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Written Paper

Screening and Identification of Beet Drought Tolerant Diploid Multigerm Half-Sib Families in the Field  [2010]

Fathollah Taleghani, D; Rajabi, A; Yousefabady, V.A; Jalili, F;

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Water deficit is one of the important factors limiting crop productivity in arid and semiarid regions of the world. Therefore, introduction of drought tolerant varieties in agricultural crops including sugar beet is of special priority. One of three components of the hybrid varieties is suitable pollinator parent. In this study, ١٣١ half-sib families ١١٠ and ١١١) were compared, in , (selected from three fodder beet populations, ٧٢٢١ ( three separate experiments, with their respective original populations and a tolerant (IR٧ and a susceptible (١٩١) check in drought stress condition in a randomized complete block design with ٤ replications. Thirty out of ١٣١ half-sib families which had enough seeds were also evaluated under non-stress condition with the same above checks. The experiments were carried out at Kamalabad Research Station, Karaj, Iran in ٢٠٠٩. The irrigations were as usual in the both water treatments up to the plant establishment. ٩٠ - Afterwards, the irrigations of the non-stress and stress treatments were done after ٨٠ mm and ٢٠٠ mm evaporation from the class A evaporation pan, respectively. At harvest, the number of roots and roots weight of each plot were recorded and then the technological quality of the roots were determined at sugar technology lab of Sugar Beet Seed Institute (SBSI), Karaj. Results of statistical analysis indicated that among the ٤٧ ٩ families were superior to the tolerant ," families selected from the population "٧٢٢١ ch
eck among which the family no ٣٤ produced ٦١.٧ t/ha root yield, ١٣.٢% sugar content and ٥.٢ t/ha white sugar yield. Among the ٣٧ families selected from the population ١٢ families were superior to the tolerant check among which the family no ٥٢ had ," ١١١ " the highest (٦.٧ t/ha) white sugar yield. Among the ٤٧ families selected from the ٢٥ families were superior to the tolerant check among which the ," population "١١٠ family no ٥٢ produced ٥٥.٦ t/ha root yield, ١٢.٤% sugar content and ٤ t/ha white sugar yield. In general, all the families selected from the three original populations were inferior to the tolerant check in sugar content. However, they demonstrated a high potential for root yield. This indicates that sugar yield of these selected families could be significantly increased by selection for increased sugar content and the hybrids derived from these potential pollinator parents may be introduced to the water-limited areas such as Khorasan-Razavi province.