Indaziflam is an alkylazine herbicide used for preemergence control of annual weeds in warm‐season turfgrass. Growth chamber studies were conducted to determine the effect of indaziflam rate on bermudagrass (Cynodon dactylon L. Pers.) shoot and root initiation as influenced by soil texture and organic matter (OM). Bermudagrass plants propagated from stolons were planted in five different growing media, including pure sand (100% sand), sand (92% sand, 6% clay) with or without OM (2%), and loamy sand (82% sand, 12% clay) with or without OM (2%). Indaziflam at rates of 48 or 16 g ha−1 followed by drenches of 2.5 cm of water were applied to the bermudagrass plants after maximal root length reached 30 cm. Bermudagrass growing in pure sand, regardless of indaziflam rate, showed the most injury, with root and shoot biomass reduced to <10 and <32%, respectively, compared with the nonherbicide‐treated control 38 d after treatment (DAT). Increase in clay content and addition of OM at 16 g ha−1 indaziflam significantly improved root biomass to ≥40% at 38 DAT. Despite inhibitions to root growth, aboveground tissues of plants growing in sand and loamy sand with OM showed minimal or no changes in turf color and coverage at 16 g ha−1 indaziflam. Results of this study indicate that small amounts of clay and OM in sandy soil aid in reducing bermudagrass phytotoxicity risk of 16 g ha−1 indaziflam.
Roughstalk bluegrass (Poa trivialis L.) (RBG) is more heat sensitive than creeping bentgrass (Agrostis stolonifera L.) (CBG), but the physiological basis for this difference is poorly understood. Our objective was to determine the impact of high temperature on growth, root viability, concentrations of total nonstructural carbohydrates, fructan, glucose, protein, and amino acid in shoots and roots of RBG and CBG. One CBG (‘L93’) and two RBG cultivars (‘Laser’ and ‘Pulsar’) were grown in growth chambers at 23, 28, or 33°C and harvested 0, 10, 14, 21, 28, or 35 d after introduction (DAI) to high temperatures. Growth and physiological responses of Laser and Pulsar RBG were similar; therefore, differences between species were analyzed using Pulsar to represent RBG. Creeping bentgrass maintained better turf quality than RBG at 33°C and produced 15 mg of clipping dry wt. d−1 compared to only 0.5 mg dry wt. d−1 for RBG at 33°C 35 DAI. Root viability of RBG was higher than that of CBG at 23 and 28°C, but the reverse was true at 33°C. Fructan concentrations in RBG roots increased as exposure lengths increased, unlike in CBG. At 33°C, shoot amino acid concentration of RBG increased 223% compared to only 64% in CBG relative to concentrations in tissue exposed to 23°C. Our study identified differences in growth and physiological responses of CBG and RBG to high temperature that improve our understanding of differences between these species when grown in the field.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.