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Written Paper

Development of sugar beet drought tolerant varieties by using recurrent selection (diploid pollinators)  [2010]

Sadeghian, S.Y; Orazi zadeh, M.R; Ahamadi, M; Rajabi, A; et al.

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Limitation of water resources has affected crop production in semiarid regions in recent years. Although sugar beet is considered as a drought tolerant crop, water deficit stress at various growth stages results in reduced root yield of the crop. One of the most efficient methods for mitigating drought stress in sugar beet production is development and breeding of drought tolerant varieties. For doing this, breeding of drought tolerant pollinators was taken into account. Hence, ٤٥ half _sib families were derived from four pollinator populations named SBSI-DR-I, SBSI-DR-II, BP Karaj and ٤٣٦ Bigerm. After the evaluation of these families under drought stress, nine families were selected based on the highest root yield. These families were then used to develop ١٠٨ new half-sib families. Based on the results of the germination percentage in the lab (manitol test) and greenhouse (germination in clay soil), ٢٥ out of ١٠٨ half _sib families were selected as the male parents ٢٣١) as the female and ٢٥ hybrids were produced. * crossed with a common single cross (٤٣٦ The hybrids were then field evaluated under non-stress and stress conditions in Karaj and Mashad in ٢٠٠٧ and ٢٠٠٨. The average root yield of the genotypes in stress conditions in Mashad across two years indicated that the highest root yield, ٥٥.٧٨ t/ha, belongd to the ٢٣١)* SBSI-DR-I-HSF.١٤.P.٣٥. The mean root yield of the two foreign check * hybrid (٤٣٦ varieties, IR٧ and FD ٤١٥, under these conditions
was ٤٥.٠٣ and ٥٠.٠٦ t/ha, respectively. ٢,٥١٠,٣,١١,٩,١,٨ and ١٩ had higher yields , Also, the results indicated that the hybrids ٧,٦,١٤ compared with the two check varieties. Based on the highest root yield in stress conditions, ٢٣١)* SBSI-DR-I- * ٤٣٦ )] ٢٣١)* SBSI-DR-I-HSF.١٤.P.٣٥] and ٧ * ٤٣٦ )] the hybrids ١٢ HSF.١٤.P.٧] were superior to the check varieties and other hybrids and hence they can be recommended. The root yield of the genotypes averaged over two years and also stress ٢ and ١١ along with the , ١ , ٨ , ١٠ , ٧ , ٥ , ٣ , ٦ , ١٦ , tolerance index (STI) indicated the hybrids ١٢ check variety FD ٤١٥ were drought tolerant and classified in the same group. However, based on the STI, the check variety IR٧ was in another group producing less root yield and being less drought tolerant than the above mentioned hybrids. In the current research ٧٠ project, five hybrids derived from other research works were field evaluated for yield comparison across two years (٢٠٠٢ and ٢٠٠٣) under non-stress and stress conditions in Karaj and Mashad. The results indicated that the hybrid ( CMS A٣٧.١* I١٣) * BP MASHAD was superior to the other hybrids.