摘要
为量化玉米果穗形状并明确逆境对其生长的影响,借助图像处理,用矩形度（E）、体积差（V）、纵向质心（L）、偏轴距（T）和球体度（S）分别表示矩形相似性、体积均等性、纵向及横向对称性和圆球相似性,对2种生长条件、2个玉米品种和2种去叶处理的试验结果进行聚类、典型变量和方差分析.结果表明：在吐丝后2周内形状变化明显,E（0.72~0.78）和S（0.40~0.48）上升,L（0.56~0.51）、T（0.02~0.01）和V（0.25~0.21）下降,以后各特征都趋于稳定.逆境（高种植密度,不施肥）使成熟期的E降低了4.5%,V扩大了17.7%,它们与穗长和穗粗结合,能够解释产量变化的87%~97%.纵观玉米果穗生长全过程,L、V和S3个形状参数对逆境较敏感,可作为逆境胁迫的量化指标.
To quantify the ear shape of corn（Zea mays L.） and to understand the effects of growth stress on the ear shape are of importance in corn crop science.By means of digital image analysis on whole ear RGB images,and using the definition of extent（E）,volumetric odds（V）,longitudinal centroid（L）,transverse centroid（T）,and sphericity（S） to represent the similarity to rectangle,volumetric equality,longitudinal symmetry,transverse symmetry,and similarity to sphere,respectively,the ear shape data from the field experiment with 2 corn cultivars,2 contrast growth conditions,and 2 defoliation treatments in a split plot design were analyzed by cluster analysis,canonical variate analysis,and variance analysis.It was found that within the first 2 weeks after silking,the ear shape varied obviously,namely,the E increased from 0.72 to 0.78,the S from 0.40 to 0.48,while the L decreased from 0.56 to 0.51,the T decreased from 0.02 to 0.01,and the V decreased from 0.25 to 0.21.Afterwards,all the 5 shape traits tended to be stable.Growth stress（high planting density and zero fertilizer application） shifted the E by-4.5% and the V by ＋17.7% at maturing stage,which,combined with the variation of ear length and width,contributed 87%-97% of grain yield change.Throughout the ear growth duration,the ear shape traits L,V,and S were more sensitive to growth stress,being considered as the potential quantitative indicators of stress.
出处
《应用生态学报》
CAS
CSCD
北大核心
2011年第7期1782-1788,共7页
Chinese Journal of Applied Ecology
基金
山东省科技攻关计划项目(2009GG10009005)
山东省农业重大应用技术创新项目(6207a7)
山西省归国留学人员项目(2003049)资助
关键词
玉米
果穗生长
逆境胁迫
形状
图像处理
corn（Zea mays L.）
ear growth
environmental stress
shape
image process
