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Physiological Characteristics of Roots in Two Line Indica Hybrid Rice

LI Yi song 1,HUANG Pi sheng 1,HUANG Zhong qing 2,DING Yan feng 1 (1 Key Lab of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095; 2 Department of Agronomy,Anhui Agricultural University)  
Effects of nitrogen supplying levels and planting densities on the bleeding intensity, content of amino acids and soluble carbohydrates of roots in two line indica hybrid rice X07S/Zihui100.The results showed:(1)Bleeding intensity at basal internode and panicle of X07S/Zihui100 was larger than that of Shanyou63 ,decrement of bleeding intensity at panicle node of X07S/Zihui100 was faster than that of Shanyou63 in latter growth period. Bleeding intensity was enhanced with lower planting density and mid nitrogen suppling level.(2)Total amino acids content of bleeding at internode of X07S/Zihui100 was lower than that of Shanyou63, was decreased with more planting densities and increased with higher nitrogen supplying level. Over high nitrogen level would induced amino acid content decrement at panicle node.(3)Maximum bleeding intensity at basal internode in one day emerged early than that at panicle node.(4)Soluble carbohydrates content of bleeding at internode was decreased with more planting density and nitrogen supplying level.In general ,spore planting density and higher nitrogen supplying was an efficient way for higher physiological activity of root in X07S/Zihui100.
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