Effect of 28-homobrassinolide on the performance of sensitive and resistant varieties of Vigna radiata

Abstract

A study was undertaken to examine the morpho-physiological alterations under different concentrations of 28-homobrassinolide (HBL) in two contrasting varieties of . Sterilized seeds of (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, or 10 M) 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 M showed the most promising response. It is concluded that HBL modifies the physiological functions and biochemical metabolism of by 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.

24-Epibrassinolide Improves Root Anatomy and Antioxidant Enzymes in Soybean Plants Subjected to Zinc Stress

“…Increases in P N and E are positively related to the improvements expressed in g s , and these effects are explained by the positive impact of EBR on the enzymatic activities of CA (Hayat et al 2011) and RuBisCO (Yu et al 2004), which are key enzymes in the initial process of photosynthesis. The high CA activity increases the carboxylation state of RuBisCO in the Calvin cycle, consequently decreasing C i and inducing P N maximization (Hasan et al 2011;Alyemeni and Al-Quwaiz 2016). The increase in WUE is associated with the benefits promoted by EBR on P N .…”

Exogenous Brassinolide Enhances the Growth and Cold Resistance of Maize (Zea mays L.) Seedlings under Chilling Stress

“…Huang [69] showed that chilling stress caused a decrease in the chlorophyll content and Pn of the herbaceous plant Dendrobium officinale, resulting in a decrease in maximum photochemical efficiency, which was significantly reduced by exogenous salicylic acid (SA) treatment. Chilling stress can significantly reduce maize Pn, and BLs can increase Pn under stress conditions, by increasing the chlorophyll content [70]; Fariduddin [59] used 28-homobrassinolide (HBL) to treat cucumber seedlings and found that the Pn, gs and Tr were significantly increased under low temperature and normal temperature conditions. This study showed that the application of exogenous BL at different concentrations could significantly alleviate the inhibitory effect of chilling stress on the Pn of maize seedlings, increase the gs and Tr, and significantly reduce the Ci.…”

The Protective Role of 28-Homobrassinolide and Glomus versiforme in Cucumber to Withstand Saline Stress

“…Brassinosteroids (BRs) are a class of phytohormones widely distributed in the plant kingdom that have a high potential for promoting growth and development [5][6][7][8][9]. To date, about 70 different forms of brassinosteroids have been isolated [9,10].…”

“…Brassinosteroids (BRs) are a class of phytohormones widely distributed in the plant kingdom that have a high potential for promoting growth and development [5][6][7][8][9]. To date, about 70 different forms of brassinosteroids have been isolated [9,10]. BRs have a critical role in root/stem growth, cell differentiation, cell elongation, gene modulation, development of flowers and fruits, etc., [6,7,9,10].…”

“…To date, about 70 different forms of brassinosteroids have been isolated [9,10]. BRs have a critical role in root/stem growth, cell differentiation, cell elongation, gene modulation, development of flowers and fruits, etc., [6,7,9,10]. Reports also show that BRs regulate seed germination, maturation, senescence, and abscission [11,12].…”