干旱区生态环境知识资源中心(Arid): 白羊草光合特性及非结构性碳水化合物含量对 CO

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	白羊草光合特性及非结构性碳水化合物含量对 CO_2浓度倍增和干旱胁迫的响应
其他题名	Responses of photosynthesis and non-structural carbohydrates of Bothriochloa ischaemum to doubled CO_2 concentration and drought stress
	肖列; 刘国彬; 李鹏; 薛萐
来源期刊	植物营养与肥料学报
ISSN	1008-505X
出版年	2017
卷号	23 期号:2 页码:389-397
中文摘要	【目的】探明 CO_2浓度倍增对干旱胁迫下白羊草光合特性及非结构性碳水化合物含量的影响,为未来大气 CO_2浓度升高以及干旱、半干旱地区水分亏缺等逆境下白羊草的生长提供理论依据和技术参数。【方法】盆栽试验采用裂区设计,研究了黄土丘陵区典型草本植物白羊草光合特性和非结构性碳水化合物(NSC)及其组分(可溶性糖和淀粉)的含量对不同 CO_2浓度(400 mumol/mol和800 mumol/mol)和不同水分处理[35%~40% FC (重度干旱胁迫)、55%~60% FC (轻度干旱胁迫)和75%~80% FC (对照)]的响应。【结果】CO_2浓度倍增和干旱胁迫对白羊草光合-光响应曲线参数和 NSC及其组分含量有显著影响,但2个因素之间没有显著的交互作用。CO_2浓度倍增显著提高了白羊草叶片最大净光合速率(P_(max))、表观量子效率(AQY)、光饱和点(LSP)和光补偿点(LCP)(P < 0.01),而干旱胁迫则显著降低了 P_(max)、AQY和 LSP (P < 0.01)。CO_2浓度倍增和干旱胁迫均提高了白羊草地上部分可溶性糖含量。在正常 CO_2浓度条件下,与对照相比,轻度干旱胁迫和重度干旱胁迫均显著降低了白羊草地上部分和根系部分淀粉含量。CO_2浓度倍增使对照、轻度干旱胁迫和重度干旱胁迫处理下白羊草地上部分淀粉含量分别提高了17.4%、44.2%和18.7%,根系部分淀粉含量分别提高了17.3%、88.4%和54.4%。轻度和重度干旱胁迫均显著降低了正常 CO_2浓度条件下白羊草根系部分 NSC含量。CO_2浓度倍增显著提高了对照处理和轻度干旱胁迫处理下白羊草地上部分以及轻度干旱胁迫处理和重度干旱胁迫处理下白羊草根系部分 NSC含量。在正常 CO_2浓度下,轻度和重度干旱胁迫导致白羊草地上部分和根系部分可溶性糖含量与总 NSC含量比值的显著提高。在倍增 CO_2浓度下,重度干旱胁迫显著提高了白羊草地上部分可溶性糖含量与总 NSC含量的比值,而对照处理和轻度干旱胁迫处理无显著差异。【结论】干旱胁迫促进了白羊草体内淀粉向可溶性糖的转化,导致可溶性糖含量的升高和淀粉含量的降低。CO_2浓度倍增促进了白羊草地上部分和根系部分淀粉和 NSC含量的积累,为干旱胁迫下白羊草生理代谢活动所需可溶性糖提供了来源。CO_2浓度升高能够缓解干旱胁迫造成的不利影响,提高了白羊草的抗旱性。
英文摘要	【Objectives】The objective of the study was to evaluate effects of doubled CO_2 concentration and drought stress on photosynthesis characteristics and non-structural carbohydrates (NSC) of Bothriochloa ischaemum, and provide scientific basis for the growth of B. ischaemum under future elevated CO_2 concentration in arid and semi-arid areas. 【Methods】 Using the split plot design, the effects of doubled CO_2 concentration and drought stress on the photosynthesis and NSC contents in B. ischaemum were investigated. The main plot was two CO_2 concentrations (ambient CO_2 concentration, 400 mumol/mol, and doubled CO_2 concentration, 800 mumol/mol), and the split-plot was three water treatments (severe drought stress, 35%-40% field capacity (FC), moderate drought stress, 55%-60% FC, and control, 75%-80% FC). 【Results】 The results showed that the parameters of photosynthesis-light response curves of B. ischaemum and the NSC contents were significantly influenced by the doubled atmospheric CO_2 concentration and drought stress, while there were no significant synergetic effects between them. The doubled CO_2 concentration significantly increased the maximum photosynthetic rate (P_(max)), apparent quantum yield (AQY), light saturation point (LSP) and light compensation point (LCP) (P < 0.01), while the drought stress significantly decreased P_(max), AQY and LSP (P < 0.01). The doubled CO_2 concentration and drought stress increased the soluble sugar content in the aboveground part of B. ischaemum. Under ambient CO_2 concentration, the moderate drought stress and severe drought stress significantly decreased the starch contents in the aboveground and root parts of B. ischaemum. The doubled CO_2 concentration increased the starch contents in the aboveground part of B. ischaemum by 17.4%, 44.2%, and 18.7%, respectively under the control, moderate drought stress and severe drought stress, and in the root part by 17.3%, 88.4%, and 54.4%, respectively. Under ambient CO_2 concentration, the moderate drought stress and severe drought stress significantly decreased the NSC contents in the root part of B. ischaemum. Under the doubled CO_2 concentration, the NSC contents in the aboveground part were significantly increased under the control and moderate drought stress treatments, and the NSC contents in the root part were significantly increased under the moderate drought stress and severe drought stress treatments. Under ambient CO_2 concentration, the moderate drought stress and severe drought stress significantly increased the ratios of soluble sugar contents and NSC contents in the aboveground and root parts of B. ischaemum. Under the doubled CO_2 concentration, the severe drought stress significantly increased the ratio of soluble sugar content and NSC content in the aboveground part of B. ischaemum, and the ratios under the control and moderate drought stress had no significant difference. 【Conclusions】Drought stress facilitated the transfer of starch into soluble sugar, and increased the soluble sugar content and decreased the starch content. The doubled CO_2 concentration increased the starch contents and NSC contents in the aboveground part and root part, and provided the source of soluble sugar that maintained metabolic activities and survival during the drought event. Therefore, it is speculated that in arid and semi-arid areas, elevated CO_2 concentration could increase plant photosynthesis, increase NSC accumulation, alleviate the adverse effect induced by drought stress, and improve the drought resistance. Our findings provided new insights into the underlying mechanisms and responses of plant species to future climate changes.
中文关键词	CO_2浓度倍增 ; 干旱胁迫 ; 光合特性 ; 非结构性碳水化合物 ; 白羊草
英文关键词	doubled CO_2 concentration drought photosynthesis non-structural carbohydrates Bothriochloa ischaemum
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Agriculture
WOS研究方向	Agriculture
CSCD记录号	CSCD:5963282
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236982
作者单位	肖列, 西安理工大学, 西北旱区生态水利工程国家重点实验室培育基地, 西安, 陕西 710048, 中国.; 李鹏, 西安理工大学, 西北旱区生态水利工程国家重点实验室培育基地, 西安, 陕西 710048, 中国.; 刘国彬, 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌, 陕西 712100, 中国.; 薛萐, 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌, 陕西 712100, 中国.
推荐引用方式 GB/T 7714	肖列,刘国彬,李鹏,等. 白羊草光合特性及非结构性碳水化合物含量对 CO_2浓度倍增和干旱胁迫的响应[J]. 西北农林科技大学,2017,23(2):389-397.
APA	肖列,刘国彬,李鹏,&薛萐.(2017).白羊草光合特性及非结构性碳水化合物含量对 CO_2浓度倍增和干旱胁迫的响应.植物营养与肥料学报,23(2),389-397.
MLA	肖列,et al."白羊草光合特性及非结构性碳水化合物含量对 CO_2浓度倍增和干旱胁迫的响应".植物营养与肥料学报 23.2(2017):389-397.