The negative impact of shade on photosynthetic efficiency in sugarcane may reflect a metabolic bottleneck
The negative impact of shade on photosynthetic efficiency in sugarcane may reflect a metabolic bottleneck
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遮荫对甘蔗光合效率的负面影响可能反映了代谢瓶颈
DOI：
10.1016/j.envexpbot.2023.105351
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发表时间：
2023
影响因子：
5.7
通讯作者：
Sales C
中科院分区：
文献类型：
--
作者：
Sales C
具有c4代谢的植物通常比c31代谢的植物具有更高的光合速率。因此，已知的几种产量最高的物种是NADP-ME c4草，如甘蔗和玉米。然而，c4循环的优点在强光下最为明显，因为二氧化碳的浓缩机制是以额外的ATP为代价的。最近的研究表明，遮荫对NADP-ME c4grass的负面影响，导致co2同化的最大量子效率下调（co2,max）。光合效率下降背后的机制以及这些结果是否适用于其他c4作物物种和一个物种的种质尚不清楚。我们分析了4个甘蔗基因型对遮荫的光合适应性和产量的对比。为了找出叶片历史的影响，即遮荫对在充分阳光下发育并随后暴露于遮荫下的叶片的影响是否与遮荫下完全发育的叶片不同，对这两种类型的叶片进行了评估。遮荫甘蔗植株的co2同化效率低于光照充足的植株。根据荧光测量，这种减少似乎与更减少的qaredox状态相一致，这可能表明光依赖性反应下游的代谢限制。所有基因型的结果都是相似的，并且无论叶片是在遮荫条件下发育还是在充分日照条件下发育并随后暴露于遮荫条件下，都观察到这一结果，这表明光是影响光合效率的主要因素。这项研究强化了这样一种观点，即阴影的负面影响可能反映了NADP-ME c4grass的共同瓶颈。
Plants with C4metabolism normally have higher photosynthetic rates than C3ones. As a result, several of the most productive species known are NADP-ME C4grasses, such as sugarcane and maize. However, the advantages of the C4cycle are most evident under high light as the CO2concentrating mechanism comes at the expense of additional ATP. Recent works have suggested a negative impact of shading across NADP-ME C4grasses, causing a downregulation of maximal quantum efficiency of CO2assimilation (ϕCO2,max). The mechanisms behind the loss in photosynthetic efficiency and whether these results apply for other C4crops species and within germplasm of a species remain unclear. We analysed the photosynthetic acclimation to shade in four sugarcane genotypes with contrasting yield. To find out whether the effects of leaf history, i.e., shading a leaf developed under full sunlight and exposed later on to shade differ from a leaf fully developed under shading, these two types of leaves were evaluated. Shaded sugarcane plants showed decreased CO2assimilation efficiency compared to plants grown under full sunlight. Based on the fluorescence measurements, it seems that this reduction coincided with a more reducedQAredox state, which could point to a metabolic limitation downstream of the light-dependent reactions. The results were similar for all genotypes and were observed regardless of whether leaves developed under shade or under full sunlight conditions and exposed subsequently to shade, suggesting that light is the main factor affecting photosynthetic efficiency. This study reinforces the notion that this negative impact of shade could reflect a common bottleneck across NADP-ME C4grasses.
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2,6-二磷酸果糖控制光合蔗糖合成
影响因子：
4.3
作者：
M. Stitt;H. Heldt
通讯作者：
H. Heldt
DOI：
10.1071/pp9900579
发表时间：
1990-01-01
期刊：
AUSTRALIAN JOURNAL OF PLANT PHYSIOLOGY
影响因子：
--
作者：
KRALL, JP;EDWARDS, GE
通讯作者：
EDWARDS, GE
1982 年 IAC 系列赛车最终克隆赛，在普雷图里贝朗地区拉托索洛罗克索
DOI：
--
发表时间：
1999
期刊：
影响因子：
--
作者：
M. Landell;R. Alvarez;Léo Zimback;M. Campana;Marcelo de Almeida Silva;J. Pereira;D. Perecin;P. Gallo;A. Martins;R. Kanthack;P. Figueiredo;Antonio Carlos Machado Vasconcelos
通讯作者：
Antonio Carlos Machado Vasconcelos
影响因子：
6.9
作者：
Skillman, John B.
通讯作者：
Skillman, John B.
在高光下发育的 C4 玉米叶片对低光的结构和光合作用重新适应。
影响因子：
4.2
作者：
T. Yabiku;O. Ueno
通讯作者：
O. Ueno