Effects of Potassium Deficiency on Chloroplast Ultrastructure and Chlorophyll Fluorescence in Inefficient and Efficient Genotypes of Rice
| Autor: | Ying Feng, Ejazul Islam, Xiaoe Yang, Yan-bo Jia |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Journal of Plant Nutrition. 31:2105-2118 |
| ISSN: | 1532-4087 0190-4167 |
| DOI: | 10.1080/01904160802459625 |
| Popis: | Potassium (K) plays important roles in leaf photosynthesis, and the K-efficient rice genotype (HA) could maintain a significantly higher net photosynthetic rate (Pn) and stomatal conductance (Gs) at low K (5 mg K L−1) than the K-inefficient genotype (TLHZ). As compared to K-inefficient genotype (TLHZ), the K-efficient genotype (HA) was found to be able to maintain higher PSII-available photochemical efficiency (Fv/Fm), electron transport rate of PSII (ETR), and photochemical quenching (qP), but a smaller value of the non-photochemical quenching (NPQ) when grown at low K. In addition, better preserved chloroplast ultrastructure was noted in HA than in TLHZ under K deficiency. These results indicate that the K-efficient genotype has greater ability to keep PS reaction center less damaged and maintain stronger photosynthetic ability with high resistance to photoinhibition under K deficiency. The high efficient photochemical capacity in K-efficient genotypes may be a key factor for high K efficiency ... |
| Databáze: | OpenAIRE |
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