Photosynthetic characteristics of a tropical forest understory herb, Alocasia macrorrhiza, and a related crop species, Colocasia esculenta grown in contrasting light environments
Photosynthetic characteristics of a tropical forest understory herb, Alocasia macrorrhiza, and a related crop species, Colocasia esculenta grown in contrasting light environments
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DOI：
10.1007/bf00378239
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发表时间：
1989-04
期刊：
影响因子：
2.7
通讯作者：
D. Sims;R. W. Pearcy
中科院分区：
文献类型：
--
作者：
D. Sims;R. W. Pearcy
测定了热带森林林下的耐阴树种大根绿地莲和开阔沼泽地区的人工栽培树种绿地莲对2 - 60%全日照5种光环境的光合适应性。随着光子通量密度（PFD）的增加，两种植物的光合能力增加了近3倍。然而，在给定的环境中，c的光合能力。鱼的数量是a的两倍。macrorrhiza。气孔限制只解释了这种差异的一小部分。呼吸速率和估计的生化能力与光合能力平行增加。根据光合作用对co2的依赖性，RuBP再生能力与羧化能力的比值在物种和环境之间均无差异。随着生长PFD的增加，两种植物的量子产率仅略有下降，这表明在高PFD下光抑制的证据很少。本文就这两种植物的驯化机制和局限性进行了讨论。
Photosynthetic acclimation to 5 light environments ranging from 2 to 60% full sun was determined inAlocasia macrorrhiza, a shade tolerant species from tropical forest understories, andColocasia esculenta, a cultivated species which occurs naturally in open marshy areas. Photosynthetic capacities of both species increased nearly 3 fold with increased photon flux density (PFD). In a given environment, however, photosynthetic capacities ofC. esculentawere double those ofA. macrorrhiza. Stomatal limitations explained only a small part of this difference. Respiration rates and estimated biochemical capacities increased in parallel to photosynthetic capacity. No differences were observed either between species or environments in the ratio of RuBP regeneration capacity to carboxylation capacity as determined from the CO2dependence response of photosynthesis. Quantum yields of both species decreased only slightly with increasing growth PFD, providing little evidence for photoinhibition at high PFD. The results are discussed in terms of the mechanisms of and limitations on acclimation in these two species.