摘要
以耐低氧性明显不同的2个网纹甜瓜品种为试材,研究了低氧胁迫下植株体内碳水化合物含量的变化特征,探讨植株体内碳水化合物含量与低氧耐性之间的关系。结果表明,低氧胁迫下网纹甜瓜根系淀粉含量下降,而茎部和叶片中有淀粉积累的现象,且在耐低氧性强的‘东方星光’叶片中淀粉积累更明显;低氧胁迫下网纹甜瓜体内可溶性糖、蔗糖、果糖含量增加,且在茎部和叶片中增加幅度较大,并以耐低氧性强的‘东方星光’中增加更明显;低氧胁迫下网纹甜瓜根系葡萄糖含量降低且低于通气对照,茎部和叶片中葡萄糖含量先增加后降低,在处理8d后低于通气对照。研究发现,网纹甜瓜体内碳水化合物含量与植株的耐低氧性密切相关;耐低氧性强的品种体内可溶性糖、蔗糖、果糖含量在低氧胁迫下比耐低氧性弱的品种更高,增幅更大;体内较高的可溶性糖、蔗糖和果糖含量是植株对低氧胁迫的一种适应性反应。
In this study,carbohydrate content changes of muskmelon plants under hypoxic stress were inves- tigated on two varieties which had contrasting hypoxic resistant traits to explore the relationship between plant carbohydrate content and its hypoxic tolerance. The results showed that under hypoxia stress,muskmelon root starch content decreased, while starch accumulated in stems and leaves. In hypoxia-resistant cultivar ＇Dongfang xingguang＇ , the degree of starch accumulation in leaves was significantly higher than that in the susceptible one. Total soluble sugar, sucrose and fructose contents all increased during hypoxia stress in muskmelon plants, especially in stems and leaves, and the degree of increment was significantly higher in the resistant cultivar ＇Dongfang xingguang than the susceptible one. The glucose content in roots continually decreased after hypoxia treatment,while in stems and leaves,it initially increased and then decreased to a level lower than that of control after 8 days hypoxia treatment. The results indicated that carbohydrate content and plant hypoxia-resistance were closely correlated^hypoxia-resistant varieties had higher contents of soluble sugar, sucrose and fructose than susceptible ones under hypoxic stress,and higher contents of soluble sugar, sucrose and fructose in planta were plant＇s adaptive responses to hypoxic stress in muskmelon.
出处
《西北植物学报》
CAS
CSCD
北大核心
2015年第1期168-174,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
现代农业产业技术体系建设专项资金(CARS-25-C-03)
江苏省农业三新工程项目(SXGC[2013]331和SXGC[2014]256)
江苏省科技支撑项目(BE2014387)
