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RESEARCH ARTICLE
Contents Vol 51(1)

Effect of salt, alkali and combined stresses on root system architecture and ion profiling in a diverse panel of oat (Avena spp.)

Shahid Ahmed A , Richa Patel A , Maneet Rana A , Neeraj Kumar A , Indu I A , Mukesh Choudhary A , Subhash Chand A , Amit Kumar Singh https://orcid.org/0000-0002-2166-141X A , Avijit Ghosh A and Rajesh Kumar Singhal https://orcid.org/0000-0003-2685-6299 A *
+ Author Affiliations
- Author Affiliations

A ICAR-IGFRI (Indian Council of Agricultural Research-Indian Grassland and Forage Research Institute), Jhansi, Uttar Pradesh 284003, India.

* Correspondence to: rajasinghal151@gmail.com

Handling Editor: Muhammad Waseem

Functional Plant Biology 51, FP23031 https://doi.org/10.1071/FP23031
Submitted: 14 February 2023  Accepted: 4 September 2023  Published: 25 September 2023

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

The co-occurrence of salinisation and alkalisation is quite frequent in problematic soils and poses an immediate threat to food, feed and nutritional security. In the present study, root system architectural traits (RSAs) and ion profiling were evaluated in 21 genotypes of Avena species to understand the effect of salinity–alkalinity stress. The oat genotypes were grown on germination paper and 5-day-old seedlings were transferred to a hydroponic system for up to 30 days. These seedlings were subjected to seven treatments: T0, treatment control (Hoagland solution); T1, moderate salinity (50 mM); T2, high salinity (100 mM); T3, moderate alkalinity (15 mM); T4, high alkalinity (30 mM); T5, combined moderate salinity–alkalinity (50 mM + 15 mM);  and T6, combined high salinity–alkalinity (100 mM and 30 mM) by using NaCl + Na2SO4 (saline) and NaHCO3 + Na2CO3 (alkaline) salts equivalently. The root traits, such as total root area (TRA), total root length (TRL), total root diameter (TRD), total root volume (TRV), root tips (RT), root segments (RS), root fork (RF) and root biomass (RB) were found to be statistically significant (P < 0.01) among the different genotypes, treatments and their interactions. Na+ and K+ content analysis in root and shoot tissues revealed the ion homeostasis capacity of different Avena accessions under stress treatments. Principal component analysis (PCA) covered almost 83.0% of genetic variation and revealed that the sharing of TRA, RT, RS and RF traits was significantly high. Biplot analysis showed a highly significant correlation matrix (P < 0.01) between the pairs of RT and RS, TRL and RS, and RT and RF. Based on PCA ranking and relative value for stress tolerance, IG-20-1183, IG-20-894, IG-20-718 and IG-20-425 expressed tolerance to salinity (T2), IG-20-425 (alkalinity; T4) and IG-20-1183, IG-20-894 and IG-20-1004 were tolerant to salt–alkali treatment (T6). Multi-trait stability index (MTSI) analysis identified three stable oat genotypes (IG-20-714, IG-20-894 and IG-20-425) under multiple environments and these lines can be used in salinity–alkalinity affected areas after yield trials or as donor lines for combined stresses in future breeding programs.

Keywords: climate change, combined abiotic stresses, ion profiling, problematic soils, root anatomy, root-system architecture, salinity–alkalinity, stress tolerances.

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