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The Functional Significance of Black-Pigmented Leaves: Photosynthesis, Photoprotection and Productivity in Ophiopogon planiscapus ‘Nigrescens’

机译:黑色素叶子的功能意义:麦冬“ Nigrescens”的光合作用,光保护和生产力

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摘要

Black pigmented leaves are common among horticultural cultivars, yet are extremely rare across natural plant populations. We hypothesised that black pigmentation would disadvantage a plant by reducing photosynthesis and therefore shoot productivity, but that this trait might also confer protective benefits by shielding chloroplasts against photo-oxidative stress. CO2 assimilation, chlorophyll a fluorescence, shoot biomass, and pigment concentrations were compared for near isogenic green- and black-leafed Ophiopogon planiscapus ‘Nigrescens’. The black leaves had lower maximum CO2 assimilation rates, higher light saturation points and higher quantum efficiencies of photosystem II (PSII) than green leaves. Under saturating light, PSII photochemistry was inactivated less and recovered more completely in the black leaves. In full sunlight, green plants branched more abundantly and accumulated shoot biomass quicker than the black plants; in the shade, productivities of the two morphs were comparable. The data indicate a light-screening, photoprotective role of foliar anthocyanins. However, limitations to photosynthetic carbon assimilation are relatively small, insufficient to explain the natural scarcity of black-leafed plants.
机译:黑色色素的叶子在园艺品种中很常见,但在天然植物种群中极为罕见。我们假设黑色色素沉着会通过减少光合作用而不利于植物生长并因此提高枝条的生产力,但是这种性状也可能通过屏蔽叶绿体免受光氧化胁迫而赋予保护作用。比较了近等基因的绿叶和黑叶麦冬'Nigrescens'的CO2同化,叶绿素a荧光,枝条生物量和色素浓度。与绿叶相比,黑叶具有较低的最大CO2同化率,较高的光饱和点和较高的光系统II(PSII)量子效率。在饱和光下,PSII光化学的失活较少,并且在黑叶中更完全地恢复。在充足的阳光下,绿色植物比黑色植物更丰富地分支,并较快地积累了芽生物量。在阴影下,两种形态的生产率是可比的。数据表明叶面花色苷具有遮光,光保护作用。但是,光合碳同化作用的限制相对较小,不足以解释黑叶植物的自然缺乏。

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