Combinig ability for some agronomic characters in grain sorghum under saline conditions and biochemical genetic markers for salinity tolerant genotypes
Abstract: Twenty-four hybrids and their parents of grain sorghum were evaluated under normal and saline soil at Nubaria Agric. Res. Stat. in 2003 and 2004 growing seasons. The genetic analysis was conducted using line x tester analysis.

Significant differences were found among years, genotypes, salinity treatments, parents and their F1's for all studied traits. Analysis of variance of salinity sensitivity index (SI) exhibited significant differences among crosses, parents, crosses vs parents and for male and female effects indicating the important role of some heterotic effect in sorghum foe salinity tolerance. Regarding SI, the most salinity tolerant parents were (ICSR89025) m2 and (ICSR89015) m4 (0.74 and 0.65, respectively) among males and f3 (ICSA-37), f6 (ATX631) and f2 (ICSA14), (0.39, 0.60 and 0.61, respectively) among females. Based on both yield under saline conditions and SI, there were four promising hybrids viz H3 (ICSA-1 x ICSR89038), H7 (ICSA14 x ICSR89038), H14 (ICSA70 x ICSR89025), and H24 (ATX631 x ICSA90015), where SI were 0.44, 0.54, 0.09 and 0.48, respectively.

Estimates of general combining ability effect showed that (ICSA14, ICSA37, ICSR89025 and ICSA90015 were the best general combiners for yield and salinity tolerance and the hybrids H3, H7, H14 and H24, were the best regarding SCA effect for SI while H1 had significantly positive SCA effect for grain yield. Results indicated that both additive and non-additive gene effect were important to improve grain yield of sorghum grown under saline conditions.

The tolerant parents were distinguished with five common bands which were not found at the sensitive genotypes at MW 255.81, 188.62, 43.78 and 32.12 KDa, except the female f6 which lacked two bands at MW 255.81 and 188.62 KDa. Most of these common bands were present in the most tolerant hybrids. Generally, the electrophoretic patterns water soluble protein could be a useful tool for the identification and characterization of the tolerant grain sorghum genotypes for salt stress conditions.

Key words: Grain sorghum, Sorghum bicolor, Combining ability, Salinity tolerance, SDS protein electrophoresis
Publication year 2005
Pages 219-236
Availability location معهد بحوث المحاصيل الحقلية-مركز البحوث الزراعية -8ش الجامعه الجيزة
Availability number
Organization Name
City القاهرة
serial title المجلة المصرية لتربية النبات
Department Grain Sorghum Research
Author(s) from ARC
External authors (outside ARC)
    مصطفي فزاع أحمد قسم المحاصيل - كلية الزراعة - جامعة عين شمس
Publication Type Journal
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