不同水稻品种磷利用效率与耐铝性的关系研究

铝毒和磷缺乏是酸性土壤上作物生产的主要限制因子。本研究中我们探究了5个粳稻和5个籼稻品种的磷利用效率和耐铝性之间的相互关系。结果表明,粳稻品种的耐铝性显著高于籼稻品种。对于耐铝性强的水稻品种,施加磷肥后地上部生物量显著增加,而铝敏感的品种对磷肥响应较小,这可能是由于其耐铝性差而酸性土壤中的铝毒导致根系结构和功能受损,从而影响养分的吸收和利用。不同水稻品种的耐铝性和磷吸收效率呈正比而与磷利用效率呈反比,且粳稻的地上部磷浓度及磷吸收效率高于籼稻,但磷利用效率则低于籼稻。这些结果对于酸性土壤中筛选耐铝和磷高效利用的水稻品种具有重要意义。

Correlation Between Phosphorus-use Efficiency and Aluminum Tolerance in Different Rice Varieties

Both aluminum(Al)toxicity and phosphorus(P)deficiency are limiting factors of crop production on acid soil.In the present study,The correlation between P-use efficiency and Al tolerance in five japonica and five indica rice varieties was investigated.Aluminum tolerance of japonica varieties was significantly higher than those of indica varieties.The shoot dry weight of Al-resistant varieties increased significantly after P application in acid soil,but that of Al-sensitive varieties did not respond to P application.This difference in P-increased growth is probably due to Al-damaged root structure and function in Al-sensitive varieties,resulting in decreased uptake and utilization of nutrients from soil.We found that P-use efficiency was negatively correlated to Al tolerance,while P-uptake ability was positively correlated with Al tolerance.Furthermore,japonica varieties had a higher shoot P concentration and P-uptake ability compared with indica varieties,but had a lower P-use efficiency.These results provided a valuable insight into screening rice varieties with high Al tolerance and P-use efficiency in acid soils.