|Table of Contents|

Effect of Low Potassium Stress on Photosynthetic and Chlorophyll Fluorescence Parameters of Two Soybean Varieties with Different K-efficiency(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2008年03期
Page:
451-455
Research Field:
Publishing date:

Info

Title:
Effect of Low Potassium Stress on Photosynthetic and Chlorophyll Fluorescence Parameters of Two Soybean Varieties with Different K-efficiency
Author(s):
WANG Wei; LI Xing-tao; QI Zuo-ying; QU Ting-ting; CAO Min-jian
Agronomy Department of Shenyang Agricultural University，Shenyang 110161，Liaoning，China
Keywords:
Low potassium stress; K-efficiency; Soybean; Photosynthesis; Chlorophyll fluorescence parameters
PACS:
S565.1
DOI:
10.11861/j.issn.1000-9841.2008.03.0451
Abstract:
In former thesis，difference of photosynthetic ability due to low K stress between two kinds of K-efficiency varieties had been reported in soybean，but the internal change and factors led to this difference hadn’t been found.So in this experiment，we selected two soybean varieties with different K-efficiency as material，in order to study the effect of low potassium on chlorophyll(Chl) contents，photosynthesis characteristics and chlorophyll fluorescence parameters，so as to probing into tolerant mechanism of different K-efficient varieties on low potassium stress.The plants were grown in modified 1/2 Hoagland’s solution with two different levels of K(K0.5and K3.0).Results showed there was no difference in Chl contents(a，b and a+b) between low potassium stress and CK for K-efficient variety，but the ratio of Chl a/b increased significantly.For K-inefficient variety，the content of Chl a and(a+b) greatly decreased in low potassium stress，and there were no change in content of Chl b and ratio of Chl a/b.Photosynthetic rate(Pn) of K-efficient variety in low potassium level was similar to that of CK，but the CO2concentration(Ci) in the cell and stomatal conductance(Gs) in low K level were much lower than that of CK.For K-inefficient variety，the decreases of Pn，Ciand Gswere all significant.The differences of F0，Fm，Fv/Fmand Fv/F0between two K levels weren’t significant for K-efficient variety，while the changes of these parameters were significant difference for K-inefficient variety，including the change of Fv.Except for that，the ratio of energy dissipated by reaction center increased in low K stress for GD8521，and the ratio of transfer energy decreased at the same time，while those change of Jiunong 15 were tiny.So we can concluded that a relatively high content of Chl a，b and(a+b)，especially the increase of Chl a content，resulted in a high ability of photosynthesis，the effective transfer of photosynthetic electron was another factor in maintaining the ability，while the significant changes of those parameters led to decrease of photosynthesis ability for K-inefficiency variety.

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Last Update: 2014-10-08