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对造成水分亏缺的沙土盆栽的番茄植株 (Lycopersionexcalentum Mill)设置了 3种施氮水平 ,研究其对渗透调节的影响。采用每日滴灌的方式 ,使植株保持在田间持水量水平的土壤中 ,直至胁迫发生。每处理灌溉量为 1 0 0ml,氮 0 (N0 )处理为荷格兰特 (Hoagland)培养液 ;氮 1(N1 )处理为Hoagland培养液加 60mmolNO-3 ;氮 2 (N2 )处理 :为Hoagland培养液加 1 1 0mmolNO-3 。停止灌溉 3d后 ,叶片渗透调节百分率 (叶片实际渗透势占供水良好状态下叶片渗透势的百分数 )分别为N0植株 44%,N1植株 63%,N2植株 2 9%。停止供水 8d后的百分率与之相似。在停止供水 3d后 ,对一些植株恢复每天灌溉。当胁迫解除结束时 (灌溉 8d后 ) ,叶片渗透势较低 ( - 1 .8MPa) ,在Nl中仍保持着渗透调节的状态 ( 39%) ,这与水势降低的情况下 ,膨压的保持有关。结果表明 ,N1处理可能具有增强番茄植株避脱水性和耐脱性的效应
Three nitrogen application rates were set for tomato plants (Lycopersion cercopitana Mill) that caused water deficit in sand potted plants and their effects on osmotic adjustment were investigated. Daily drip irrigation is used to keep the plants in the soil at the field level until the stress occurs. The amount of irrigation for each treatment was 100 ml, the treatment of Hoagland with nitrogen 0 (N0), the treatment with Hoagland with 60 mmol of NO-3 (nitrogen 1) and the treatment with Hoagland Add 110 mmol of NO-3. The percentages of leaf osmotic adjustment (percentage of actual leaf osmotic potential under the condition of good water supply) were 44% for N0, 63% for N1 and 29% for N2, respectively. The percentage of water stopped after 8d is similar. After stopping water supply for 3d, restore some plants to daily irrigation. At the end of stress relief (after 8 days of irrigation), leaf osmotic potential was low (-1.8 MPa) and remained infiltrative (39%) in Nl, which was consistent with reduced turgor pressure related. The results showed that N1 treatment may have the effect of enhancing the avoidance of water and detachability of tomato plants