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首页> 美国卫生研究院文献>Plant Physiology >On the Reason for the Different Photosynthetic Rates of Seedlings of Pinus silvestris and Betula verrucosa
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On the Reason for the Different Photosynthetic Rates of Seedlings of Pinus silvestris and Betula verrucosa

机译：樟子松和疣白桦幼苗光合速率不同的原因

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The growth and net photosynthetic properties of seedlings of Pinus silvestris L. and Betula verrucosa Ehrh., grown under identical conditions in a controlled environment chamber, were compared. The relative growth rate of birch was about twice that of pine. The rates of in situ net photosynthesis were 1.50 and 2.30 micromoles CO2 meter−2 second−1 and the photosynthetic quantum yields under light-limiting conditions were 0.022 and 0.032 for pine and birch, respectively. The total leaf surface areas were used for calculating the CO2 flux densities. The difference in the rates of in situ net photosynthesis depended equally on morphological and metabolic factors. It was assumed that a pronounced mutual shading and an unfavorable leaf inclination made the pine seedlings less efficient in absorbing the unidirectional light of the climate chamber than the broadleaved seedlings of birch. Both pine and birch were adapted to the growth conditions so the flux densities of absorbed quanta were rate-limiting for in situ net photosynthesis. It was concluded that the difference in the photosynthetic quantum yields (i.e. the linear slope of the photosynthetic light curve) of the two species defined the metabolically controlled part of the difference in the rate of in situ net photosynthesis. The quantum yield of pine was lower than that of birch and was partly explained by pine having a higher rate of photorespiration than birch. The remaining difference was most likely controlled by the properties of the chloroplast thylakoids, e.g. energy transfer efficiency between pigments, photosynthetic electron transport, or coupling between electron transport and photophosphorylation.
机译：比较了在相同条件下在受控环境室内生长的Pinus silvestris L.和Betula verrucosa Ehrh。幼苗的生长和净光合特性。桦树的相对生长速率约为松树的两倍。原位净光合作用速率为1.50和2.30微摩尔CO2米 -2 second -1 ，光限制条件下，松树和松树的光合作用量子产率分别为0.022和0.032。桦木。叶片的总表面积用于计算CO2通量密度。原位净光合作用速率的差异同样取决于形态和代谢因素。据推测，明显的相互遮蔽和不利的叶片倾斜使松树幼苗比桦木阔叶树苗吸收气候室的单向光效率低。松树和桦树都适应了生长条件，因此吸收的量子通量密度限制了原位净光合作用的速率。结论是，两种物种的光合作用量子产率的差异（即光合光曲线的线性斜率）定义了原位净光合作用速率的代谢控制部分。松树的量子产率低于桦木，部分原因是松树的光呼吸速率高于桦树。其余的差异很可能是由叶绿体类囊体的特性控制的。颜料之间的能量转移效率，光合作用的电子传输或电子传输与光磷酸化之间的耦合。

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