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首页> 外文期刊>Journal of Experimental Botany >Exploring nitrogen remobilization for seed filling using natural variation in Arabidopsis thaliana
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Exploring nitrogen remobilization for seed filling using natural variation in Arabidopsis thaliana

机译：探索利用自然变异在拟南芥中进行氮素转运以填充种子的方法

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摘要

Nineteen Arabidopsis accessions grown at low (LOW N) and high (HIGH N) nitrate supplies were labelled using 15N to trace nitrogen remobilization to the seeds. Effects of genotype and nutrition were examined. Nitrate availability affected biomass and yield, and highly modified the nitrogen concentration in the dry remains. Surprisingly, variations of one-seed dry weight (DW1S) and harvest index (HI) were poorly affected by nutrition. Nitrogen harvest index (NHI) was highly correlated with HI and showed that nitrogen use efficiency (NUE) was increased at LOW N. Nitrogen remobilization efficiency (NRE), as 15N partitioning in seeds (15NHI), was also higher at LOW N. The relative specific abundance (RSA) in seeds and whole plants indicated that the 14NO3 absorbed post-labelling was mainly allocated to the seeds (SEEDS) at LOW N, but to the dry remains (DR) at HIGH N. Nitrogen concentration (N%) in the DR was then 4-fold higher at HIGH N compared with LOW N, whilst N% in seeds was poorly modified. Although NHI and 15NHI were highly correlated to HI, significant variations in NUE and NRE were identified using normalization to HI. New insights provided in this report are helpful for the comprehension of NUE and NRE concepts in Arabidopsis as well as in crops and especially in Brassica napus.
机译：使用 15 N标记了在低（LOW N）和高（HIGH N）硝酸盐供应下生长的十九个拟南芥种质，以追踪氮素向种子的迁移。检查基因型和营养的影响。硝酸盐的可利用性影响了生物量和产量，并大大改变了干燥残留物中的氮浓度。令人惊讶的是，营养对单子干重（DW 1S ）和收获指数（HI）的变化影响很小。氮素收获指数（NHI）与HI高度相关，表明在LOW N下氮素利用效率（NUE）有所提高。氮素转运效率（NRE）是 15 N在种子中的分配（ 15 NHI）在LOW N时也较高。种子和整株植物的相对比丰度（RSA）表明， 14 NO 3 吸收后标记主要分配给低氮的种子（SEEDS），但分配给高氮的干燥残留物（DR）。然后，高氮的DR中的氮含量（N％）比低氮高4倍，而种子中的N％修饰不佳。尽管NHI和 15 NHI与HI高度相关，但通过对HI进行归一化可以确定NUE和NRE的显着差异。本报告提供的新见解有助于理解拟南芥以及作物特别是甘蓝型油菜中的NUE和NRE概念。

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