Effect of salicylic acid and progesterone on physiological characteristics of Kentucky bluegrass under salinity stress

Abstract

Salinity is one of the most important limiting factors in plant growth. It is also a predominant constraint that impairs grass growth and quality. Plant hormones play important roles in the capability of plants to adapt to environmental stresses. Hence, the impact of two plant growth regulators (PGRs) i.e. salicylic acid (SA) and progesterone (P4) was studied on biological characteristics of Poa pratensis in saline conditions in a greenhouse experimnt. The experimental treatments were composed of salinity at four levels (0, 2, 4, and 6 dS m-1) and six levels of PGRs (control, 1 mg L-1 P4,10 mg L-1 P4, 1 mM SA, 3 mM SA, and 1 mg L-1 P4 + 1 mM SA). The results showed that leaf firing percentage was increased with the excess in salinity, but the use of SA and P4 eased the effects of salinity stress and reduced leaf firing under salinity. 6 dS m-1 and 3 mM SA salinity caused to the maximum electrolyte leakage. The highest relative water content was observed in 4 dS m-1 salinity and 1 mM SA treatment. The highest glycine betaine was related to 6 dS m-1 NaCl and no hormone application. Salinity increased total protein and catalase, and the simultaneous use of P4 and SA exhibited the highest total protein and catalase content, whilst the control plants showed the lowest ones. The application of salinity stress reduced chlorophyll content, but SA and P4 increased it. The application of the two growth regulators improved carotenoid content under salinity stress. Overall, the results showed that the application of SA and P4 improved salinity tolerance and increased pigments and antioxidant enzyme activities.

Antioxidant response of Impatiens walleriana L. to drought

“…It can also be assumed that the impatiens during this period continues to defend itself against ROS by producing a high amount of enzymatic and non-enzymatic antioxidants (Kim et al, 2014). However, numerous studies reported a decline in the activity of antioxidant enzymes in various plants in the final stage of stress (three days or more after exposed plant to stress), indicating that antioxidant capacity and thus drought tolerance can vary among plants (Almeselmani et al, 2006;Sabzmeydani et al, 2021). It is evident that plant response to drought depends not only on the extremity and time duration of the stress but also on the plant genetic background.…”

The comprehensive application of the lawn ecology of the football field in enhancing the intention of sports consumption

“…A soccer field covering an area of about 7,500 square meters was selected as the research object, and the green grass species of the course was grassland early maturing grass [31], the soil was mainly brown soil and brown soil, the thickness is unknown, and the sprinkler irrigation conditions are good. According to the terrain and vegetation growth status, the sample collection area was in the area with a rich vegetation community, the lawn grass grew well, and the sunshine was sufficient.…”