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[1]沈燕,方升佐,孙志鸿.盐胁迫对欧美杂交杨异戊二烯释放和光合参数的影响[J].应用与环境生物学报,2019,25(01):83-88.[doi:10.19675/j.cnki.1006-687x.2018.03039]
 SHEN Yan,FANG Shengzuo & SUN Zhihong**.Effects of salinity stress on isoprene emission and photosynthetic parameters in Populus deltoides × Populus nigra[J].Chinese Journal of Applied & Environmental Biology,2019,25(01):83-88.[doi:10.19675/j.cnki.1006-687x.2018.03039]
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盐胁迫对欧美杂交杨异戊二烯释放和光合参数的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年01期
页码:
83-88
栏目:
研究论文
出版日期:
2019-02-25

文章信息/Info

Title:
Effects of salinity stress on isoprene emission and photosynthetic parameters in Populus deltoides × Populus nigra
作者:
沈燕 方升佐 孙志鸿
1浙江农林大学林业与生物技术学院 临安 311300 2南京林业大学林学院 南京 210037
Author(s):
SHEN Yan1 FANG Shengzuo2 & SUN Zhihong1**
1 Faculty of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Lin′an, 311300, China 2 Faculty of Forestry and Biotechnology, Nanjing?Forestry?University, Nanjing, 210037, China
关键词:
气体交换异戊二烯释放速率异戊二烯合酶反应系数二甲基烯丙基二磷酸酯库容生物量相对生长速率
Keywords:
gas-exchange isoprene emission rate isoprene synthase reaction constant pool size of dimethylallyl diphosphate biomass relative growth rate
分类号:
Q945.78
DOI:
10.19675/j.cnki.1006-687x.2018.03039
摘要:
为揭示2种欧美杨(Populus deltoides × Populus nigra)光合速率、异戊二烯释放速率、生长形态对盐胁迫的响应,以欧美杨895、欧美杨1388为试验材料,用浓度为0、0.18 mol/L的NaCl溶液对其进行处理,测定不同处理下2种欧美杨气体交换指标、异戊二烯释放的相关参数以及生物量相关的生长指标. 结果显示:盐胁迫显著降低了2种欧美杨的净光合速率(Pn)、气孔导度(gs)及蒸腾速率(Tr),但其胞间CO2浓度(Ci)并未受到影响;盐胁迫下,2种欧美杨的异戊二烯释放速率和异戊二烯合酶反应系数明显降低,但异戊二烯的直接前体物二甲基烯丙基二磷酸酯(DMADP)库容在统计学上并没受到显著的影响,这说明盐胁迫下异戊二烯释放速率的降低主要是由异戊二烯合成酶活性的降低所导致;2种欧美杨的相对生长速率和总干物质量在盐胁迫下均显著下降,其中1388品种的根和茎干重占总干物质量的比例显著高于895品种,而其叶干重刚好相反,说明2个品种不同器官的生物量分配在盐胁迫下存在差异. 综上所述,2种欧美杨对盐胁迫的响应相似,抗逆性也没有表现出显著差异,但其异戊二烯释放速率以及光合速率下降的调控机制有所差异,这很可能是2个品种不同器官的生物量分配产生差异的原因. (图4 表1 参20)
Abstract:
This study aimed to explore the responses of photosynthetic rate, isoprene emission rate, and growth morphology in two varieties of hybrid poplar crosses, Populus deltoides × Populus nigra 895 and P. deltoides × P. nigra 1388, under salinity conditions. The gas exchange indicators, isoprene emission parameters, and biomass growth index were measured during salinity stress imposed by the addition of 0 and 0.18 mol/L NaCl. Salinity stress substantially reduced the net assimilation rate (Pn), stomatal conductance (gs), transmission rate (Tr) of the both varieties; however, the intercellular CO2 concentration (Ci) was not affected. The isoprene emission rate and isoprene synthase (IspS) reaction constant decreased obviously under salinity in both varieties, showing a statistically insignificant influence on the pool size of isoprenoid precursor dimethylallyl diphosphate (DMADP). The relative height growth rate and total dry weight were significantly decreased under salinity in both varieties, and the ratio of the root and stem weight to total dry weight variety 1388 was significantly higher than that of variety 895, while their leaf dry weights showed the opposite trend. In conclusion, the decrease in isoprene emission rate was mainly due to the decrease in isoprene synthase activity under salinity; the salinity stress responses were similar in both varieties. No significant differences were observed in resistance, but the regulatory mechanisms of isoprene emission and net assimilation rates were different, which was probably the reason for the differences in biomass allocation among different organs of the two studied varieties.

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更新日期/Last Update: 2019-02-25