250
Views
32
CrossRef citations to date
0
Altmetric
Original Articles

Effects of Potassium Deficiency on Chloroplast Ultrastructure and Chlorophyll Fluorescence in Inefficient and Efficient Genotypes of Rice

, , &
Pages 2105-2118 | Received 13 Sep 2007, Accepted 15 Feb 2008, Published online: 14 Nov 2008
 

ABSTRACT

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 in rice.

ACKNOWLEDGMENTS

The study was financially supported by a Program for Changjiang Scholars and Innovative Research Team in University (# IRT0536), and the key International Cooperative Project from Science Ministry of China (#2006DFA31030). The authors are grateful to Prof. Junying Li from the Center of Analysis & Measurement of Zhejiang University for her kind help in the Transmission Electron Microscope analyses of the plant samples.

Log in via your institution

Log in to Taylor & Francis Online

PDF download + Online access

  • 48 hours access to article PDF & online version
  • Article PDF can be downloaded
  • Article PDF can be printed
USD 61.00 Add to cart

Issue Purchase

  • 30 days online access to complete issue
  • Article PDFs can be downloaded
  • Article PDFs can be printed
USD 495.00 Add to cart

* Local tax will be added as applicable

Related Research

People also read lists articles that other readers of this article have read.

Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine.

Cited by lists all citing articles based on Crossref citations.
Articles with the Crossref icon will open in a new tab.