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Kesahvarznia, R., Shahbazi, M., Mohammadi, V., Hosseini Salekdeh, G., Ahmadi, A., Mohseni-Fard, E. (2014). The impact of barley root structure and physiological traits on drought response. , 45(4), 553-563. doi: 10.22059/ijfcs.2014.53565
Reza Kesahvarznia; Maryam Shahbazi; Valiolah Mohammadi; Ghasem Hosseini Salekdeh; Ali Ahmadi; Ehsan Mohseni-Fard. "The impact of barley root structure and physiological traits on drought response". , 45, 4, 2014, 553-563. doi: 10.22059/ijfcs.2014.53565
Kesahvarznia, R., Shahbazi, M., Mohammadi, V., Hosseini Salekdeh, G., Ahmadi, A., Mohseni-Fard, E. (2014). 'The impact of barley root structure and physiological traits on drought response', , 45(4), pp. 553-563. doi: 10.22059/ijfcs.2014.53565
Kesahvarznia, R., Shahbazi, M., Mohammadi, V., Hosseini Salekdeh, G., Ahmadi, A., Mohseni-Fard, E. The impact of barley root structure and physiological traits on drought response. , 2014; 45(4): 553-563. doi: 10.22059/ijfcs.2014.53565

The impact of barley root structure and physiological traits on drought response

علوم گیاهان زراعی ایران
Article 8, Volume 45, Issue 4, May 2015, Pages 553-563    PDF (505.21 K)
Document Type: Research Paper
DOI: 10.22059/ijfcs.2014.53565
Authors
Reza Kesahvarznia1; Maryam Shahbazi2; Valiolah Mohammadi* 3; Ghasem Hosseini Salekdeh4; Ali Ahmadi5; Ehsan Mohseni-Fard6
1Ph. D. Student, Genetics Engineering, University of Tehran
2Assistant Professor, Biotechnology Institute of Agricultural Educate
3Associate Professor , University College of Agriculture & Natural Resources, University of Tehran, Karaj
4Associate Professor, Biotechnology Institute of Agricultural Educate,
5Assistant Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj
6Ph. D. Student, Faculty of Agriculture, Ferdowsi University of Mashhad
Abstract
abstract
Drought is the most important factor limiting crop yield word wide. Osmotic adjustment (OA) and strong and deep root system result in increased cereal drought tolerance through increasing water uptake and water use efficiency. The impact of root structure and physiological traits on drought stress response was studied in three barley cultivars including Yousof (drought tolerant), Morocco (susceptible), and Fajr30 (semi-tolerant) and an Iranian accession of wild species, Hordeom spontaneum (tolerant). Seeds were planted in PVC pipes 100 cm depth and 10 cm diameter. Two moisture regimes applied including a normal irrigation at field capacity (control), and drought stress at 20% available water. Root characteristics and physiological traits were measured ar flowering stage. Drought stress reduced stomatal conductivity, RWC, Leaf water potential, osmotic potential, OA and increased leaf temperature. Minimum decline in Leaf water potential, osmotic potential and RWC was observed in tolerant varieties (Yousof and H. spontaneum). The tolerant and susceptible varieties showed the highest and the lowest OA. Drought stress led to reduced root dry weight and volume in all varieties, susceptible variety showing the highest decline. Root depth increased under stress in all tolerant and semi-tolerant cultivars, while decreased in the susceptible one. The results showed that tolerant varieties are varieties which could uptake more water by increasing root depth leading to higher OA and higher RWC. Higher RWC results in more transpiration and lower leaf temperature under stress condition.
Keywords
Drought stress; relative water content; Osmotic adjustment; root volume; Root depth
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