Effects of Enhanced Ultraviolet-B (UV-B) Radiation and Antioxidative-type Plant Growth Regulators on Rice (Oryza sativa L.) Leaf Photosynthetic Rate, Photochemistry and Physiology
Year: 2013
Type: article
Abstract: Elevated UV-B radiation deleteriously affects rice yields. The impacts of plant growth regulator (PGRs; ?-tocopherol, glycine betaine [GB] and salicylic acid [SA]) applications on higher plants have been the subject of many studies. However, little or no work has been carried out on rice responses to ?-tocopherol, GB or SA under UV-B stress conditions. This study determined the effects of ?-tocopherol (2.3 kg ha-1), GB (2.0 kg ha-1) or SA (12.9 g ha-1) application on rice leaf photosynthetic rate (PN), photochemistry and physiology under ambient and elevated UV-B conditions. Elevated UV-B decreased PN (17%), quantum yield (8%), electron transport rate (9%), total chlorophyll concentration (8%), plant height (12%), number of leaves (17%), pollen viability (6%), phenolic concentration (46%) and yield (21%). The applications of Alpha-tocopherol, GB or SA increased yield by 23%, 18% and 29%, respectively, under elevated UV-B. Application of PGRs increased leaf phenolic content thus rendering protection against elevated UV-B.
Source: Journal of Agricultural Science
DOI: 10.5539/jas.v5n5p115
Authors: Abdul Razack Mohammed, Lee Tarpley
Institution: Texas A&M University
Language: English
Topic: Light effects on plants
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
OpenAlex ID: W1972595207