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首页> 外文期刊>Journal of Experimental Botany >Storing carbon in leaf lipid sinks enhances perennial ryegrass carbon capture especially under high N and elevated CO2
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Storing carbon in leaf lipid sinks enhances perennial ryegrass carbon capture especially under high N and elevated CO2

机译：在叶片脂肪水槽中储存碳增强多年生黑麦草捕获，特别是在高N和升高的CO2下

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摘要

By modifying two genes involved in lipid biosynthesis and storage [cysteine oleosin (cys-OLE)/diacylglycerol O-acyltransferase (DGAT)], the accumulation of stable lipid droplets in perennial ryegrass (Lolium perenne) leaves was achieved. Growth, biomass allocation, leaf structure, gas exchange parameters, fatty acids, and water-soluble carbohydrates were quantified for a high-expressing cys-OLE/DGAT ryegrass transformant (HL) and a wild-type (WT) control grown under controlled conditions with 1-10 mM nitrogen (N) supply at ambient and elevated atmospheric CO2. A dramatic shift in leaf carbon (C) storage occurred in HL leaves, away from readily mobilizable carbohydrates and towards stable lipid droplets. HL exhibited an increased growth rate, mainly in non-photosynthetic organs, leading to a decreased leaf mass fraction. HL leaves, however, displayed an increased specific leaf area and photosynthetic rate per unit leaf area, delivering greater overall C capture and leaf growth at high N supply. HL also exhibited a greater photosynthesis response to elevated atmospheric CO2. We speculate that by behaving as uniquely stable microsinks for C, cys-OLE-encapsulated lipid droplets can reduce feedback inhibition of photosynthesis and drive greater C capture. Manipulation of many genes and gene combinations has been used to increase non-seed lipid content. However, the cys-OLE/DGAT technology remains the only reported case that increases plant biomass. We contrast cys-OLE/DGAT with other lipid accumulation strategies and discuss the implications of introducing lipid sinks into non-seed organs for plant energy homeostasis and growth.
机译：通过改变涉及脂质生物合成和储存的两个基因和储存[半胱氨酸油蛋白（Cys-Ole）/二酰基甘油O-酰基转移酶（DGAT）]，实现了常年黑麦草（Lolium Perenne）叶中的稳定脂液滴的积累。为高表达的Cys-OLE / DGAT Ryegrass（HL）量化生长，生物质分配，叶片结构，燃气交换参数，脂肪酸和水溶性碳水化合物和在受控条件下生长的野生型（WT）控制在环境温度和升高的大气二氧化碳中供应1-10mm氮气（n）。 HL叶片发生叶碳（C）储存的剧烈移位，远离易可变的碳水化合物和朝向稳定的脂液滴。 HL主要在非光合器官中表现出增长率增加，导致叶片质量分数下降。然而，HL叶片显示了每单位叶面积的特定叶面积和光合速率，在高N供应下提供更大的整体C捕获和叶片生长。 HL还表现出升高的大气二氧化碳的光合作用反应。我们推测，通过表现为C的唯一稳定的微内膜，Cys-OLE封装的脂液滴可以减少光合作用的反馈并驱动C捕获。已经使用许多基因和基因组合的操纵来增加非种子脂质含量。然而，Cys-OLE / DGAT技术仍然是增加植物生物质的唯一报告的案例。我们将Cys-Ole / DGAT与其他脂质积累策略进行了凝固，并讨论将脂质水槽引入植物能量稳态和生长的非种子器官的含义。

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