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Quantitative analysis of relationship between morphologic characters of leaf and root system in rice(Oryza sativa L.)

LIU Yong-xia1,YUE Yan-bin2,LIU Yan1,CAO Hong-xin1,GE Dao-kuo1,WEI Xiu-fang1(1.Institute of Agricultural Resources and Environment,Engineering Research Center for Digital Agriculture,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China;2.College of Agronomy,Nanjing Agricultural University,Nanjing 210095,China)  
The objectives of this study were to quantify the relationships among morphologic characters of leaf and root system in rice during the period of elongation to booting.Three high yield rice materials of Jiangsu Academy of Agricultural Sciences,Liangyou108(indica hybrid rice,V1),86you8(japonica hybrid rice,V2),and Nangjing43(japonica rice,V3),were planted in pots with loamy soil.There were two treatments of fertilizer: fertilizer of 3.6 g N,0.8 g P2O5 and 3.6 g K2O per pot and no fertilizer.Based on the experimental observations,the multifactor linear regression(MLR) models between morphologic parameters of leaf and root system were built.The variance of three MLR models was significant,and the fitness of models was very good.The average absolute deviation between simulated value and measured value of total root length,total root surface and total root volume were-176.506 cm per plant,8.784 cm2 per plant,and-1.624 cm3 per plant(n=24),the corresponding standard error of difference per plant were 31.542 cm,15.653 cm2,and 2.117 cm3,and the corresponding correlation coefficients were 0.913**,0.904** and 0.907**,respectively.The MLR models between the characteristic of leaf and morphology of root system from elongation to booting would be help to link the research of above-ground part with that of root system,cooperate visualizing rice plants above-ground with under-ground,and select high yield plant types and cultivation practices.
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