摘要
在盆栽条件下,对八倍体糜子的生长生理特性和丰产性进行了探讨。结果表明:在叶片发育、植株高度、叶片数目及干物质积累上,八倍体比四倍体明显表现出劣势;根茎叶三器官的干物质积累量与总量的表现趋势一致;叶面积增长与干物质积累之间呈显著正相关(r=0.8691)。八倍体糜子较低的光合强度(Pn)、较小的叶面积(LA)和光合势(P.P)是导致干物质积累量小的重要原因。八倍体糜子的根系活力(RA)高,吸水能力强,气孔阻力(SR)小,蒸腾强度(Trao.R)大,脱水速度(DR)快,保水能力差,叶和茎的相对含水量(RWC)小,水分饱和亏(WSD)大,故水分利用效率(WUE)和抗旱性(DrR)比四倍体差。主穗分枝多,千粒重大,不孕小花数多,穗粒数少、结实率低、丰产性差是八倍体糜子的重要特点。
The pot experiment was conducted in order to study the growth, development, physiological characters and grain yield potentiality in octaploid of Panicum miliaceum L.. Results indicated that there are evident differences between octaploid and tetraploid in plant height, leaf developing, leaf number, drymatter accumulation, photosynthetic potentiality, root activity, transpiration intensity, relative water content, water saturation deficit, water use efficiency and droughtresistance. At the same time, analysing the relationships between photosynthetic rate and drymatter accumulation, water characters in plant body and drought-resistance.
出处
《西北植物学报》
CAS
CSCD
北大核心
1992年第1期52-58,共7页
Acta Botanica Boreali-Occidentalia Sinica
关键词
糜子
八倍体
四倍体
生理特性
Panicum miliaceum L. , octaploid, tetraploid, physiological character, drought-resistance.
