Phosphorus supply affects the photosynthetic capacity of loblolly pine grown in elevated carbon dioxide.
Phosphorus supply affects the photosynthetic capacity of loblolly pine grown in elevated carbon dioxide.
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DOI：
10.1093/treephys/14.11.1229
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发表时间：
1994-11
期刊：
影响因子：
4
通讯作者：
J. Lewis;K. Griffin;R. B. Thomas;B. Strain
中科院分区：
文献类型：
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作者：
J. Lewis;K. Griffin;R. B. Thomas;B. Strain
以火炬松（PinustaedaL.）为试材，研究了磷素供应和菌根状况对火炬松光合能力对CO2浓度升高响应的影响。幼苗幼苗生长在温室中保持在35.5或71.0 Pa CO（2）在一个完整的析因实验中有或没有菌根接种物（Pisolithus tinctorius（E.A.）Coker & Couch）和足够或有限的磷供应。利用同化-内部CO（2）分压（C（i））曲线估算最大Rubisco活性（V（c，max））、电子传递介导的1，5-二磷酸核酮糖再生能力（J（max））、磷酸再生能力（PiRC）和日间呼吸速率（R（d））。与其他处理相比，限制磷的非菌根幼苗的V（c，max）和PiRC显着降低。在低磷处理中，CO2浓度升高通过增加PiRC提高了非菌根幼苗的光合能力，而在高磷处理中，CO2浓度升高导致了菌根幼苗的磷限制，对幼苗的光合能力没有影响。尽管对光合能力的影响多种多样，在高CO（2）处理的幼苗有较高的净同化率比在环境CO（2）处理的幼苗。我们的结论是，在长期暴露于高浓度的CO（2），磷供应影响光合能力，通过影响Rubisco活性和核酮糖1，5-二磷酸再生速率。
Effects of phosphorus supply and mycorrhizal status on the response of photosynthetic capacity to elevated CO(2) were investigated in loblolly pine (Pinus taeda L.) seedlings. Seedlings were grown in greenhouses maintained at either 35.5 or 71.0 Pa CO(2) in a full factorial experiment with or without mycorrhizal inoculum (Pisolithus tinctorius (Pers.) Coker & Couch) and with an adequate or a limiting supply of phosphorus. Assimilation versus internal CO(2) partial pressure (C(i)) curves were used to estimate maximum Rubisco activity (V(c,max)), electron transport mediated ribulose 1,5-bisphosphate regeneration capacity (J(max)), phosphate regeneration capacity (PiRC) and daytime respiration rates (R(d)). Nonmycorrhizal seedlings grown with limiting phosphorus had significantly reduced V(c,max) and PiRC compared to seedlings in other treatments. Elevated CO(2) increased photosynthetic capacity in nonmycorrhizal seedlings in the low phosphorus treatment by increasing PiRC, whereas it induced phosphorus limitation in mycorrhizal seedlings in the low phosphorus treatment and did not affect the photosynthetic capacity of seedlings in the high phosphorus treatment. Despite the variety of effects on photosynthetic capacity, seedlings in the elevated CO(2) treatments had higher net assimilation rates than seedlings in the ambient CO(2) treatments. We conclude that phosphorus supply affects photosynthetic capacity during long-term exposure to elevated CO(2) through effects on Rubisco activity and ribulose 1,5-bisphosphate regeneration rates.