Complete contact of Brassica roots with phosphorus fertilizer in a phosphorus-deficient soil
Complete contact of Brassica roots with phosphorus fertilizer in a phosphorus-deficient soil
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缺磷土壤中甘蓝根与磷肥的完全接触
DOI：
10.1080/00380768.2002.10408711
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发表时间：
2002
影响因子：
2
通讯作者：
Nobuko Wada
中科院分区：
文献类型：
--
作者：
M. Nanzyo;Y. Shibata;Nobuko Wada
摘要利用悬浮有粉状磷酸二钙（DCPD）的海藻酸盐凝胶珠（DCPD凝胶珠），观察了芸苔侧根对磷的优先生长，并对磷肥进行了筛选。DCPD凝胶珠能够检测其周围的特征根生长，因为它们的直径（1.5厘米）比标准肥料颗粒。薄的芸苔属侧根完全包围DCPD凝胶珠，并且在根和DCPD凝胶珠之间没有土壤区域。芸苔属植物根的这种形态可塑性非常适合于提高P回收率，因为即使在植物根和P肥料之间具有高P保持能力的几mm土壤也会降低P回收率。磷在芸苔地上部的回收率超过0.05，DCPD凝胶珠处理区地上部干重与对照区的比超过10。因此，芸苔属植物表现出高的磷回收率和令人满意的生长在缺磷土壤中与其他测试植物相比，由于它们的根和DCPD凝胶珠之间的完全接触。在供试的20株植物中，荞麦和芸苔属植物的根系对磷的吸收也表现出明显的优势。
Abstract The preferential development of Brassica lateral roots for phosphorus (P) to forage for P fertilizer was observed by using alginate gel beads in which powdery dicalcium phosphate dihydrate (DCPD) was suspended (DCPD gel bead). The DCPD gel beads enabled to detect the characteristic root growth around them because of their larger diameter (1.5 cm) than that of standard fertilizer particles. The thin Brassica lateral roots completely encircled the DCPD gel beads and no soil area remained between the roots and the DCPD gel beads. This morphological plasticity of Brassica roots is highly suitable for improving the P recovery rate because even a few mm of soil with a high P retention capacity between a plant root and P fertilizer reduces the P recovery rate. The P recovery rate in the Brassica shoots exceeded 0.05 and the ratio of the shoot dry weight in the plot treated with DCPD gel beads to that in the control plot exceeded 10. Thus, the Brassica plants showed both a high P recovery rate and satisfactory growth in the P-deficient soil compared with other tested plants due to the complete contact between their roots and the DCPD gel beads. The preferential root proliferation for P was also observed in Fagopyrum esculentum Moench as well as Brassica plants among the 20 tested plants.