镉对3个苎麻品种生长和光合特性的影响  

Effects of Cadmium on Growth and Photosynthetic Characteristics of Three Ramie Cultivars

作　　者：李雪玲[1] 佘玮[1] 李林林[1] 刘楠楠[1] 白玉超[1] 崔国贤[1,2] LI Xueling SHE Wei LI Linlin LIU Nannan BAI Yuchao CUI Guoxian(Ramie Research Institute of Hunan Agricultural University, Changsha 410128 , China Institute of Bast Fiber Crops, CAAS, Changsha 410205 ,China)

机构地区：[1]湖南农业大学苎麻研究所,长沙410128 [2]中国农业科学院麻类研究所,长沙410205

出　　处：《中国麻业科学》2017年第3期130-135,共6页Plant Fiber Sciences in China

基　　金：国家麻类产业技术体系(CARS-19-E20);国家自然科学基金(31471543);湖南省研究生科研创新(CX2015B232);中国农业科学院科技创新工程(ASTIP-IBFC07)

摘　　要：为了解不同基因型苎麻在镉胁迫下变化差异性,以对镉积累能力不同的3个苎麻品种"中苎1号"、"华苎5号"、"川苎8号"为试验材料,采用温室盆栽试验,研究了5、25、50 mg/L镉胁迫对苎麻生物量、叶片SPAD值及光合特性的影响。结果表明:镉处理会抑制苎麻生长和光合作用,株高、生物量、SPAD值、光合参数都受镉胁迫而下降;不同品种苎麻受镉胁迫时生长变化不一致,苎麻对镉的敏感性由高到低为"中苎1号">"川苎8号">"华苎5号"。低浓度(5 mg/L)镉胁迫对苎麻生长有显著促进作用;"中苎1号"的生长在中、高浓度(25~50 mg/L)镉胁迫下显著被抑制,"华苎5号"和"川苎8号"生长受镉浓度变化影响低于"中苎1号",生长较稳定;不同浓度镉对苎麻光合特性各参数值影响不一致,参数值变化幅度与镉浓度相关性不大,苎麻光合速率的降低主要限制因素是非气孔因素,3个品种对镉胁迫时光合参数响应反应不一致。To study the difference of the different ramie cultivars under cadmium stress, ＂ Zhong zhu 1＂ , ＂ Hua zhu 5＂ and ＂ Chuan zhu 8＂ were used as experimental materials, which have different cadmi-um accumulation ability. The influences of Cd stress （5, 25, 50 mg/L ） on ramie biomass, leaf SPAD value and photosynthetic characteristics were studied in greenhouse. The results showed that Cadmium treatment inhibited the growth and photosynthesis of ramie. The plant height, biomass, SPAD and photo-synthetic parameters were decreased under cadmium stress. The growth of different ramie cultivars was different under cadmium stress, and the sensitivity of ramie to cadmium was Zhong zhu 1 〉 Chuan zhu 8 〉 Hua zhu 5. The growth of Zhong zhu 1 was significantly promoted under low concentration （5 mg/L） cadmium, the growth of Hua zhu 5 and Chuan zhu 8 was less affected than Zhong zhu 1 under medium and high concentration （25 -50 mg/L） cadmium,and the growth was more stable. The effect of different concentrations of cadmium on the photosynthetic characteristics of ramie was not consistent, and the change of parameter value was not correlated with the concentration. The main limiting factor of the decrease of photosynthetic rate of ramie was non - stomatal factor, and the responses of the three cul- tivars to photosynthetic parameters of cadmium stress were inconsistent.

关 键 词：苎麻 镉 生长 SPAD值 气体交换参数 

分 类 号：S563.1[农业科学—作物学]