PHOSPHORUS NUTRITION AND MYCORRHIZAL GROWTH RESPONSE OF BROADLEAF AND NARROWLEAF BIRDSFOOT TREFOILS
PHOSPHORUS NUTRITION AND MYCORRHIZAL GROWTH RESPONSE OF BROADLEAF AND NARROWLEAF BIRDSFOOT TREFOILS
复制标题
阔叶、窄叶鸟足三叶草磷素营养及菌根生长反应
DOI：
10.1081/pln-100000321
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发表时间：
2001
影响因子：
2.1
通讯作者：
R. Mendoza
中科院分区：
文献类型：
--
作者：
R. Mendoza
在阿根廷，窄叶三叶草（lotusglaber）比阔叶三叶草（lotuscorniculatus）占优势。研究人员认为，这种优势发生的原因是绿草在低磷水平下生长得更好。研究了在低速效磷土壤中，圆叶荷花和秃毛荷花增加磷营养和菌根生长响应的效果，圆叶荷花比秃毛荷花对磷的利用效率更高，单位磷的茎组织产量也更高。达到最大芽产量90%所需的临界磷浓度，圆叶荷花为0.22，秃毛荷花为0.28。两种植物的根系都受到丛枝微根菌（AM）的严重侵染，菌根和非菌根植物对土壤中添加磷的反应都很强烈。这表明无论是菌根还是非菌根，这两个物种都没有优势或劣势。在低磷添加水平下，AM真菌的定植根比例在不同物种之间存在差异，而在高磷添加水平下，AM真菌的定植根比例基本相同。当磷含量不足以达到最大生长时，菌根植物的比根长度（cm g−1）在L. corniculatus中最大。低磷营养水平下较低的临界磷浓度和较高的比根长可能是在低磷土壤中白杨优于白杨的原因。因此，白杨优于白杨在阿根廷土壤中的优势并不是由于白杨在低磷有效度土壤中生长得更好。
In Argentina narrowleaf trefoil (Lotus glaber) predominates over broadleaf trefoil (Lotus corniculatus). Researchers have suggested this predominance occurs because L. glaber grows better at low levels of P availability. I studied the effect of increasing phosphorus (P) nutrition and mycorrhizal growth response of Lotus corniculatus and Lotus glaber in a soil of low available P. L. corniculatus was more efficient in P utilization than L. glaber and produced larger yields of shoot tissue per unit of P. The critical P concentration, measured as a percentage of P in the shoot required to achieve 90% of maximum shoot yield, was 0.22 in L. corniculatus and 0.28 in L. glaber. The roots of both two species were heavily infected by arbuscular micorrhizae (AM), and both mycorrhizal and nonmycorrhizal plants responded strongly to added P in soil. This suggests that both species are at no advantage or disadvantage whether mycorrhizal or nonmicorrhizal. The fraction of roots colonized by AM fungi differed between species at low levels of added P but was similar at high levels of added P. The specific root length (cm g−1) of mycorrhizal plants was greatest in L. corniculatus when P was insufficient to achieve maximum growth. The lower critical P concentration and the higher specific root length at low levels of P nutrition may be why L. corniculatus is superior to L. glaber in soils low in P. Therefore, the predominance of L. glaber compared with L. corniculatus in Argentinean soils is not due to ability of L. glaber to grow better in soil at low levels of P availability.