摘要
【目的】为了研究源氯对花魔芋苗期生长发育及Cl^-分配的影响。【方法】以花魔芋为实验材料,通过盆栽试验,研究了不同浓度的外源氯处理下花魔芋苗期病死率、光合速率、叶绿素含量、根系活力、壮苗指数等指标的变化,并探讨了外源施氯对苗期花魔芋生长发育及CI-分配的影响。【结果】随外源氯浓度的增加,花魔芋病死率呈先降后升的趋势,在16 mmol/L时最低且极显著低于对照,且各处的病死率均低于对照;花魔芋光合速率、生长速率、干物质积累速率、根系活力以及壮苗指数均随外源氯浓度的增加而呈先增后减的趋势,分别在32、4、4、8和8 mmol/L时最高,分别在64、32、32、256和128 mmol/L时显著或极显著低于对照;随外源氯浓度的增加,花魔芋叶绿素含量不断下降,在32 mmol/L时显著低于对照,在128 mmol/L时极显著低于对照;花魔芋各器官干物质分配量在外源氯浓度≤16 mmol/L时叶>茎>根,而在≥32 mmol/L时叶>根>茎;花魔芋植株和各器官氯离子含量均随外源氯浓度的增加而增加,各处理均显著或极显著高于对照,各器官氯离子含量均为根>叶>茎,各器官氯离子分配率均为叶>根>茎,高氯下分配到叶中的氯明显增加,分配到茎中的氯明显减少,而根则相对较为稳定。【结论】因此,适当施氯对花魔芋苗期生长发育无显著不良影响,甚至还有促进作用,而高氯对花魔芋具有毒害作用,显著抑制其生长发育。
【 Objective】The paper aims to study the effect of different concentrations of exogenous chlorine on growth and chloride’s distribu-tion of the Amorphophallus konjac in seedling stage. 【Method 】Taken the as tested materials, under differentconcentrations of exogenous chlorine , the case-fatality rate , the photosynthetic rate , the chlorophyll content , the root activity and the sound seedling index were studied by pot experiments, and the effects of the different concentrations of exogenous chlorine on growth and distribu-tion of chloride ion of the Amorphophalluskonjac in seedling stage wereinvestigate. [ Result] The results showed that： Along with the increase of chlorine concentration, the case-fatality rate of the A. konjac showed down first and then up, and when the concentration of chloride ion is at 16 mmol/L, the case-fatality rate is the lowest and it is most significantly lower than the control group. In various treatment, the case-fa-tality rate of the A. konjac were lower than control group. Along with the concentrations of exogenous chlorine increasing, the photosynthetic rate, growth rate, dry matter accumulation rate, root activity and sound seedling index of the A. konjac increased firstly and then decrease. When the concentrations of exogenous chlorine respectively were at 32, 4 , 4, 8 , and 8 mmol/L, they reached a maximu value. When the concentrations of exogenous chlorine respectively were at 64,32, 32, 256 and 128 mmol/L, they were significantly or very significantly low-er than the control group. The chlorophyll content decreased continuously along with the increase of chlorine concentration. Its was signifi-cantly lower than the control group at 32 mmol/L and was very significantly lower than the control group at 128 mmol/L. When the chlorine concentration is less than or equal to 16 mmol/L , the dry matter5 s distribution rate of various organs were ： the leaf 〉 the stem 〉 the root. However, when it is greater than or equal to 32 mmol/L, they were ： the leaf 〉 the root 〉 the stem. The chloride ion content of individual and various organs in-crease with increasing chloride ion concentration, and the all treatments were significantly or very significantly higher than the control, and the chloride ion content of various organs was ： the root 〉 the leaf 〉 the stem. In the high concentration chlorine element treatments , the Chlorine amount was increased significantly in the leaf , was dropped markedly in the stem, and was stabilized in the root relatively.【 Con-clusion】 Therefore, the proper chlorine fertilizer application had no effect on growth＂of the A. konjac in seedling stage, and even to promote it. But high levels of exogenous chlorine was toxic to the A. konjac and restrained significantly its5 growth.
出处
《西南农业学报》
CSCD
北大核心
2017年第11期2562-2567,共6页
Southwest China Journal of Agricultural Sciences
基金
基金项目:重庆市"121"科技支撑示范工程(104190/40605014)
关键词
花魔芋
外源氯
苗期
生长发育
A konjac
Exogenous chlorine
Seedling stage
Growth
