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首页> 外文期刊>Plant and Soil >Preincubation of B-japonicum cells with genistein reduces the inhibitoryeffects of mineral nitrogen on soybean nodulation and nitrogen fixationunder field conditions
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Preincubation of B-japonicum cells with genistein reduces the inhibitoryeffects of mineral nitrogen on soybean nodulation and nitrogen fixationunder field conditions

机译：金雀异黄素对日本粳稻细胞的预培养降低了田间条件下矿质氮对大豆结瘤和固氮的抑制作用

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摘要

Genistein is the major root produced isoflavonoid inducer of nod genes in the symbiosis between B. japonicum and soybean plants. Reduction in the isoflavonoid content of the host plants has recently been suggested as a possible explanation for the inhibition of mineral nitrogen (N) on the establishment of the symbiosis. In order to determine whether genistein addition could overcome this inhibition, we incubated B. japonicum cells (strain 532C) with genistein. Mineral N (in the form of NH4NO3) was applied at 0, 20 and 100 kg ha(-1). The experiments were conducted on both a sandy-loam soil and a clay-loam soil. Preincubation of B. japonicum cells with genistein increased soybean nodule number and nodule weight, especially in the low-N-containing sandy-loam soil and the low N fertilizer treatment. Plant growth and yield were less affected by genistein preincubation treatments than nitrogen assimilation. Total plant nitrogen content was increased by the two genistein preincubation treatments at the early flowering stage. At maturity, shoot and total plant nitrogen contents were increased by the 40 mu M genistein preincubation treatment at the sandy-loam soil site. Total nitrogen contents were increased by the 20 mu M genistein preincubation treatment only at the 0 and 20 kg ha(-)1 nitrate levels in clay-loam soil. Forty mu M genistein preincubation treatment increased soybean yield on the sandy-loam soil. There was no difference among treatments for 100-seed weight. The results suggest that preincubation of B. japonicum cells with genistein could improve soybean nodulation and nitrogen fixation, and at least partially overcome the inhibition of mineral nitrogen on soybean nodulation and nitrogen fixation.
机译：金雀异黄素是日本根瘤菌与大豆植物之间共生的主要根源异源黄酮诱导性nod基因。最近有人提出减少宿主植物中异黄酮的含量可以作为抑制共生建立中矿质氮（N）的可能解释。为了确定染料木黄酮的添加是否可以克服这种抑制作用，我们用染料木黄酮孵育了日本血吸虫的细胞（菌株532C）。分别以0、20和100 kg ha（-1）施用矿物N（以NH4NO3形式）。在沙壤土和粘土壤土上均进行了实验。用染料木黄酮对日本血吸虫的细胞进行预培养会增加大豆根瘤数和根瘤重量，特别是在低氮含沙壤土和低氮肥料处理中。金雀异黄素预温育处理对植物生长和产量的影响小于氮同化作用。在早期开花期，通过两种染料木黄酮预温育处理增加了植物总氮含量。成熟时，通过在沙壤土土壤部位进行40 µM染料木黄酮的预温育处理，可以增加芽和植物总氮含量。仅在黏土壤土中硝酸盐浓度为0和20 kg ha（-）1时，通过20μMGenistein预温育处理，总氮含量才会增加。 40μMGenistein预温育处理增加了沙壤土上的大豆产量。 100粒重的处理之间没有差异。结果表明，染料木黄酮对日本血吸虫的细胞进行预培养可以改善大豆的结瘤和固氮作用，并至少部分克服了矿质氮对大豆的结瘤和固氮作用的抑制作用。

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