摘要
为研究西瓜对硅的生理响应特征,以西瓜品种“8424”为试材,通过营养液沙培的方式,研究5个硅水平(0、0.3、0.9、1.8和3.2 mmol/L)对西瓜幼苗矿质元素积累、光合色素及光合指标的影响。结果表明,0~1.8 mmol/L硅浓度可使西瓜幼苗叶片叶绿素a、叶绿素b、叶绿素a+b、类胡萝卜素含量增加,而在3.2 mmol/L时上述指标降低。净光合速率、气孔导度和胞间CO 2浓度随硅浓度的增加呈先升高再降低的单峰变化规律,在1.8 mmol/L时达到最大,较对照分别提高19.45%、55.29%和29.12%,与对照差异均极显著(P<0.01),蒸腾速率呈逐渐降低的趋势。0~0.3 mmol/L硅浓度促进叶片对Mg、Ca元素的吸收积累,0.9~3.2 mmol/L硅浓度抑制叶片对Mg、Ca元素的吸收积累;0.3~3.2 mmol/L硅浓度不利于叶片对Fe、Mn元素的吸收积累。
In order to study the physiological response of watermelon to silicon,the effects of five silicon levels(0,0.3,0.9,1.8 and 3.2 mmol/L)on mineral element accumulation,photosynthetic pigments and photosynthetic indexes of watermelon seedlings were studied by sand culture in nutrient solution.The results showed that silicon promoted the increase of chlorophyll a,chlorophyll b,chlorophyll a+b and carotenoid contents in the leaves of watermelon seedlings in the range of 0-1.8 mmol/L,but decreased at 3.2 mmol/L.The net photosynthetic rate,stomatal conductance and intercellular CO 2 concentration showed a single peak change pattern with the increase of silicon concentration,which increased by 19.45%,55.29%and 29.12%respectively at 1.8 mmol/L.The difference between two groups was very significant(P<0.01),and the transpiration rate showed a decreasing trend.Silicon concentration of 0-0.3 mmol/L promoted the absorption and accumulation of Mg and Ca in leaves.Silicon concentration of 0.9-3.2 mmol/L inhibited the absorption and accumulation of Mg and Ca in leaves.Silicon concentration of 0.3-3.2 mmol/L was not conducive to the absorption and accumulation of Fe and Mn in leaves.
作者
张清华
刘震
赵跃锋
陈昆
ZHANG Qing-hua;LIU Zhen;ZHAO Yue-feng(Shangqiu Academy of Agricultural and Forestry Sciences,Shangqiu,Henan 476000)
出处
《安徽农业科学》
CAS
2020年第1期160-162,166,共4页
Journal of Anhui Agricultural Sciences
基金
河南省“四优四化”西甜瓜科技支撑行动计划示范项目
关键词
硅
西瓜
矿质元素
光合色素
光合指标
Silicon
Watermelon
Mineral elements
Photosynthetic pigments
Photosynthetic indicators
