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- W2162958989 abstract "In areas with short growing seasons, poor early vegetative growth of soybean ( Glycine max [L.] Merr.) is often attributed to the restrictive effect of cool soil conditions on nodulation and N 2 ‐fixation by this subtropical grain legume. However, there are few studies regarding potential genetic variability of soybean and Bradyrhizobium japonicum genotypes for nodulation at cool root‐zone temperatures (RZT). Experiments were conducted to (1) test for a threshold temperature for low RZT inhibition of soybean nodulation and (2) ascertain whether this threshold temperature response depends mainly on the micro‐ or macrosymbiont. In experiment 1 soybean seedlings ( Glycine max [L.] Merr. cv. Maple Arrow) were inoculated with 1 ml of a log phase culture of B. japonicum strain 532C, H8 or H15 (the latter two strains were isolated from cold soils of Hokkaido, northern Japan) and maintained at either 16, 17.5, 19 or 25°C RZT. In experiment 2 seedlings of cv. Maple Arrow and a cold‐tolerant Evans isoline were combined with strain 532C and two Hokkaido strains (H5, H30) at both 19 and 25°C RZT. Results indicated that N 2 ‐fixation at 44 days after inoculation was substantially reduced (30–40%) by RZT as high as 19°C, due to development of less nodule mass and to a delay in the onset of N 2 ‐fixation and a small decrease in the number of nodules formed. However, the number of nodules formed was sharply reduced and the time required for the first appearance of nodules was significantly delayed below an RZT of 17.5°C. Differences between cultivars for nodulation and N accumulation were apparent at 25°C, but were abolished by growth at 19°C, indicating that, in spite of differences in growth potential between the cultivars under optimum RZT, both cultivars were equally limited by low RZT. Differences between B. japonicum strains were consistent across temperatures and were largely attributable to higher rates of specific nodule activity recorded for strain 532C, which seemed well adapted to low RZT. These results suggest that the host plant mediates the sensitivity of N 2 ‐fixation under low RZT and that inoculation with B. japonicum strains from cold environments is unlikely to enhance soybean N 2 ‐fixation under cool soil conditions." @default.
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- W2162958989 date "1994-01-01" @default.
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- W2162958989 title "The effects of low root‐zone temperature stress on two soybean (<i>Glycine max</i>) genotypes when combined with <i>Bradyrhizobium</i> strains of varying geographic origin" @default.
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- W2162958989 doi "https://doi.org/10.1111/j.1399-3054.1994.tb02199.x" @default.
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