2021
DOI: 10.3389/fpls.2021.753011
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Physiological and Proteomic Responses of Contrasting Alfalfa (Medicago sativa L.) Varieties to High Temperature Stress

Abstract: High temperature (HT) is an important factor for limiting global plant distribution and agricultural production. As the global temperature continues to rise, it is essential to clarify the physiological and molecular mechanisms of alfalfa responding the high temperature, which will contribute to the improvement of heat resistance in leguminous crops. In this study, the physiological and proteomic responses of two alfalfa (Medicago sativa L.) varieties contrasting in heat tolerance, MS30 (heat-tolerant) and MS3… Show more

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Cited by 12 publications
(6 citation statements)
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“…Fv/Fm and Fv/Fo, on the other hand, reflect the maximum photochemical efficiency of PSII, representing the efficiency of the primary conversion of light energy in PSII and providing information on plants’ potential maximum photosynthetic capacity. Y(NO) reflects the extent of light damage, with a higher Y(NO) indicating incomplete absorption and conversion of light energy [ 54 , 55 ].…”
Section: Discussionmentioning
confidence: 99%
“…Fv/Fm and Fv/Fo, on the other hand, reflect the maximum photochemical efficiency of PSII, representing the efficiency of the primary conversion of light energy in PSII and providing information on plants’ potential maximum photosynthetic capacity. Y(NO) reflects the extent of light damage, with a higher Y(NO) indicating incomplete absorption and conversion of light energy [ 54 , 55 ].…”
Section: Discussionmentioning
confidence: 99%
“…(3) Compatible solutes and osmoregulation: Research focusing on the accumulation of osmoregulatory substances in alfalfa under drought stress predominantly centers around organic osmoregulators such as proline, betaine, soluble protein (SP), and soluble sugar (SS) ( Slama, 2013 ; Yang et al., 2013 ). These substances tend to increase with the duration and intensity of the drought ( Yu et al., 2006 ; Li et al., 2007 ; Huo, 2010 ). Studies have indicated that drought-tolerant alfalfa cultivars accumulate higher levels of osmoregulatory substances compared to drought-sensitive varieties ( Kang et al., 2011 ).…”
Section: Discussionmentioning
confidence: 99%
“…(4) Antioxidant Defense: Alfalfa’s adaptability to drought stress is closely linked to its antioxidant capacity. The activities of antioxidant enzymes (such as SOD, POD, and CAT) are significantly enhanced under drought stress, contributing to the plant’s increased resistance to drought ( Han et al., 2005 ; Li et al., 2007 ; Huo, 2010 ; Quan et al., 2016 ). Studies have demonstrated that drought-resistant alfalfa cultivars exhibit lower electrolyte conductivity and MDA content under drought conditions, suggesting stronger resistance to oxidative stress ( Hartung et al., 2001 ; Boldaji et al., 2011 ).…”
Section: Discussionmentioning
confidence: 99%
“…This protein is similar to a photosystem II component that regulates the function of photosystem II, via the optimization of the manganese cluster during water photolysis, in A. thaliana and tobacco ( Heide et al., 2004 ). It is also presumed to protect the D1 reaction center against oxidative damage during drought and heat stress in different algal and plant models ( Yamamoto, 2001 ; Kim et al., 2015 ; Cevik et al., 2019 ; Li et al., 2021a ). The expression levels of these genes were normalized in relation to their expression in leaves of control plants, which was set to a value of 1.0.…”
Section: Methodsmentioning
confidence: 99%