Spatial and temporal variations in the photosynthesis-nitrogen relationship in a Japanese cedar (Cryptomeria japonica D. Don) canopy

Kobayashi, Hiroshi; Inoue, Shintaro; Gyokusen, Koichiro

doi:10.1007/s11099-010-0031-6

Cited by 15 publications

(7 citation statements)

References 42 publications

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“…2). Pooled data for these eight sampling dates yield a linear equation of y = -3.16 + 3.17 x, r = 0.843, P<0.001, representing a more gentle slope than that of C. japonica (y = -5.81 + 4.50 x, Kobayashi et al 2010), obtained from similar sampling period (August, October, November, December and April). The slope of linear regression between P max and leaf N content of C. obtusa was significantly lower than C. japonica for data pooled for August and October (F = 4.66, P<0.05).…”

Section: --mentioning

confidence: 87%

Photosynthesis-nitrogen relationship in a Hinoki cypress (Chamaecyparis obtusa) canopy: a comparison with Japanese cedar (Cryptomeria japonica)

Kobayashi¹,

Inoue²,

Gyokusen³

2012

Photosynt.

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The relationship between light-saturated photosynthetic capacity (P max ) and leaf nitrogen (N) content was investigated for one year in a 15-year-old Chamaecyparis obtusa canopy and was compared with a Cryptomeria japonica canopy previously described. The linear regression between P max and leaf N content tended to converge toward a single line segment from July to January and in May for C. obtusa. The slope of the linear regression between P max and leaf N content of C. obtusa was gentler than that of C. japonica. The smaller regression coefficient of C. obtusa may reflect species differences in nitrogen nutrition requirements between C. obtusa and C. japonica. A pronounced decrease in the slope of the linear regression lines due to low temperature was observed in February and March. During this period, P max of C. obtusa declined more than that of C. japonica suggesting that C. obtusa is less tolerant to low temperatures than C. japonica.Additional key words: leaf nitrogen content; photosynthetic capacity; species difference; winter depression. --The Hinoki cypress [Chamaecyparis obtusa (Sieb. et Zucc.) Endl.] is a common plantation species that has become a symbol of Japanese traditional culture, together with the Japanese cedar (Cryptomeria japonica D. Don). C. obtusa and C. japonica have geographically similar natural distributions, and the planting area of the two species accounts for 65% of the total plantation area in Japan (C. obtusa 25%, C. japonica 40%). Recently, carbon dioxide (CO 2 ) absorption by these plantations has received attention from the standpoint of carbon sequestration and climate-change mitigation (e.g., Cannell 1999, Jandl et al. 2007.The light-saturated photosynthetic capacity (P max ) is positively correlated with leaf nitrogen (N) content in many plant species (Field and Mooney 1986). Using the P max -N relationship, the amount of CO 2 absorption has been calculated based on the leaf N content in many plant canopies (e.g., Hirose and Werger 1987, Hollinger 1996) including C. japonica (Kobayashi 2010). However, less information is available on photosynthetic traits for C. obtusa than for C. japonica, including the P max -N relationship and temperature dependency. In this study, we measured the P max -N relationship in a C. obtusa canopy over the course of a year and compared the results with the data for C. japonica, which we had described previously .Measurements were made in the Fukuoka Research Forest, a Kyushu University Forest located in Fukuoka, southwest Japan (33°38'N, 130°31'E, 79 m a.s.l.). The climatic zone of this area is warm-temperate. According to the annual report of the Kyushu University Forests for the study period from 2000 to 2001, the mean annual air temperature and annual precipitation were 15.8°C and 1,250 mm in 2000, and 15.7°C and 1,730 mm in 2001 (Fig. 1A).A 15-year-old stand of C. obtusa, planted at a density of 3,000 trees per hectare, was used in this study. Three neighboring trees of typical height and diameter --- -265-77-1533, e-mail: koba...

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Section: --mentioning

confidence: 87%

Photosynthesis-nitrogen relationship in a Hinoki cypress (Chamaecyparis obtusa) canopy: a comparison with Japanese cedar (Cryptomeria japonica)

Kobayashi¹,

Inoue²,

Gyokusen³

2012

Photosynt.

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“…In addition, cytokinin helps to increase nitrogen availability in leaves by inducing the upward transport of nitrogen from plant roots to leaves (Tamaki and Mercier 2007;Sakakibara et al 2006). The photosynthetic activity of plant leaves is increased by the accumulation of nitrogen (Kobayashi et al 2010(Kobayashi et al , 2012. Thus, cytokinin can also increase the photosynthetic capability of leaves and it plays a dominant role in leaf regrowth by inducing organic substance accumulation.…”

Section: (B)mentioning

confidence: 99%

Effects of leaf zeatin and zeatin riboside induced by different clipping heights on the regrowth capacity of ryegrass

Wang

Guo

Hou

et al. 2013

Ecological Research

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The effect of clipping height on ryegrass regrowth was investigated by examining the roles of several plant hormones. Our study consisted of three treatment conditions: (1) darkness over whole plants, (2) darkness only over stubble leaf sheaths, and (3) light over whole plants. Results showed that under darkness over whole plant, low stubble height resulted in low leaf regrowth biomass. Similar leaf regrowth biomass was observed under conditions of darkness only over stubble leaf sheaths as well as light over whole plants. Each unit weight of stubble at different clipping heights has relatively similar potential of providing stored organic substance for leaf regrowth. Therefore, regrowth index, calculated as newly grown leaf biomass divided by unit stubble weight, was used to evaluate regrowth capacity at different clipping heights under minimal influence of organic substances stored in stubbles. Under light over whole plants and single clipping, low stubble height and high stubble height with root thinning resulted in low leaf biomass and high regrowth index. On the other hand, under light over whole plants and frequent clipping high leaf biomass and regrowth index were observed in high stubble height. In addition, we found that leaf zeatin and zeatin riboside (Z + ZR) affected ryegrass regrowth and that roots regulated leaf Z + ZR concentration. Thus, our results indicate that root-derived cytokinin concentration in leaves influences ryegrass regrowth at different clipping heights.

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“…This phenomenon caused more cytokinin to be transported from the roots to increase the leaf cytokinin concentration in CL. Cytokinin helps increase photosynthetic activity (Kobayashi et al., 2010, 2012; Sakakibara et al., 2006; Tamaki & Mercier, 2007). Hence, P n was higher in CL than CT during regrowth.…”

Section: Discussionmentioning

confidence: 99%

Effects of rhizosphere soil nitrification on the compensatory growth of Italian ryegrass (Lolium multiflorum Lam) based on root‐produced cytokinin

et al. 2020

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Compensatory growth of forage grass can determine its optimal biomass, which is beneficial for increasing its production. The effect of rhizosphere soil nitrification on Italian ryegrass (Lolium multiflorum Lam) regrowth was investigated on the basis of root‐produced cytokinin concentration in leaves to reveal the forage grass compensatory growth mechanism. The nitrification inhibitor 3,4‐dimethylpyrazole phosphate was added to inhibit soil nitrification. Without soil nitrification being inhibited, compared with no clipping one defoliation cycle increased the leaf photosynthetic rate by 43.82%–53.79%, increased the leaf cytokinin content by 33.48%–34.73%, and increased the cytokinin transport from roots to leaves by 28.88%–39.47%. Nitrification inhibitor decreased soil nitrification rates by 23.33%–84.17% in the rhizosphere and by 42.71%–68.29% in the bulk soil during regrowth. In the rhizosphere micro‐environment, nitrification increased soil nitrate concentration that played an important role in the transport of cytokinin from roots to leaves during regrowth, increasing the leaf cytokinin concentration. However, bulk soil nitrification rate and nitrate content had little influence on leaf cytokinin concentration during regrowth. An increase in leaf cytokinin improved the photosynthesis and the regrowth. Without soil nitrification being inhibited, total biomass at the end of regrowth period was 1.09 times higher in plants that were defoliated once than in non‐clipped plants. However, soil nitrification inhibitor and two defoliation cycles decreased Italian ryegrass regrowth. Super compensatory growth occurred in the one defoliation cycle Italian ryegrasses without adding soil nitrification inhibitor. Compensatory growth occurred in once‐defoliated Italian ryegrass with adding soil nitrification inhibitor and in twice‐defoliated Italian ryegrass without adding soil nitrification inhibitor. In conclusion, rhizosphere soil nitrification is the key factor that regulates the compensatory growth of Italian ryegrass.

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Spatial and temporal variations in the photosynthesis-nitrogen relationship in a Japanese cedar (Cryptomeria japonica D. Don) canopy

Cited by 15 publications

References 42 publications

Photosynthesis-nitrogen relationship in a Hinoki cypress (Chamaecyparis obtusa) canopy: a comparison with Japanese cedar (Cryptomeria japonica)

Photosynthesis-nitrogen relationship in a Hinoki cypress (Chamaecyparis obtusa) canopy: a comparison with Japanese cedar (Cryptomeria japonica)

Effects of leaf zeatin and zeatin riboside induced by different clipping heights on the regrowth capacity of ryegrass

Effects of rhizosphere soil nitrification on the compensatory growth of Italian ryegrass (Lolium multiflorum Lam) based on root‐produced cytokinin

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