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Journal of Zhejiang University SCIENCE B 2008 Vol.9 No.5 P.427-434

http://doi.org/10.1631/jzus.B0710636


Differential response of root morphology to potassium deficient stress among rice genotypes varying in potassium efficiency


Author(s):  Yan-bo JIA, Xiao-e YANG, Ying FENG, Ghulam JILANI

Affiliation(s):  MOE Key Laboratory of Polluted Environments Remediation and Ecosystem Health, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   xyang@zju.edu.cn

Key Words:  Genotypic difference, Potassium (K) efficiency, Root surface area, Fine root development, Root cell utra-structure


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Yan-bo JIA, Xiao-e YANG, Ying FENG, Ghulam JILANI. Differential response of root morphology to potassium deficient stress among rice genotypes varying in potassium efficiency[J]. Journal of Zhejiang University Science B, 2008, 9(5): 427-434.

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author="Yan-bo JIA, Xiao-e YANG, Ying FENG, Ghulam JILANI",
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volume="9",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.B0710636"
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%T Differential response of root morphology to potassium deficient stress among rice genotypes varying in potassium efficiency
%A Yan-bo JIA
%A Xiao-e YANG
%A Ying FENG
%A Ghulam JILANI
%J Journal of Zhejiang University SCIENCE B
%V 9
%N 5
%P 427-434
%@ 1673-1581
%D 2008
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.B0710636

TY - JOUR
T1 - Differential response of root morphology to potassium deficient stress among rice genotypes varying in potassium efficiency
A1 - Yan-bo JIA
A1 - Xiao-e YANG
A1 - Ying FENG
A1 - Ghulam JILANI
J0 - Journal of Zhejiang University Science B
VL - 9
IS - 5
SP - 427
EP - 434
%@ 1673-1581
Y1 - 2008
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.B0710636


Abstract: 
Disparity in the root morphology of six rice (Oryza sativa L.) genotypes varying in potassium (K) efficiency was studied with three K levels: 5 mg/L (low), 10 mg/L (moderate) and 40 mg/L (adequate) in hydroponic culture. Morphological parameters included root length, surface area, volume and count of lateral roots, as well as fine (diameter<0.2 mm) and thick (diameter>0.2 mm) roots. The results indicate that the root growth of all genotypes was reduced under low K, but moderate K deficiency increased the root length of the efficient genotypes. At deficient and moderate K levels, all the efficient rice genotypes developed more fine roots (diameter<0.2 mm) than the inefficient ones. Both fine root count and root surface area were found to be the best parameters to portray K stress in rice. In accordance with the root morphology, higher K concentrations were noted in shoots of the efficient genotypes when grown at moderate and deficient K levels, indicating that root morphology parameters are involved in root uptake for K and in the translocation of K up to shoots. K deficiency affected not only the root morphology, but also the root ultra-structure. The roots of high-efficient genotypes had stronger tolerance to K deficient stress for root membrane damage, and could maintain the developed root architecture to adapt to the low K growth medium.

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