Analysis of changes in minimal and maximal fluorescence yields with irradiance and o(2) level in tobacco leaf tissue.
Analysis of changes in minimal and maximal fluorescence yields with irradiance and o(2) level in tobacco leaf tissue.
复制标题
分析烟叶组织中最小和最大荧光产量随辐照度和 o(2) 水平的变化。
DOI：
10.1104/pp.96.1.172
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发表时间：
1991
期刊：
影响因子：
7.4
通讯作者：
R. Peterson
中科院分区：
文献类型：
--
作者：
R. Peterson
The responses of minimal and maximal fluorescence yields of chlorophyll a to irradiance of actinic white light were determined by pulse modulated fluorimetry in leaf discs from tobacco, Nicotiana tabacum, at 1.6, 20.5, and 42.0% (v/v) O(2). Steady-state maximal fluorescence yield (F(m)', measured during a saturating light pulse) declined with increasing irradiance at all O(2) levels. In contrast, the steady-state minimal fluorescence yield (F(o)', measured during a brief dark interval) increased with irradiance relative to that recorded for the fully dark-adapted leaf (F(o)) or that observed after 5 minutes of darkness (F(o) (*)). The relative magnitude of this increase was somewhat greater and extended to higher irradiances at the elevated O(2) levels compared with 1.6% O(2). Suppression of F(o)' was only observed consistently at saturating irradiance. The results are interpreted in terms of the occurrence of photosystem II units possessing exceedingly slow turnover times (i.e. "inactive" units). Inactive units play an important role, along with thermal deactivation of excited chlorophyll, in determining the response of in vivo fluorescence yield to changes in irradiance. Also, a significant interactive effect of O(2) concentration and the presence or absence of far red light on oxidation of photosystem II acceptors in the dark was noted.
影响因子：
7.4
作者：
DEMMIG, B;WINTER, K;CZYGAN, FC
通讯作者：
CZYGAN, FC