Comparative physiological and metabolic analyzes of two Italian ryegrass (Lolium multiflorum) cultivars with contrasting salinity tolerance
- 1 July 2021
- journal article
- research article
- Published by Wiley in Physiologia Plantarum
- Vol. 172 (3), 1688-1699
- https://doi.org/10.1111/ppl.13374
Abstract
Italian ryegrass (Lolium multiflorum) is a widely cultivated forage with high nutritional value and good palatability. Salinity, however, is a negative factor to lessen output and quality in Italian ryegrass. The aim of this study was to elucidate the salt tolerance mechanism of two Italian ryegrass cultivars, 'Abundant' and 'Angus'. Under hydroponic conditions, two cultivars of Italian ryegrass with different salt tolerance were exposed to 0 and 300 mM NaCl solution for 1 week, respectively. The results showed that salt stress decreased relative growth rate and relative water content, especially in salt-sensitive 'Angus'. The salt-tolerant 'Abundant' cultivar alleviated reactive oxygen species (ROS) induced burst and cell damage. However, 'Angus' exhibited a greater activity of superoxide dismutase (SOD) and peroxidase (POD) than 'Abundant'. Additionally, 'Abundant' exhibited higher photosynthetic efficiency than 'Angus' under salt stress condition. Salt treatment significantly increased the Na/K, Na/Mg, and Na/Ca ratios in the leaves and roots of both cultivars, with a pronounced effect in salt-sensitive 'Angus'. The metabolite analysis of leaf polar extracts revealed 41 salt responsive metabolites in both cultivars, mainly consisting of amino acids, organic acids, fatty acids, and sugars. Following exposure to salt conditions, salt-sensitive 'Angus' had a higher level of metabolites and more uniquely upregulated metabolites were detected. Based on these findings, we conclude that the 'Abundant' cultivar emerged as a favorite in saline-alkali soil, while the 'Angus' cultivar is suitable for planting in normal soil. It appears that the high salt tolerance of 'Abundant' is partly to prevent the plant from ionic homeostasis disruption.Funding Information
- Youth Innovation Promotion Association of the Chinese Academy of Sciences (2017389)
- National Natural Science Foundation of China (31672482)
This publication has 76 references indexed in Scilit:
- Alleviation of heat damage to photosystem II by nitric oxide in tall fescuePhotosynthesis Research, 2013
- Differential Responses of CO2 Assimilation, Carbohydrate Allocation and Gene Expression to NaCl Stress in Perennial Ryegrass with Different Salt TolerancePLOS ONE, 2013
- Sheep production, plant growth and nutritive value of a saltbush-based pasture system subject to rotational grazing or set stockingSmall Ruminant Research, 2010
- Arbuscular mycorrhizal fungi in alleviation of salt stress: a reviewAnnals of Botany, 2009
- Metabolic responses to salt stress of barley (Hordeum vulgare L.) cultivars, Sahara and Clipper, which differ in salinity toleranceJournal of Experimental Botany, 2009
- Mechanisms of Salinity ToleranceAnnual Review of Plant Biology, 2008
- A Reassessment of the Function of the So-Called Compatible Solutes in the Halophytic Plumbaginaceae Limonium latifoliumPlant Physiology, 2007
- Salt-tolerant reed plants contain lower Na+ and higher K+ than salt-sensitive reed plantsActa Physiologiae Plantarum, 2007
- Genes and salt tolerance: bringing them togetherNew Phytologist, 2005
- SALT AND DROUGHT STRESS SIGNAL TRANSDUCTION IN PLANTSAnnual Review of Plant Biology, 2002