低钾胁迫对甘蔗不同品系生长和光合特性的影响  

Effects of Low Potassium Stress on Growth and Photosynthetic Characteristics of Different Sugarcane Lines

作　　者：李奇伟[1] 卢颖林[1] 周文灵[1] 陈迪文[1] 敖俊华[1] 黄莹[1] 黄振瑞[1] 江永[1] 

机构地区：[1]广州甘蔗糖业研究所广东省甘蔗改良与生物炼制重点实验室,广东广州510316

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

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.

关 键 词：甘蔗 低钾胁迫 生物量 光合特性 

分 类 号：S566.1[农业科学—作物学]