PJB-2021-584
IMPACT OF HIGH TEMPERATURE ON ALFALFA (MEDICAGO SATIVA.L.) GROWTH AND PHYSIOLOGICAL PROPERTIES
OMER IDRIS MUSA OLOM
Abstract
High temperature is the main abiotic stress affecting alfalfa production. This experiment evaluated the impact of high temperature on five alfalfa varieties biomass yield and physiological properties to recognize heat-tolerant and sensitive varieties. The plants were exposed at temperature 38/35â—¦C light/dark for five days. The parameters of biomass yield and physiological properties were measured and analyzed. The result showed that high-temperature stress affected significantly shoot fresh and dry weight, root fresh and dry weight, relative water content (RWC), and chlorophyll content (SPAD reading). High temperature significantly increased the activity of superoxide dismutase (SOD) and peroxidase (POD). Comprehensively, the value of the membership function was applied to assess the heat tolerance of each variety. Heat tolerance was found in varieties with high average membership function values of 0.69 (Huaiyang) and 0.68 (Sardi), while heat sensitivity was found in the WL525 variety (0.34). This investigation provides essential data to know the impact of high temperature on alfalfa growth and physiological properties.
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