matter accumulation and distribution in accumulation and of Panicum miliaceurn L. in different organ＇s at late jointing stage. [Method] The dry matter contents in different millet organs were determined and dynamic changes of the accumulation and trans- portation of dry matter among organs were studied by using Yu-Mi 3 and the pot method in field. [Result] The results indicated that dry matter accumulated and allocated to all organs was maximum 34--41 d after jointing（filling stage）;Dry matter accumulation showed a S curve at a slow-fast-slow rate. The dry matter accumulation process indicated that there was a significantly positive correlation between dry matter accumulation in leaf, stem, sheath, root and plant height, ear length and other biological characters. [Conclusion] The yield forming process of Panicurn rniliaceum L. was the process of dry matter accumulation and distribution. Within certain amount of time, the more dry matter distributed to reproductive organs, the higher the yield.