DROUGHT ASSESSMENT OF AUXIN-BOOSTED BIOSOLIDS
The presence of biologically active substances such as plant hormones in certain biosolids may enhance plant stress resistance by providing hormones directly or by stimulating the activity of microbes that supply substrates and hormones. This study was conducted to investigate if auxin-boosted biosolids increase physiological fitness and drought stress resistance of Kentucky bluegrass (KBG; Poa pratensis L.) under greenhouse conditions. Calcined clay-filled containers were amended with auxin-boosted biosolids, non-treated biosolids, and indole butyric acid (IBA) at three rates. The control received inorganic N (202 kg ha−1) only. The KBG subjected to each treatment was grown under well-watered (80–90% field capacity (FC)) and drought stress (40–50% FC) conditions. Root and shoot growth, visual quality, visual estimates of leaf wilting, canopy photochemical efficiency (PEc), leaf proline, cytokinin, and antioxidant enzyme activities were measured. The grass treated with auxin-boosted biosolids or IBA had greater root mass under drought stress compared to either the control or non-dosed biosolids treatments. Auxin-boosted biosolids improved turfgrass quality and delayed leaf wilting. The KBG amended with auxin boosted biosolids or IBA had greater PEc, leaf proline content, cytokinin trans-zeatin riboside (t-ZR) content, and antioxidant superoxide dismutase (SOD) activity under drought stress conditions when compared to the control. These data suggest that auxin-boosted biosolids may enhance defense chemical responses during limited soil moisture conditions, improving drought resistance. The beneficial effects of auxin-boosted biosolids may be closely associated with their increased activity of hormones such as auxin.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Research Article
Publication date: 2007-01-01
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites