Phosphate Deficiency Modifies Lipid Composition and Seed Oil Production in Camelina.
Phosphate Deficiency Modifies Lipid Composition and Seed Oil Production in Camelina.
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DOI：
10.1016/j.plantsci.2023.111636
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Jianwu Li;Yuan Su;C. Shapiro;D. Schachtman;Xuemin Wang
中科院分区：
文献类型：
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作者：
Jianwu Li;Yuan Su;C. Shapiro;D. Schachtman;Xuemin Wang
亚麻荠（Camelina sativa）是一种新兴的工业油料作物，因为其具有两熟、休耕年生产、在边际土地上生长以及多种用途的种子油和膳食的潜力。为了实现亚麻荠的可持续生产的潜力，需要更好地理解亚麻荠籽油生产和组成如何响应于低投入环境。磷（P）是植物可利用的最少的必需常量营养素之一，在全球范围内供应有限。本研究探讨了亚麻荠种子油生产和脂质组成的田间设置和温室条件下，响应缺磷。脂质组学分析表明，在现场设置的P缺乏引发广泛的叶脂质重塑，降低磷脂的比例，非含P的半乳糖脂从30%至5%的P足够的条件下缺乏。缺磷增加种子含油量每种子重量约25%和20%，分别在田间和温室设置。此外，缺磷改变了种子脂肪酸组成，单不饱和脂肪酸18：1和20：1增加，多不饱和脂肪酸18：3减少。总种子产量下降了10至15倍，磷缺乏和减少导致种子数量减少，而不影响种子重量。田间和温室试验结果表明，缺磷使亚麻籽油含量增加，脂肪酸组成发生变化，种子产量显著下降，表明亚麻籽油高产优质与土壤磷素状况呈正相关。
Camelina (Camelina sativa) is an emerging industrial oilseed crop because of its potential for double cropping, fallow year production, growth on marginal lands, and multiple uses of seed oils and meals. To realize the potential for sustainable production of camelina, a better understanding of how camelina seed oil production and composition respond to low input environments is desired. Phosphorus (P) is one of the least available essential macronutrients to plants with finite worldwide supply. This study investigated seed oil production and lipid composition of camelina in field settings and under greenhouse conditions in response to P deficiency. Lipidomic profiling reveals that P deficiency in field settings triggered extensive leaf lipid remodeling that decreased the ratio of phospholipids to non-P-containing galactolipids from 30% to 5% under P sufficient to deficient conditions. P deficiency increased seed oil content per seed weight by approximately 25% and 20% in field and greenhouse settings, respectively. In addition, P deficiency altered seed fatty acid composition, with increases in monounsaturated 18:1 and 20:1 and decreases in polyunsaturated 18:3. Total seed production was decreased by 10- to 15-fold under P deficiency and the decrease resulted from reduced seed numbers without affecting seed weight. The results from field and greenhouse conditions indicate that P deficiency increases seed oil content, alters fatty acid composition, and decreases greatly seed production, suggesting that achieving a high yield and quality of camelina seed oil is positively linked to P status of soil.