Exogenous Application of Growth-Stimulating Substances Alleviated the Effects of Water-Deficit Stress on the Spring Camelina sativa

A field experiment aimed to evaluate the agronomic characteristics of the spring camellia plant in different soil moisture conditions (۱۰۰% FC or well-watered and ۵۰% FC or water-deficit stress) and foliar spraying with ascorbic acid (concentration of ۱۰ and ۲۰ mM) and salicylic acid (۰.۶ and ۱.۲ mM) in the semi-arid region of Maragheh in the northwest of Iran (۴۷°۵۳′ E, ۳۷°۹۳′ N; ۱۶۸۲ m above sea level). The results showed that water shortage stress caused a significant decrease in plant height (۱۳%), canopy width (۴۳%), seed yield (۲۲%), number of days to maturity (۱۳%), and number of siliques plan-۱ (۴۴%). However, external application of high concentrations of ascorbic acid and to some extent salicylic acid could improve vegetative growth in both irrigation conditions. The highest number of days to maturity (۱۲۸ days) was recorded with the application of ۱.۲ mM salicylic acid solution under well-watered conditions. Foliar application of ascorbic acid under water-deficit stress conditions improved the chlorophyll content by ۲۸% compared to the control (S۰: spraying with distilled water). Foliar spraying with ۱۰ mM ascorbic acid could increase the number of seeds silique-۱ under both water-deficit stress (۵۸%) and well-watered (۳۶%) conditions when compared with control. The highest seed yield was obtained with foliar spraying of ۲۰ mM ascorbic acid under well-watered conditions. This foliar treatment could improve the seed yield by ۱۳% under well-watered conditions and ۱۶% in water-deficit conditions compared to the control. Under water shortage conditions, high concentrations of ascorbic acid and to some extent, salicylic acid can alleviate the effects of drought stress. The results showed that the exogenous application of ۱۰ mM ascorbic acid was very efficient under well-watered conditions. However, spray of growth-stimulating substances was able to alleviate the destructive effects of drought stress to some extent.

کلیدواژه ها:

acid ascorbic ، acid salicylic ، foliar spray ، phenology ، Seed yield ، Soil moisture