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The effect of suboptimal temperature on antioxidation of primed bitter gourd seeds.
|關鍵字:||suboptimal temperature;次適溫;bitter gourd;antioxidation;苦瓜;抗氧化作用||出版社:||農藝學系||摘要:||
中 文 摘 要
Bitter gourd is a tropical crop accompanying with hard seed coat. It is generally lower in emergence percentage and longer in emergence time. In this study, seeds of two bitter gourd cultivars Special Six and Moon Shine were subjected to different presowing treatments (solid priming, warm water soaking and a combination of solid priming and warm water soaking). For evaluating the possible physiological traits related to emergence percentage of seeds, both treated and non-treated seeds were germinated under 25 ℃(normal temperature), 20 ℃(sub-optimal temperature) and 15 ℃(low temperature). The results indicated that sub-optimal temperature lowered the emergence percentage and delayed emergence time of bitter gourd seeds. The hard seed coat of bitter gourd seed might affect the emergence by interrupting the absorption of water and oxygen. However, priming or warm water soaking the seeds alleviated these problem to some extend. The puncture resistances of hilum of the treated seeds were lower than the non-treated seeds. Imbibitional leakage test confirmed the benefit of treatments on the membrane repairing and subsequent seed vigor. The data further indicated that these presowing treatments could reduce the accumulation of peroxides by enhancing the activities of peroxide-scavenging enzymes, and subsequently improve seedling vigor at sub-optimal temperature. Among these three treatments, treatments solid priming and solid priming＋warm water saoking were more effective in improving the seed vigor. However, the treatment solid priming＋warm water saoking is more complex than SP, therefore, treatment SP is a better way to improve the emergence percentage of bitter gourd seeds under sub-optimal temperature.
|Appears in Collections:||農藝學系|
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