Abstract

Legume-Rhizobium symbiosis contribute substantially to nitrogen economy of the soil with global utilization in sustainable agricultural systems. Due to the immense importance of legumes, nodulation was studied in 66 Papilionoid species from Sacramento Valley in California. Majority of the species were abundantly nodulated under natural soil conditions or when grown in uninoculated garden soil indicating distribution of wide range of naturalized rhizobia. Nodulation in 12 species within 6 genera is reported for the first time. The general account presented here is essentially first step in quantifying the contribution of these nodulated species to the nitrogen cycle of the biosphere.

中文摘要

豆科植物與根瘤菌的共生對農地土壤中的氮肥力有很大的貢獻。由於豆科植物的重要性，本研究以生長在加州 Sacramento 山谷地區的 66 種蝶形花科植物之根瘤形成狀況加以觀察。生長在自然狀況的土壤中或是生長在未接種根瘤菌的園藝土壤中的品系均有很多根瘤的形成。本研究中有 6 屬 12 種植物是以前未被研究過的豆科植物。本研究初步探討這些具有根瘤的豆科植物於生物圈氮循環中的重要性。 關鍵詞：根瘤、豆科(蝶形花亞科)、加州。

Keyword: Nodulation, Leguminosae (Papilionoideae), California