PJB-2025-93
Effects of Seedlings Advances in Physiology Performance and Enzymes Activities under Perspectives of Environmental Stress on Quinoa
Rongzhen Wang
Abstract
This study examined the impact of drought stress and temperatures on the growth and physiological mechanisms of quinoa. Results revealed that increasing drought stress gradually reduced the seedling height, fresh weight, and chlorophyll fluorescence parameters while enhancing the root elongation, soluble protein, soluble sugar, proline content, and malondialdehyde content. While the chlorophyll content, and activities of antioxidant enzymes (POD, SOD, and CAT) were first increased reaching a maximum at light drought and then decreased. Increasing the temperature from 10 to 15°C increased the fresh weight, chlorophyll fluorescence, chlorophyll content, and antioxidant enzyme activities and then decreased by further increasing the temperature. Root length, soluble protein, proline, and malondialdehyde content were highest at 25°C. The interactive effect of severe drought and 25°C caused a maximum reduction in plant height, fresh weight, chlorophyll fluorescence, and chlorophyll content, while malondialdehyde, proline, soluble protein, and soluble sugar content showed maximum increase. The activity of antioxidant enzymes increased first and then decreased with increasing temperature and drought stress, reaching maximum under low drought at 15°C. In summary, temperature and drought stress significantly affected the growth and physiological responses of quinoa seedlings. The valuable information for quinoa cultivation and management in drought-prone areas.
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