NDLI: The Effect of CO$_{2}$ Enrichment on the Growth of Nodulated and Non-Nodulated Isogenic Types of Soybean Raised Under Two Nitrogen Concentrations

Content Provider	Springer Nature Link
Author	Nakamura, T. Koike, T. Lei, T. Ohashi, K. Shina, T. Tada, T.
Copyright Year	1999
Abstract	To find the effects of CO$_{2}$ enrichment on plant development and photosynthetic capacity of nodulated (line A62-1) and non-nodulated (line A62-2) isogenic lines of soybean (Glycine max Merr.), we examined the interactions among two CO$_{2}$ treatments (36±3 Pa = AC and 70±5 Pa = EC), and two nitrogen concentrations [0 g(N) m$^{−2}$(land area) = 0N; 30 g(N) m$^{−2}$(land area) = 30N]. Nodules were found in both CO$_{2}$ treatments in 0N of A62-1 where the number and dry mass of nodules increased from AC to EC. While the allocation of dry mass to root and shoot and the amount of N in each organ did not differ between the growth CO$_{2}$ concentrations, there was larger N allocation to roots in 0N than in 30N for A62-2. The CO$_{2}$-dependence of net photosynthetic rate (P $_{N}$) for A62-1 was unaffected by both CO$_{2}$ and N treatments. In contrast, the CO$_{2}$-dependence of P $_{N}$ was lower in 0N than in 30N for A62-2, but it was independent of CO$_{2}$ treatment. P $_{N}$ per unit N content was unaffected by CO$_{2}$ concentrations. The leaf area of both soybean lines grown in 30N increased in EC. But in 0N, only the nodulated A62-1 showed an increase in leaf area in EC. Nitrogen use efficiency of plants, NUE [(total dry mass of the plant)/(amount of N accumulated in the plant)] in 30N was unaffected by CO$_{2}$ treatments. In 0N, NUE in EC was lower than in AC in A62-1, and was higher than that at AC in A62-2. Hence, the larger amount and/or rate of N fixation with the increase of the sink-size of symbiotic microorganisms supplied adequate N to the plant under EC. In EC, N deficiency caused the down-regulation of the soybean plant.
Starting Page	61
Ending Page	70
Page Count	10
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	37
Issue Number	1
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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