Abstract
Thirty six single cross hybrids with six commercial checks were evaluated for yield performance along with earliness, plant height and ear height. The mean performance for days to tasseling and days to silking were significantly different among the hybrids. Considering the yield, Kaberi 50 and Pioneer 3396 were found as the best and the second best check, respectively. None of the hybrids produced higher yield compared to the best check Kaberi 50. On the other hand, L1´T1, L3´T1, L5´T3, L6´T3, L10´T1 and L1´T3 produced higher yield compared to 2nd best check Pioneer 3396 whereas L5´T3 and L11´T3 were earlier than the checks. The seven lines involving these crosses were selected for next generation evaluation. Better performing crosses showed higher K+/Na+ and lower contents of O2•-, H2O2 and melondialdehyde (MDA) than the susceptible crosses suggesting their better stress tolerance ability and thus better performance in yield. Key words: Maize yield, saline sensitivity, K+/Na+, superoxide, H2O2, melondialdehyde.
Highlights
Salinity, a severe threat for crop growth and production, has been increasing due to global climate
L1 T1, L3 T1, L5 T3, L6 T3, L10 T1 and L1 T3 produced higher yield compared to 2nd best check Pioneer 3396 whereas L5 T3 and L11 T3 were earlier than the checks
The salinity started from 3.3 dSm-1 and at harvesting, the level was almost 10 dSm-1 (Figure 1)
Summary
A severe threat for crop growth and production, has been increasing due to global climate. Maize (Zea mays L.) is the 3rd most important cereal crop after rice and wheat and is grown under a wide spectrum of soil and climatic conditions. It is an important C4 plant from the poaceae family and considered to have wider adaptability to growing environment (Chinnusamy et al, 2005). In Bangladesh, maize is becoming an important crop due to its high market demands with comparatively lower production cost and high yield. It continues to expand rapidly at an average rate of 20% yearly. Some biochemical parameters like K+/Na+, ROS and MDA were examined as selection criteria
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