摘要
采用营养液培养的方法,研究了低钾胁迫对甘蔗不同品系生长和光合特性的影响。结果表明:低钾胁迫显著抑制了ROC22、粤糖60号和BC2-32正常生长,植株干重分别是正常钾水平的70.66%、62.63%和52.88%;低钾胁迫处理下,甘蔗净光合速率、气孔导度和蒸腾速率均低于正常钾水平处理,但胞间CO2浓度升高。植株生物量与净光合速率之间存在极显著正相关关系(r=0.87**,n=18),说明低钾胁迫降低了甘蔗的净光合速率,进而影响了甘蔗的正常生长。
In order to study growth and photosynthetic characteristics of sugarcane plants under low potassium （K） stress, a hydroponic experiment was conducted. The results showed that ROC22, YT60 and BC2-32 were significantly inhibited by low K stress, and that the total dry weights of sugarcane plants with low K stress were 29.34%, 37.37% and 47.12% smaller than that those plants with normal K supply. In comparison to normal K supply, net photosynthetic rate （P,）, stomatal conductance （Gs） and transpiration rate （E） decreased under low K stress, but intercellular COz concentration （Ci） increased. The correlation between biomass and P. was 0.87^＊＊ （n=18）. In conclusion, low K stress reduced Pn of sugarcane plants, thereby affecting the normal growth of sugarcane plants.
出处
《甘蔗糖业》
2011年第6期1-5,共5页
Sugarcane and Canesugar
基金
科研院所技术开发研究专项(2010EG111024)
国家甘蔗产业技术体系项目
关键词
甘蔗
低钾胁迫
生物量
光合特性
Sugarcane
Low potassium stress
Biomass
Photosynthetic characteristics
