Investigation formaize inbred lines resistance to Maize Rough Dwarf Virus (MRDV)
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J. Crop Sci. Biotech. 2016 (March) 19 (1) : 45 ~ 52 DOI No. 10.1007/s12892-015-0058-0 RESEARCH ARTICLE
Investigation for Maize Inbred Lines Resistance to Maize Rough Dwarf Virus(MRDV) Afshar Estakhr1,3, Bahram Heidari1*, Ali Dadkhodaie1, Mahmood Masoumi2,3, Hassan Pakniyat1, Zahra Ahmadi1 Department of Crop Production and Plant Breeding, College of Agriculture, Shiraz University, Shiraz, Iran Plant Virology Research Center, Shiraz University,Shiraz, Iran 3 Research Center for Agriculture and Natural Resources of Fars Province, Shiraz, Iran 1
2
Received: June 4, 2015 / Revised: September 8, 2015 /Accepted: November 23, 2015 Ⓒ Korean Society of Crop Science and Springer 2016
Abstract Maize rough dwarf virus (MRDV) is the most important disease affecting maize growth in Iran. In the present study, the putative resistance capacity of 35 maize inbred lines against the causal agents of MRDVwas studied under natural field infection in 2010 and 2011. The viral transmitter was a plant hopper known as Laodelphax steriatellus. Early sowing provided suitable temperatures for vector propagation and transmission and therefore natural infection under field conditions. Sowing single rows of SC704 as vector spreader between every five rows of inbred lines caused adequate vector propagation and viral transmission. This shows that viral infection was sufficient and possible resistance was linked to viral resistance, not failure, in vector transmission. In principal component biplot, plant height vector had wide angles with the vectors for disease severity index and MRDV incidence that showed the negative association of plant height with MRDV disease. The percentage of natural infection to MRDV in susceptible control(SC704) was about 64%. The genotypes A679, K3547/3, K3545/6, K3653/2, and B84 were more susceptible to MRDV. Only the line K3640/3 had low disease incidence and severity and it can be considered as resistant for possible use in genetic studies. Results showed that an early sowing of maize in temperate regions increases the chance of transmitting viruses via their vector. Key words : disease resistance, maize lines, MRDV, planthopper, viral disease,
Introduction Maize (Zea maysL.) is natural host for more than 30 viruses (Lapierreand Signoret 2004). However, a limited number of viral agents such as rhabdoviridae and reoviridae members seriously affect kernel yield globally (Ali and Yan 2012; Gordon et al. 1981; Gordon and Thottappilly 2003; LapierreandSignoret 2004; Redinbaughet al. 2004; Redinbaugh and Pratt 2009). Maize rough dwarf virus (MRDV) is of the most wide spread causal agent threatening maize cultivation in thetemperate regions of Iran.However, global climate change and favorable temperatures for the planthopper vector (Laodelphax steriatellus)have exacerbated the problem. MRDV was first detected in Italy in 1949, and later spread to other European countries (Dovas et al. 2004; Harpazet al. Bahram Heidari (
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