Volume 7, Issue 28 (vol. 7, no. 28 2019)                   j.plant proc. func. 2019, 7(28): 35-44 | Back to browse issues page

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Pureisa M, Nabipur M, Meskarbashi M. Activities of fructan- metabolizing enzymes in barley stems subjected to terminal drought stress. j.plant proc. func.. 2019; 7 (28) :35-44
URL: http://jispp.iut.ac.ir/article-1-1067-en.html
1- Department of Agriculture, Payame Noor University , m_pureisa@pnu.ac.ir
2- Agronomy and plant breeding department, Shahid Chamran University, Ahvaz, Iran
Abstract:   (2142 Views)
Barley crop grown in semiarid areas may experience water deficit especially during grain filling that makes them more dependent on stem water-soluble carbohydrates (WSC). Fructans are the most important reserved carbohydrates. A pot experiment was undertaken at Shahid Chamran university in the duration of 2010-2011 growing seasons to investigate the accumulation and loss of WSC and the activity of fructan-metabolizing enzymes under water stress in four barley (Hordeum vulgare L.) cultivars namely Nimruz, Jonub, Nosrat and Torkaman. Cultivars were different in WSC-related traits such as WSC concentration (WSCc) at anthesis, maximum WSCc and rate of WSC accumulation in ten-day period after anthesis. Water withholding elevated WSC remobilisation efficiency. The activity of sucrose:sucrose 1-fructosyl transferase (1-SST; EC 2.4.1.99) harmonized the rate of WSCc increase in cultivars. The change in fructan 1-exohydrolase (1-FEH; EC 3.2.1.80) activity on the fifteenth day postanthesis was along with the change in stem reserve remobilisation. Considering acid invertase (EC 3.2.1.26) activity, a significant difference was observed between cultivars on the fifteenth day post anthesis under water-stressed conditions. Cultivars showed different manners in use of current photosynthesis and stem reserves that could be an important reason in different decreases in grain weight affected by water stress.
 
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Type of Study: Research | Subject: Drougth Stress
Received: 2018/05/28 | Accepted: 2018/10/3 | Published: 2019/03/9

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