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EFFECT OF PLANT GROWTH REGULATORS ON CREEPING BENTGRASS GROWTH AND HEALTH DURING HEAT, SALT, AND COMBINED HEAT AND SALT STRESS

Drake, Arly Marie
http://rave.ohiolink.edu/etdc/view?acc_num=osu1546450732510932

Abstract Details

2019, Doctor of Philosophy, Ohio State University, Horticulture and Crop Science.
Creeping bentgrass (Agrostis stolonifera L.) is a turfgrass species that is widely used on golf courses throughout the United States. It can withstand extremely low mowing heights and can provide a dense cover making it an ideal species for low cut areas of the golf course. However, at times it is subjected to environmental stresses such as heat and salt. In field settings plants are often subjected to more than one stress at a time and studying stresses independently is likely insufficient. These stresses can affect plant hormone levels and, in turn, plant hormone levels can affect how well the plant tolerates stress. There were two experiments conducted. In the first experiment creeping bentgrass was transplanted into hydroponics systems in two different growth chambers. One chamber was set to have day and night time temperatures of 35 and 30-degrees Celsius, respectively. The other was set to have a day and night time temperatures of 25 and 20-degrees, respectively. Within each chamber one block received a 50 mM sodium chloride (NaCl) treatment and the other did not. The stress treatments were applied for 14 days. The experiment was repeated four times. Results of the first experiment indicated that the treatments were sufficient to negatively affect creeping bentgrass growth and health as indicated by fresh shoot and root weights, tillering, electrolyte leakage and total chlorophyll content (TCC). There were significant interactions between temperature and salt level detected for shoot and root weights and electrolyte leakage. Plants that were exposed to both heat and salt stress were more negatively affected than plants exposed to either heat or salt stress alone for all metrics except for tillering. The presence of NaCl reduced tillering regardless of temperature regime. In the second experiment plants were treated the same, but plant growth regulator (PGR) treatments were also applied. The second experiment was repeated six times and PGR treatments were re-randomized within the block each time. The PGR treatments consisted of two different gibberellin (GA) synthesis-inhibitor products, 2,4-dichlorophenoxy acid (2,4-D), two different rates of aminoethoxyvinylglycine (AVG), an ethylene synthesis suppressor, and plants that were not treated with a PGR. In addition to the aforementioned measurements of plant health and growth dry shoot and root weights were also measured. There were two significant interactions detected in the second experiment. For TCC there was a two-way interaction between temperature and PGR treatment and for electrolyte leakage there was a three-way interaction between temperature, salt level and PGR treatment. Combined heat and salt stress negatively affected all plants regardless of PGR treatment, but there were differences between PGR treatments. Plants treated with AVG performed better than the other PGR treatments. These plants had the highest shoot and root masses. Plants treated with GA-synthesis inhibitors had the lowest shoot and root masses as well as the lowest TCC when subjected to stress.
David Gardner, PhD (Advisor)
Joshua Blakeslee, PhD (Committee Member)
Karl Danneberger, PhD (Committee Member)
Edward McCoy, PhD (Committee Member)
James Metzger, PhD (Committee Member)
96 p.
Agriculture; Agronomy
Turfgrass; Heat Stress; Salt Stress; Combined Stress; Plant Growth Regulators

Recommended Citations

Citations

  • Drake, A. M. (2019). EFFECT OF PLANT GROWTH REGULATORS ON CREEPING BENTGRASS GROWTH AND HEALTH DURING HEAT, SALT, AND COMBINED HEAT AND SALT STRESS [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546450732510932

    APA Style (7th edition)

  • Drake, Arly. EFFECT OF PLANT GROWTH REGULATORS ON CREEPING BENTGRASS GROWTH AND HEALTH DURING HEAT, SALT, AND COMBINED HEAT AND SALT STRESS. 2019. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1546450732510932.

    MLA Style (8th edition)

  • Drake, Arly. "EFFECT OF PLANT GROWTH REGULATORS ON CREEPING BENTGRASS GROWTH AND HEALTH DURING HEAT, SALT, AND COMBINED HEAT AND SALT STRESS." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546450732510932

    Chicago Manual of Style (17th edition)

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