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以玉米自交系12SG188(高淀粉含量)和99038(低淀粉含量)为试材,采用石英砂盆栽方法,研究了磷素和水分对玉米自交系根系形态及植株体内磷素吸收分配的影响。结果表明,高淀粉玉米自交系12SG188生长期内植株根系数量、总叶面积、干物质积累和磷吸收效率均高于低淀粉玉米自交系99038。无论水分胁迫与否,随供磷量的增加,两个玉米自交系植株总叶面积和干物质积累量均显著增加,而水分胁迫对99038植株干物质积累的影响较12SG188更大。12SG188磷的总积累量的增加量低磷水分胁迫处理大于低磷正常水分处理,且大于99038低磷水分胁迫处理。99038磷的总积累量的增加量高磷正常水分处理大于高磷水分胁迫处理,且大于12SG188高磷正常水分处理。可见,12SG188玉米自交系较99038具有较高的磷素吸收效率,较99038更耐低磷耐旱。12SG188高磷正常水分条件下木质部汁液磷总运输量和韧皮部磷的再循环量最高,99038低磷水分胁迫条件下木质部和韧皮部中磷的总运输量最低。
The effect of phosphorus and water on the root morphology of maize inbred lines and the absorption and distribution of phosphorus in plants was studied using corn inbred lines 12SG188 (high starch content) and 99038 (low starch content) as test materials. . The results showed that root number, total leaf area, dry matter accumulation and phosphorus uptake efficiency of high starch maize inbred line 12SG188 were all higher than those of low starch maize inbred line 99038. Regardless of water stress or not, the total leaf area and dry matter accumulation of two maize inbred lines increased significantly with the increase of P supply, but the water stress had a greater impact on dry matter accumulation of 99038 than 12SG188. The total phosphorus accumulation of 12SG188 was lower than that of low phosphorus and higher than that of low phosphorus. 99038 The increase of the total phosphorus accumulation The high phosphorus normal water treatment is greater than the high phosphorus water stress treatment, and more than 12SG188 high phosphorus normal moisture treatment. Visible, 12SG188 maize inbred line 99038 has a higher phosphorus uptake efficiency, more resistant to low-phosphorus 99038 drought. Under 12SG188 high-phosphorus normal moisture condition, the total phosphorus transport and phosphorus recycle of phloem were the highest in xylem juice. The total phosphorus transport in xylem and phloem was the lowest under 99038 low phosphorus stress.