From osmotic imbalance to germination arrest: key physiological nodes in the drought-alkaline interaction of alfalfa
Yunfei Zhang, Hongtao Hang, Xiaomei Wan, Guoling Guo, Chuanting Li
TL;DR
This study explores how different alfalfa varieties respond to drought and alkaline stress during germination, identifying key physiological traits that help some varieties tolerate these conditions better than others.
Contribution
The study identifies specific physiological mechanisms and differential responses of alfalfa varieties to combined drought and alkaline stress during germination.
Findings
Varieties like WL363HQ showed strong drought and salt tolerance, while WL319HQ was the weakest.
Drought-salt stress showed antagonism at low concentrations and synergism at high concentrations.
Tolerant varieties used mechanisms like SOD activity and soluble sugars to adapt to stress.
Abstract
Alfalfa (Medicago sativa L.) is often constrained by factors such as drought and salinity-alkalinity in cultivation. This study aims to investigate the differential response characteristics and physiological-ecological mechanisms of alfalfa during the germination stage under drought, bicarbonate, and drought-salt combined stress. Drought stress was simulated using PEG-6000 (0–20%), and salinity-alkalinity stress was simulated using NaHCO3 (0–30 mM) to conduct germination tests on 12 alfalfa varieties. Based on the semi-inhibitory concentrations of germination and phenotypic indicators of the 12 alfalfa varieties under either drought or bicarbonate stress, drought-salt combined stress was applied. A membership function method was used to comprehensively evaluate the differential responses of the 12 alfalfa varieties to drought and salinity during germination, as well as the…
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Taxonomy
TopicsPlant Stress Responses and Tolerance · Seed Germination and Physiology · Plant responses to water stress