title: Effect of 28-homobrassinolide on the performance of sensitive and resistant varieties ofVigna radiata.
abstract: A study was undertaken to examine the morpho-physiological alterations under different concentrations of 28-homobrassinolide (HBL) in two contrasting varieties ofVigna radiata. Sterilized seeds ofV. radiata(T-44 and PDM-139) were inoculated with specific Rhizobium and allowed to grow and then 14 day old seedlings were exposed to different concentrations (0, 10-10, 10-8, or 10-6M) of HBL and allowed to grow under natural environmental conditions. At the 15 and 21 day stage, plants were harvested to evaluate various parameters. Results clearly indicated that growth bio-markers, accumulation of proline and activities of various antioxidant enzymes increased significantly in T-44 at a later stage of growth in the presence of HBL whereas, 10-8M showed the most promising response. It is concluded that HBL modifies the physiological functions and biochemical metabolism ofV. radiataby increasing photosynthetic efficiency at an early stage of growth and antioxidant system in T-44 at a later stage of plant growth that are manifested in growth at later stages. It is believed that increased accumulation of proline and enhanced antioxidant system provide strength to the plants to withstand environmental cues.
authors.affiliation: Department of Botany & Microbiology, College of Sciences, King Saud University, Riyadh, Saudia Arabia.
authors.forename: Mohammed Nasser
authors.initials: MN
authors.lastname: Alyemeni
authors.affiliation: Department of Botany & Microbiology, College of Sciences, King Saud University, Riyadh, Saudia Arabia.
authors.forename: Sarah Mohammed
authors.initials: SM
authors.lastname: Al-Quwaiz
keywords: Antioxidant system; Chlorophyll; Morpho-physiological response; Photosynthetic efficiency; Proline