A deep-rooting upland rice variety (Kinandang Patong) was evaluated for its growth response to bio-fertilization at early stages. Five non-native plant growth-promoting bacteria previously isolated from yams (Dioscorea spp.) were inoculated to upland rice under growth chamber and greenhouse conditions. Effects of the inoculation varied depending on bacterial strains and growing conditions. Growth of 14-day rice seedlings was improved by all tested bacterial strains. Under growth chamber, the strain S-333 increased plant length, shoot dry weight and nitrogen content as compared to the control, but total dry weight, nitrogen uptake, leaf chlorophyll content and number of tillers were higher with N fertilizer application. Under greenhouse conditions, most rice growth parameters were improved by inoculation with the strain S-7. The correlations between the bacterial plant-growth-promoting traits and rice growth parameters under growth chamber conditions were all negative for phosphate solubilization indexes. Our results suggest that bacterial inoculation can replace half (S-343 and S-611) of or the full (S-7) rate of chemical N fertilizer required, depending on bacterial strains and growing environments, although δ¹⁵N value in control plants was lower than in inoculated plants under growth chamber conditions, suggesting that the bacteria improve rice growth through mechanisms other than biological nitrogen fixation.

中文翻译：

---

非本地植物促生细菌接种旱稻的反应

评价了一种根深蒂固的旱稻品种（Kinandang Patong）在早期对生物施肥的生长响应。先前从山药中分离出的五种促进植物非本地生长的细菌（薯os）spp。）接种在生长室和温室条件下的旱稻上。接种的效果取决于细菌菌株和生长条件。所有测试的细菌菌株均可改善14天水稻幼苗的生长。在生长室下，菌株S-333与对照相比增加了植物的长度，枝条的干重和氮含量，但施用氮肥后总干重，氮素吸收，叶片叶绿素含量和分till数更高。在温室条件下，接种S-7菌株可以改善大多数水稻的生长参数。在生长室条件下，促进细菌生长的性状与水稻生长参数之间的相关性对磷酸盐增溶指数均呈负相关。在生长室条件下，对照植物的¹⁵ N值低于接种植物的¹⁵ N值，表明该细菌通过生物固氮以外的机制改善了水稻的生长。