作物学报 ›› 2014, Vol. 40 ›› Issue (08): 1435-1442.doi: 10.3724/SP.J.1006.2014.01435
冯海娟1,张善平1,马存金1,刘鹏1,*,董树亭1,赵斌1,张吉旺1,杨今胜2
FENG Hai-Juan1,ZHANG Shan-Ping1,MA Cun-Jin1,LIU Peng1,*,DONG Shu-Ting1,ZHAO Bin1,ZHANG Ji-Wang1,YANG Jin-Sheng2
摘要:
选用不同耐密型品种农大108和郑单958,设置3个种植密度,研究了种植密度对夏玉米基部第3茎节维管束显微结构和茎流速率的影响。结果表明,随种植密度增大,两品种基部茎节的横截面积、大小维管束数目和面积均显著减小,并导致总维管束数目和面积减小。两品种对种植密度的敏感度存在显著差异,农大108比郑单958受高密度影响更大。种植密度增加后,两品种茎流速率及8:00至17:00的总茎流量均显著减小,其中郑单958的降幅小于农大108;茎秆维管束的运输效率均有所提高,郑单958的升高幅度大于农大108。相关分析表明,两品种8:00至17:00的总茎流量与基部茎节的大维管束总面积呈显著正相关。郑单958具有在较高密度下较大幅度提高维管束运输效率的能力,表现出在维管束结构、茎流速率、总茎流量及运输效率上的优势,这可能是其具有较强耐密性,密植后仍能获得高产的原因之一。
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