Effects of low nitrogen nutrition on plant growth characteristics and nitrogen accumulation in Chinese natural bermudagrass (Cynodon dactylon (L.) Pers.) germplasm resources
Effects of low nitrogen nutrition on plant growth characteristics and nitrogen accumulation in Chinese natural bermudagrass (Cynodon dactylon (L.) Pers.) germplasm resources
复制标题
低氮营养对中国天然狗牙根种质资源生长特性及氮素积累的影响
DOI：
10.1080/00380768.2018.1510716
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发表时间：
2018-11-02
影响因子：
2
通讯作者：
Liu, Jianxiu
中科院分区：
文献类型：
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作者：
Li, Dandan;Zong, Junqin;Liu, Jianxiu
狗牙根（Cynodon dactylon（L.）（.）是一种广泛应用的暖季型草坪草，并且在草坪草中具有最高的氮（N）施肥需求。在氮素缺乏的生境中发现的野生生态型可以潜在地耐受氮素限制条件，以减少草坪业的氮素投入。然而，其低氮耐受性的变化程度仍不清楚。我们进行了水培试验，以评估在正常（5 mM）和有限的（0.05 mM）N水平下的生长，N积累和分配的变化从中国预核心收藏的野生狗牙根在两个实验。结果表明，低氮营养显著降低了剪草生长，但对植株地上部和根系生长没有影响;剪草氮积累量的降低幅度大于植株地上部和根系。但除试验2中的根系含氮量外，其余性状均存在显著的遗传变异。通过聚类分析，将试验1中的56份材料和试验2中的12份材料分别分为4类和2类。具有上级低氮耐性的加入有改善的生长和积累更多的氮在绿荫和根;有趣的是，其他加入与低氮耐性有不同的耐受机制，并转移更多的N营养从根到剪草，以保持更好的草坪质量。耐低氮霉菌的差异表明，我国野生狗牙根资源耐低氮性的改良潜力很大。
Bermudagrass (Cynodon dactylon (L.) Pers.) is a widely used warm-season turfgrass and has the highest nitrogen (N) fertilization requirements among turfgrasses. Wild ecotype found in N-poor habitats can potentially tolerant N limiting conditions for reducing N inputs in the turf industry. However, the extent of variation in their low N tolerance has remained unclear. We conducted hydroponic experiments to evaluate the variation on growth, N accumulation, and partitioning of wild bermudagrass from China pre-core collection under normal (5 mM) and limited (0.05 mM) N levels in two experiments. The results showed that low N nutrition significantly decreased clipping growth, while had no effects on verdure and root growth; in addition, the magnitude of clippings N accumulation reduction was higher than verdure and root across all accessions. However, significant genetic variations in all studied traits except for root N content in experiment 2 were found among accessions. Using a cluster analysis, 56 accessions in experiment 1 and 12 accessions in experiment 2 were classified into four groups and two groups separately. The accessions with superior low N tolerance had improved growth and accumulated more N in the verdure and roots; it is interesting that other accessions with low N tolerance had different tolerance mechanisms and transferred more N nutrition from the roots to the clippings to maintain better turf quality. The different molds in low N tolerance suggest that there is much potential for improving low N tolerance among Chinese natural bermudagrass accessions.