Temporal water stress effects on nodulation, nitrogen accumulation and growth of soybean
Temporal water stress effects on nodulation, nitrogen accumulation and growth of soybean
复制标题
暂时水分胁迫对大豆结瘤、氮素积累和生长的影响
DOI：
10.1007/bf02370289
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发表时间：
1989
期刊：
影响因子：
4.9
通讯作者：
Felipe Zapata
中科院分区：
文献类型：
--
作者：
C. Kirda;S. Danso;Felipe Zapata
研究了常规浇水大豆（Glycine max. L.）将植物与在14 - 47天的不同干旱胁迫持续时间下生长的那些植物进行比较（D）。在V3（三个节点）和R7（生理成熟）生长阶段之间施加应力。干旱胁迫分为轻度、中度和重度，分别对应于从V3到R2（18 D）或R5到R7（14 D）的一个干旱周期，从V3到R5（33 D）或R2到R7（29 D）的两个干旱周期，以及从V3到R7（47 D）的三个连续干旱周期。在R7阶段（种植后76天）收获植物。各处理下的A值差异不显著（P> 0.05），说明干旱对土壤有效氮的影响不大。然而，A值评估的植物（其中包括N2固定），治疗之间的差异显着。除了在最长的胁迫条件下，所有的植物（在两种基因型）吸收土壤氮的量相似，但固定在植物的N2不同，显着的治疗。定期浇水的植物从固定中获得最高量（68 mg植物-1）和比例（46.1%）的N，水分胁迫导致固定的N2显着减少。尽管水分胁迫对植物的生长都有不利影响，但这并不像对N2固定的影响那么大。固氮作用对干旱最敏感，其次是植物生长，最不敏感的是土壤吸氮量。
The N accumulation and growth of regularly watered soybean (Glycine max.L.) plants were compared with those grown under various durations of drought stress varying from 14 to 47 days (D). The stresses were imposed between the V3(three nodes) and R7(physiological maturity) growth stages. The stress was defined as eithermild, moderateorsevere, corresponding to (i), a single drought cycle from V3to R2(18 D) or R5to R7(14 D), (ii) double cycle from V3to R5(33 D) or R2to R7(29 D), and (iii) three continuous cycles from V3to R7(47 D), respectively. Plants were harvested at the R7stage (76 days after planting). The A-values measured by the non-nodulated plants under all treatments were similar (P<0.05), indicating that the available amount of soil N was not changed by drought. However, the A-values assessed by the nodulated plants (which included the N2fixed), differed significantly among treatments. Except under the longest stress condition, all plants (in both genotypes) absorbed similar amounts of soil N, but N2fixed in the nodulated plants differed, significantly among treatments. The regularly-watered plants derived the highest amount (68 mg plant−1) and proportion (46.1%) of N from fixation, and the water stresses resulted in significant reductions in N2fixed. Although the growth of both nodulated and non-nodulated plants, was adversely affected by water stress, this was not as great as was the effect on N2fixation. Nitrogen fixation was the most sensitive parameter to drought, followed by plant growth, and the least sensitive was soil N uptake.