【摘要】 为了解干旱霜冻条件下甘蔗性状变化特点与评价品种耐寒性,选用国内外21个甘蔗品种(系)在广西霜冻常发区资源县开展了耐寒性评价试验。结果表明,轻霜冻前后的甘蔗锤度、绿叶数和光合速率发生明显变化,且耐寒性差的品种下降较多,但仅有重霜冻后的茎长冻损率、节间冻损率、绿叶百分率与轻霜冻后的锤度和锤度变化相关;进一步分析发现,选用茎长冻损率、上位叶绿叶百分率进行甘蔗耐寒性评价更为简单易行。耐寒性评价表明,在南亚热带和热带地区选育甘蔗品种,如果未经过耐寒性鉴定,选育的新品种其耐寒性表现好和较好的机率将低于30.0%,而表现差和较差的机率将高于60.0%。更多还原

【Abstract】 In order to understand the change characteristics of sugarcane traits and evaluate the cold tolerance of sugarcane varieties under the drought and frost conditions,the experiment was carried out in Ziyuan County,Guangxi Province where the frost occurred often with 21 domestic and abroad sugarcane varieties(elites).The results showed that there were significant changes in the brix,green leaf number and photosynthetic rate of sugarcane before and after light frost and decreased more in cold-sensitive varieties.However,the correlation was only significant between the damage rate of stem length and internode,percentage of green leaves after heavy frost in relation to sugarcane brix and brix changes after light frost.Further analysis showed that the evaluation for cold tolerance of sugarcane would be more simple and reliable with traits of the damage rate of stem length and percentage of upper green leaves.The evaluation for varieties indicated that if it was not carried out for cold-tolerance identification in breeding program,the percentage of sugarcane varieties with good cold-tolerance will be lower than 30 %,and higher than 60 % with poor cold-tolerance in subtropical and tropical regions.更多还原