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Response of Hybrid Vigor of Taichung 5 Subjected Differental-stresses
Crops growth and development are controlled mainly by genetic
and environmental factors. In agriculture production, hybrid varie-
ties are frequently used and developed for different environments.
However, whether the hybrid variety can tolerate unfavorable en-
vironments is a question. This experiment was designed to explore
the adaptability of hybrid sorghum, Taichung 5, and its parental
lines (80B and 2R) to unfavorable environments. The sorghum plants
were treated to various stresses at the seedling emergence and the
early vegetative stage in greenhouse, respectively. Another were
conducted at fall and spring crop season for studying on different
environment-adaptation of hybrid sogrhum, Taichung 5. The results
are summarized as foolowings:
1.The hybrid sorghum had no better hybrid vigor than its parental
lines under the heat shock, drought and salt stress at the
seedling emergence stage based on the measurements of emergence
percentage, plant height and plant dry weight. But the hybrid
sorghum had better adaptability than its parental lines under cold
shock and flooding at this stage based on measurement emergence
2.The hybrid sorghum could not adapt salt stress at the early ve-
getative stage. But it had better hybrid vigor than its parental
lines under shading and nutrient deficiency. This is based on me-
asurement plant height and plant dry weight.
3.The reproductive growth of hybrid sorghum did better during the
unfavorable crop season (spring crops)than its parental lines.
This is based on the yield and yield components data.
As a whole, the hybrid sorghum seemed haven''t better hybrid vigor
in the unfavorable environments than its parental lines at the seedling
emergence or early vegetative stage. However, it did better vigor than
its parent lines in the reproductive stage under two cropping seasons.
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