甘蓝型杂交油菜直播密度与主花序角果数的相关性  

Correlation Between Density and Pods on Main Inflorescence of Hybrid Brassica napus Under Direct Sowing Pattern

作　　者：胡权 赵继献[1] 戴祥来 任廷波 程国平[1] HU Quan;ZHAO Jixian;DAI Xianglai;REN Tingbo;CHENG Guoping(Rapeseed Institute,Guizhou Academy of Agricultural Sciences,Guiyang,Guizhou 550008,China)

机构地区：[1]贵州省农业科学院油菜研究所,贵州贵阳550008

出　　处：《贵州农业科学》2020年第3期50-53,共4页Guizhou Agricultural Sciences

基　　金：国家重点研发计划子课题“油菜优异种质资源精准鉴定与创新利用”(2016YFD0100202);贵州省现代农业产业技术体系建设项目“油菜产业技术体系建设”(GZCYTX2013-0802);贵州省科技计划项目“甘蓝型油菜千粒重遗传机制研究及大籽粒种质创制与应用”[黔科合支撑(2020)1Y106]。

摘　　要：为油菜机械直播适宜密度的确定及适应机械直播高密度条件的油菜品种选育提供科学参考,模拟机械直播高密度条件,进行648个甘蓝型杂交油菜组合不同密度田间直播试验,研究油菜直播密度与主花序角果数的相关性,探明不同播种密度对油菜产量的影响。结果表明:单株角果数与主花序角果数在密度26940株/667m 2时达最大值,在高密度条件(32205~46036株/667m^2)随直播密度增加呈递减趋势;直播密度与主花序角果数的相关系数为-0.3785,呈极显著负相关(P<0.01);主花序角果数与主花序角果长度、角粒数、主花序长度、单株角果数和单株产量的相关系数分别为0.1168、0.1560、0.7804、0.8198和0.7927,均呈极显著正相关(P<0.01)。甘蓝型杂交油菜直播密度通过主花序角果数影响其他产量构成因子,进而影响油菜的单株产量。油菜机械直播适宜密度为26940株/667m^2左右;甘蓝型杂交油菜尽可能选育主花序角果数多的材料,以弥补机械直播高密度条件造成主花序角果数减少的影响,使其适应油菜机械直播的轻简化发展方向。The correlation between direct-sowing density and pods on main inflorescence is studied by analyzing 648 hybrid Brassica napus combinations under different sowing densities(22463~46036 plants/667m^2)and simulating mechanical direct-sowing pattern with high density to explore the effect of different direct-sowing density on B.napus yield and to provide the scientific basis for selection of suitable B.napus sowing density under mechanical direct sowing pattern and breeding of B.napus variety with suitable for mechanical direct sowing pattern under high density condition.Result:The pods per plant and pods on main inflorescence reach the maximum under 26940 plants/667m 2 and both show the decreasing trend with increase of direct-sowing density under high density condition(32205~46036 plants/667m^2).The correlation coefficient between direct-sowing density and pods on main inflorescence is-0.3785,which shows a negative and very significant correlation(P<0.01).The correlation coefficient between pods on main inflorescence and pod length,seeds per pod,main inflorescence length,pods per plant and yield per plant is 0.1168,0.1560,0.7804,0.8198 and 0.7927 respectively,which shows the positive and very significant correlation(P<0.01).The direct-sowing density of B.napus under direct sowing pattern affects pods on main inflorescence and other yield components are affected by pods on main inflorescence,which affects yield per plant at last.The suitable mechanical direct-sowing density of hybrid B.napus is about 26940 plants/667m^2.Hybrid B.napus combinations with more pods on main inflorescence should be selected to recover the decrease of pods on main inflorescence due to mechanical direct sowing pattern with high density condition for simplified development direction of B.napus under mechanical direct sowing pattern.

关 键 词：甘蓝型油菜 主花序角果数 直播密度 植株性状 相关分析 

分 类 号：S565.4[农业科学—作物学]