VCU test of new sugar beet rhizomania and beet cyst nematode resistant hybridsύ
2014
Mahmodi, B. | Mobser, S. | Ghaemi, A. | Bazrafshan, M. | Mehdikhani, P. | Kakoeenejad, M. | Abdollahian, M. | Soltani, J. | Mahzoni, J. | Bakhshandeh, M.H. | keshavarz, K. | Gharakhani, A.R.
In this research, yield and quality of three new hybrids SBSI031, SBSI032 and SBSI033 were compared with the resistant foreign checks in naturally-infected fields to rhizomania and beet cyst nematode. The comparison was carried out in an experiment with 9 treatments and four replications during the years 2012-2013. The experiment was conducted in three locations including Khoy (infected with beet cyst nematode), Mashhad and Shiraz (infected with rhizomania). Resistance to beet cyst nematode and rhizomania was also investigated in greenhouse condition. In the greenhouse condition, Pauletta (resistant foreign check) and SBSI032 had the lowest infection to rhizomania. Reaction of the cultivars to beet cyst nematode in the greenhouse condition showed that cultivar Sanetta (resistant foreign check) with mean of 3.77 cysts per plant was the most resistant one, then Pauletta and SBSI031 with 10.33 and 20.83 cysts per plant, respectively, were categorized in the other groups. Evaluation of resistance of the cultivars to beet cyst nematode in the field condition (Khoy) showed that reproductive factor of the nematode for Sanetta, Pauletta and SBSI032 was less than two, while it was more than sixfor susceptible check (Jolgaeh). Pauletta and SBSI031 had the lowest rhizomania severity (3) in the infected field condition (Mashhad and Shiraz), while the highest severity of rhizomania (6.25) belonged to Jolgaeh. The results of mean of sugar yield (across three locations and two years) showed that Pauletta and SBSI031 (with 9.79 and 9.13 t/ha, respectively) were categorized in the best group.
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