Wide variation of winter-induced sustained thermal energy dissipation in conifers: a common-garden study
Wide variation of winter-induced sustained thermal energy dissipation in conifers: a common-garden study
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冬季引起的针叶树持续热能耗散的广泛变化：一项普通花园研究
DOI：
10.1007/s00442-021-05038-y
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发表时间：
2021
期刊：
影响因子：
2.7
通讯作者：
Bowling, D. R.
中科院分区：
文献类型：
--
作者：
Walter-McNeill, A.;Garcia, M. A.;Logan, B. A.;Bombard, D. M.;Reblin, J. S.;Lopez, S.;Southwick, C. D.;Sparrow, E. L.;Bowling, D. R.
冬季的低温会抑制光合作用的速率，这在万年青植物中会加剧光吸收和光化学光利用之间的不平衡。通过在称为能量耗散的过程中将激发能转化为热量，可以最大限度地减少过量光吸收增加可能造成的损害，该过程涉及叶黄素循环的去环氧化类胡萝卜素。越冬的常绿植物采用持续的能量耗散形式，即使在漫长的黑暗驯化后也能观察到。而大多数光保护能量耗散的研究都只研究一种或少数物种;在这里，我们测量了美国犹他州湖城红丘花园在普通花园条件下户外生长的七十种针叶树分类群的持续热能耗散水平（还对四十九种分类群进行了针叶色素含量采样）。我们观察到一个非常广泛的冬季参与持续的能量耗散的百分比下降，从夏季到冬季的黑暗驯化的光系统II量子效率从6到95%不等。 许多色素为基础的参数测量，量子效率的季节性下降的幅度是最密切相关的玉米黄质含量的季节性增加表示的总叶绿素的基础上，这只解释了略多于三分之一的变化。我们没有发现证据表明，一个一致的冬季减少针叶叶绿素含量。因此，冬季减少太阳能诱导的荧光万年青森林发出的普遍机制可能是荧光量子产率的下降，冬季部署持续的能量耗散可能是这种效果的基础。
Low temperature in winter depresses rates of photosynthesis, which, in evergreen plants, can exacerbate imbalances between light absorption and photochemical light use. Damage that could result from increased excess light absorption is minimized by the conversion of excitation energy to heat in a process known as energy dissipation, which involves the de-epoxidized carotenoids of the xanthophyll cycle. Overwintering evergreens employ sustained forms of energy dissipation observable even after lengthy periods of dark acclimation. Whereas most studies of photoprotective energy dissipation examine one or a small number of species; here, we measured the levels of sustained thermal energy dissipation of seventy conifer taxa growing outdoors under common-garden conditions at the Red Butte Garden in Salt Lake City, Utah, U.S.A. (forty nine taxa were also sampled for needle pigment content). We observed an extremely wide range of wintertime engagement of sustained energy dissipation; the percentage decrease in dark-acclimated photosystem II quantum efficiency from summer to winter ranged from 6 to 95%. Of the many pigment-based parameters measured, the magnitude of the seasonal decrease in quantum efficiency was most closely associated with the seasonal increase in zeaxanthin content expressed on a total chlorophyll basis, which explained only slightly more than one-third of the variation. We did not find evidence for a consistent wintertime decrease in needle chlorophyll content. Thus, the prevailing mechanism for winter decreases in solar-induced fluorescence emitted by evergreen forests may be decreases in fluorescence quantum yield, and wintertime deployment of sustained energy dissipation likely underlies this effect.
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影响因子：
5.6
作者：
Strimbeck GR;Schaberg PG;Fossdal CG;Schröder WP;Kjellsen TD
通讯作者：
Kjellsen TD
氧代谢和应激生理学
影响因子：
3.9
作者：
B. Logan
通讯作者：
B. Logan
香脂冷杉（Abies balsamea）针叶中碳水化合物和水分含量的季节性变化。
影响因子：
1.1
作者：
C. Little
通讯作者：
C. Little
影响因子：
6.4
作者：
Miguez, Fatima;Fernandez-Marin, Beatriz;Ignacio Garcia-Plazaola, Jose
通讯作者：
Ignacio Garcia-Plazaola, Jose
影响因子：
2.7
作者：
HATCHER, PE
通讯作者：
HATCHER, PE