大豆不同生殖生长期干旱胁迫条件下施磷对根系形态性状的影响(英文)

Effect of Phosphorus Application on Morphological Characters of Root Under Drought Stress at Different Reproductive Stages in Soybean

磷素(P)是提高植物抗水分胁迫能力的重要因子。选取大豆(Glycine maxL.Merrill)品种东农434进行盆栽试验,分别在大豆R1期(初花期)和R4期(盛荚期)进行干旱胁迫处理,解析P在干旱胁迫条件下对根系性状和产量的影响。试验设置4个施P水平,即0、7.3、14.6和29.2 mgkg-1。3个水份处理,即(1)全生育期维持田间持水量(FWC)的65%～75%为对照;(2)R1期控水为FWC的30%～40%;(3)R4期控水为FWC的30%～40%。结果表明,两个时期的干旱胁迫均显著影响根系性状,降低产量,且R4期比R1期严重。磷素营养显著改善干旱胁迫所引起的不利影响,增加根干重、根长、根表面积,进而减少大豆产量的损失。

of phosphorus （P）fertilizer is an important factor for improving the tolerance to water deficit in many plants. A pot experiment was conducted to identify the effects of P application on soybean adaptability to water deficit at the R1 （initial flowering） and R4 （full pod） stages through the investigation of root morphological traits and resultant yield in a soybean （Glycine max L. Merrill） cultivar （Dongnong 434）. The four levels of P application were 0,7.3, 14. 6 and 29.2 mg kg^-1 soil, respectively. The three soil moisture treatments were （1） 65% -75 %of field water capacity （FWC） as control, （2） 30%-40 % of FWC at the R1 stage,and （3） 30%- 40 % of FWC at the R4 stage. Results showed that root traits and yield were significantly reduced by drought stress at different growth stages,especially at the R4 stage. Application of P enabled to alleviate the adverse effects of drought, to increase the root dry weight, root length, root surface area and consequently yield.