Growth under Fluctuating Light Reveals Large Trait Variation in a Panel of Arabidopsis Accessions
Growth under Fluctuating Light Reveals Large Trait Variation in a Panel of Arabidopsis Accessions
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DOI：
10.3390/plants9030316
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发表时间：
2020-03-01
期刊：
影响因子：
4.5
通讯作者：
Armbruster, Ute
中科院分区：
文献类型：
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作者：
Kaiser, Elias;Walther, Dirk;Armbruster, Ute
光自养生物固定碳的能力取决于光合作用将光能转化为化学势的效率。在自然界中，输入光合作用的光可以非常迅速和戏剧性地变化。为了分析在动态光照条件下拟南芥的遗传变异对光合作用和生长的影响，随机选择36个自然材料在均匀和波动的光强下生长。在均匀光和波动光下生长14d后，测定了最大光系统II量子效率(F-v/F-m)、弱光下光系统II工作效率(Phi(PSII))和非光化学猝灭(NPQ)，并估计了投影叶面积(PLA)和可见叶片数。结果表明，与均匀光照相比，多数材料在均匀光下生长时，PHi(PSII)和PLa降低，NPQ增加，而F-v/F-m和可见叶片数未受影响。这些参数大部分在不同材料间存在较大的变异，但与基因组变异无关。在均匀光下，速生材料在波动光下表现出最大的生长减慢，这与phi(PSII)的降低有很强的相关性，表明在波动光下，光合作用控制生长，反之亦然。
The capacity of photoautotrophs to fix carbon depends on the efficiency of the conversion of light energy into chemical potential by photosynthesis. In nature, light input into photosynthesis can change very rapidly and dramatically. To analyze how genetic variation in Arabidopsis thaliana affects photosynthesis and growth under dynamic light conditions, 36 randomly chosen natural accessions were grown under uniform and fluctuating light intensities. After 14 days of growth under uniform or fluctuating light regimes, maximum photosystem II quantum efficiency (F-v/F-m) was determined, photosystem II operating efficiency (phi(PSII)) and non-photochemical quenching (NPQ) were measured in low light, and projected leaf area (PLA) as well as the number of visible leaves were estimated. Our data show that phi(PSII) and PLA were decreased and NPQ was increased, while F-v/F-m and number of visible leaves were unaffected, in most accessions grown under fluctuating compared to uniform light. There were large changes between accessions for most of these parameters, which, however, were not correlated with genomic variation. Fast growing accessions under uniform light showed the largest growth reductions under fluctuating light, which correlated strongly with a reduction in phi(PSII), suggesting that, under fluctuating light, photosynthesis controls growth and not vice versa.