Relationships between the photochemical reflectance index (PRI) and chlorophyll fluorescence parameters and plant pigment indices at different leaf growth stages
Relationships between the photochemical reflectance index (PRI) and chlorophyll fluorescence parameters and plant pigment indices at different leaf growth stages
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DOI：
10.1007/s11120-012-9747-4
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发表时间：
2012-09-01
影响因子：
3.7
通讯作者：
Omasa, Kenji
中科院分区：
文献类型：
--
作者：
Rahimzadeh-Bajgiran, Parinaz;Munehiro, Masashi;Omasa, Kenji
本研究旨在评估光化学反射指数（PRI），以评估植物整个生命周期的光合性能。利用光合诱导曲线研究了不同光照强度下茄（Solanum melongena L.，简称茄子）短期（日）和长期（季节）的PRI、叶绿素荧光参数和叶片色素指数之间的关系。研究发现，单叶同一部位的PRI/非光化学猝灭（NPQ）与PRI/电子传递速率（ETR）在短期内具有良好的相关性，但这种关系在植物的整个生命周期中并不存在。总体而言，短期内NPQ或ETR变化引起的PRI变化小于叶片老化引起的PRI变化的20%。结果还表明，PRI与植物色素，特别是光谱反射率测量的叶绿素指数高度相关。此外，均匀光强下不同生命阶段光系统II （I broken vertical bar， PSII）稳态PRI/ETR和稳态PRI/光化学产量的关系表明，叶绿素含量比NPQ和叶黄素更能与总光合能力和稳态PRI相关联。校正后的PRI指数适应了这些色素效应，与NPQ和ETR的相关性优于PRI。建议进一步研究基于叶黄素以外的色素的PRI指数，并研究不同物种的PRI机制。
This study aimed to evaluate the photochemical reflectance index (PRI) for assessing plant photosynthetic performance throughout the plant life cycle. The relationships between PRI, chlorophyll fluorescence parameters, and leaf pigment indices in Solanum melongena L. (aubergine; eggplant) were studied using photosynthetic induction curves both in short-term (diurnal) and long-term (seasonal) periods under different light intensities. We found good correlations between PRI/non-photochemical quenching (NPQ) and PRI/electron transport rate (ETR) in the short term at the same site of a single leaf but these relationships did not hold throughout the life of the plant. In general, changes in PRI owing to NPQ or ETR variations in the short term were < 20 % of those that occurred with leaf aging. Results also showed that PRI was highly correlated to plant pigments, especially chlorophyll indices measured by spectral reflectance. Moreover, relationships of steady-state PRI/ETR and steady-state PRI/photochemical yield of photosystem II (I broken vertical bar(PSII)) measured at uniform light intensity at different life stages proved that overall photosynthesis capacity and steady-state PRI were better correlated through chlorophyll content than NPQ and xanthophylls. The calibrated PRI index accommodated these pigments effects and gave better correlation with NPQ and ETR than PRI. Further studies of PRI indices based on pigments other than xanthophylls, and studies on PRI mechanisms in different species are recommended.