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Agronomy 2018, 8(8), 155; https://doi.org/10.3390/agronomy8080155

Salinity and Low Phosphorus Differentially Affect Shoot and Root Traits in Two Wheat Cultivars with Contrasting Tolerance to Salt

1
Department of Environmental Sciences, COMSATS University Islamabad, Vehari-Campus, Vehari-61100, Pakistan
2
The UWA Institute of Agriculture, and School of Agriculture and Environment, The University of Western Australia, LB 5005, Perth WA 6001, Australia
3
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, and Chinese Academy of Sciences, Yangling 712100, Shaanxi, China
4
Department of Agricultural Sciences, University of Haripur, Khyber Pakhtunkhwa 22620, Pakistan
5
College of Agronomy, China Agricultural University, Beijing 100193, China
6
CSIRO Agriculture & Food, Private Bag No. 5, Wembley, WA 6913, Australia
*
Author to whom correspondence should be addressed.
Received: 9 July 2018 / Revised: 8 August 2018 / Accepted: 17 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Root-Soil Interactions)
Full-Text   |   PDF [2156 KB, uploaded 20 August 2018]   |  

Abstract

Soil salinity and phosphorus (P) deficiency both have adverse effects on crop growth and productivity, but the interaction of soil salinity and P deficiency is not well known. Two P-inefficient wheat cultivars, Janz (salinity-tolerant) and Jandaroi (salinity-sensitive), grown in soil in rhizoboxes, were treated with either 100 µM P (control), 100 mM NaCl (saline stress), 10 µM P (low P stress), or both NaCl and low P (combined stress), from 10 days after sowing (DAS) until harvest at 40 DAS. Significant reductions in leaf area, shoot and root biomass, tissue water and chlorophyll contents, gas exchange, and K+ and P acquisition at harvest were observed in the three treatments. The reduction was greater for low P supply than for salinity alone, but their interaction was not additive. The detrimental effects on root growth became apparent 10 days earlier in Jandaroi compared to Janz. Root length, root number, root length densities, and root number densities were higher in the upper 10 cm soil layer than in the lower layers for both cultivars. This study demonstrated that 10 µM P is more detrimental than 100 mM NaCl for shoot and root growth of both wheat cultivars irrespective of their difference in salinity tolerance. View Full-Text
Keywords: leaf gas exchange; P availability; root mapping; salt tolerance; root length density leaf gas exchange; P availability; root mapping; salt tolerance; root length density
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Abbas, G.; Chen, Y.; Khan, F.Y.; Feng, Y.; Palta, J.A.; Siddique, K.H.M. Salinity and Low Phosphorus Differentially Affect Shoot and Root Traits in Two Wheat Cultivars with Contrasting Tolerance to Salt. Agronomy 2018, 8, 155.

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