Interactions between nitrogen nutrition, canopy architecture and photosynthesis in rice, assessed using high-resolution 3D reconstruction
Interactions between nitrogen nutrition, canopy architecture and photosynthesis in rice, assessed using high-resolution 3D reconstruction
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DOI：
10.1093/insilicoplants/diaa017
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发表时间：
2020-12
期刊：
影响因子：
3.1
通讯作者：
A. Burgess;Tiara Herman;Asgar Ali;E. Murchie
中科院分区：
文献类型：
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作者：
A. Burgess;Tiara Herman;Asgar Ali;E. Murchie
提高氮素利用效率是产量提高计划的一个关键目标。在这里，我们确定了水稻冠层结构的特点，在改变氮的供应，并将其与光合生产力。采用经验数学建模、高分辨率三维重建和气体交换测量方法，研究了轻度氮素缺乏与过量氮素施用对整个生长过程中冠层结构、光照和光合作用分布的影响。三个对比水稻品系：两个马来西亚水稻品种（MR219和MR253）和一个高产籼稻品种（IR64）进行了栽培。3D重建表明关键的N依赖的植物结构和冠层光分布的差异，包括叶面积指数（LAI），分蘖数，叶角和模拟消光系数的变化。测得的叶片光合能力没有显着差异高和减少氮处理，然而，模拟冠层光合速率表明，减少氮处理，但更高的碳增益每单位地面面积的高氮处理单位叶面积。这是由于改变冠层结构，导致增加光分布下减少氮，部分抵消了减少叶面积指数。在水稻中，改变N的可用性的结果在充分的光合功能叶片的发展，但导致改变冠层结构，光分布和整体生产力表明，N的可用性可以微调，以优化生物量生产。我们建议更广泛地使用三维重建，以评估冠层结构和生产力下不同的N可用性的一系列物种。
Increasing nitrogen use efficiency is a key target for yield improvement programs. Here we identify features of rice canopy architecture during altered N availability and link them to photosynthetic productivity. Empirical mathematical modelling, high-resolution 3-dimensional (3D) reconstruction and gas exchange measurements were employed to investigate the effect of a mild N deficiency vs. surplus N application on canopy architecture, light and photosynthesis distribution throughout development. Three contrasting rice lines: two Malaysian rice varieties (MR219 and MR253) and a high-yielding indica cultivar (IR64) were cultivated. 3D reconstruction indicated key N-dependent differences in plant architecture and canopy light distribution including changes to leaf area index (LAI), tiller number, leaf angle and modelled light extinction coefficients. Measured leaf photosynthetic capacity did not differ substantially between the high and reduced N treatments; however, modelled canopy photosynthesis rate indicated a higher carbon gain per unit leaf area for the reduced N treatment but a higher carbon gain per unit ground area for the high N treatment. This is a result of altered canopy structure leading to increased light distribution under reduced N which partially offsets the reduced LAI. Within rice, altered N availability results in the development of full photosynthetically functional leaves, but leads to altered canopy architecture, light distribution and overall productivity suggested that N availability can be fine-tuned to optimize biomass production. We propose wider use of 3D reconstruction to assess canopy architecture and productivity under differing N availabilities for a range of species.