TAILIEUCHUNG - Exogenous application of gibberellic acid counteracts the ILL effect of sodium chloride in mustard
The response of mustard (Brassica juncea (L.) Czern & Coss cv. Varuna) to presowing seed treatment with sodium chloride (NaCl) was investigated. The plants raised from treated seeds were sprayed with water or 10-6 M GA3 at the 30- day stage. The seeds imbibed in 1 or 10 mM of NaCl resulted in a decrease in dry mass, leaf chlorophyll content. | Turk J Biol 29 (2005) 233-236 © TÜB‹TAK Exogenous Application of Gibberellic Acid Counteracts the Ill Effect of Sodium Chloride in Mustard Shaheena AFROZ, Firoz MOHAMMAD, Shamsul HAYAT, Manzer H. SIDDIQUI Plant Physiology Section, Department of Botany, Aligarh Muslim University, Aligarh, 202002 - INDIA Received: Abstract: The response of mustard (Brassica juncea (L.) Czern & Coss cv. Varuna) to presowing seed treatment with sodium chloride (NaCl) was investigated. The plants raised from treated seeds were sprayed with water or 10-6 M GA3 at the 30- day stage. The seeds imbibed in 1 or 10 mM of NaCl resulted in a decrease in dry mass, leaf chlorophyll content, carbonic anhydrase activity (. ), nitrate reductase activity (. ) and net photosynthetic rate at the 60-day stage, and pod number and seed yield at harvest. However, spray application of GA3 neutralized the ill effect of soaking treatment in NaCl (1 or 10 mM). Key Words: Brassica juncea, carbonic anhydrase, chlorophyll, nitrate reductase, salinity, seed yield. Abbreviations: CA-carbonic anhydrase; DAS-days after sowing; DH- dry mass; NR-nitrate reductase; PN-net photosynthetic rate. Introduction Brassica juncea (Indian mustard or brown sarson) is an important oil yielding crop, accounting for approximately 80% of the total production of rape seed and mustard in India (1). India is second in the world with regard to the production of Brassicas. The susceptibility of different varieties to salinity, drought, diseases and pests is the major cause of their low productivity. Salinity affects at least 20% of the world’s arable land and more than 40% of irrigated land to various degrees (2). Salinity influences adversely several aspects of reproductive growth, including flowering, pollination, fruit development, yield and quality and seed production (3-6). It also inhibits the activity of many enzymes (710), photosynthesis (10,11), absorption of minerals (12) and respiration .
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