PJB-2024-203
Effect of drought stress on enzymatıc activity and path analysis of yield and related traits in sunflower (Helianthus annuus L.)
Ferzat TURAN
Abstract
Drought is one of the most important factors limiting the growth and reduction of crop production in most parts of the world. To investigate the effect of water shortage stress on different growth periods as well as some morphological traits on two sunflower cultivars, an experiment was conducted in the split-plot randomized completely block design in three replication and during the two crop years of 2018-2019. Four water stress in the plant's growth phase (control, head formation, flowering, and grain filling period) were considered the main plot and two hybrid sunflowers cultivars were considered the subplot. Among the studied traits, the traits of 1000 seed weight, grains per head, and the number of feathers seeds showed a very high correlation with seed yield. Also, in regression and path analysis under stress conditions, these traits were included in the model and had the highest coefficients and direct effects on seed yield. In the factor analysis, more than 70% of the changes in the data including seed yield traits, head diameter, 1000 seed weight, grains per head, and the number of feathers seeds in normal irrigation and water stress conditions were in the first factor. Additionally, drought stress during the flowering period increased the activities of CAT, SOD, and POD enzymes. According to the results obtained from the present research, the periods of flowering and seed filling are respectively the most sensitive stages to water stress, and the lack of water leads to a decrease in seed yield.
To Cite this article:
Download
