中南林业科技大学学报2025，Vol.45Issue(4)：38-51,107,15.DOI:10.14067/j.cnki.1673-923x.2025.04.004
盐胁迫对三角梅光合特性与营养元素的影响
Effects of salt stress on photosynthetic characteristics and nutrient elements of Bougainvillea
摘要
Abstract
[Objective]Soil salinization severely impacts the ecological environment and agricultural production,threatening plant growth.To investigate the effects of different NaCl treatments on the photosynthetic characteristics and nutrient elements of various Bougainvillea cultivars,and to reveal their tolerance differences and adaptation mechanisms to NaCl stress.[Method]This study selected five Bougainvillea cultivars:'Shuihong','Lvyeyanghua','Xiaoyezhi','Dayezhi',and'Tazi'as experimental materials.Using a pot-controlled salinity method,four treatment concentrations of 0.0%(CK),0.2%,0.4%,and 0.6%were set.After stable growth,salt stress was applied to the plants,and the photosynthetic characteristics and nutrient elements of one-year-old plants were systematically measured,with a comprehensive evaluation of their salt tolerance.[Result]Results showed that with increasing NaCl concentration,the total chlorophyll content of'Shuihong'and'Lvyeyanghua'initially increased and then decreased,while'Xiaoyezhi'and'Dayezhi'gradually decreased.The chlorophyll a/b ratio varied,with'Tazi'and'Lvyeyanghua'having higher ratios than other cultivars.All cultivars exhibited decreased net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr),while intercellular CO2 concentration(Ci)increased,indicating that the decline in photosynthesis was mainly due to non-stomatal factors.With continued NaCl stress,all cultivars showed increased Na+absorption,but the distribution of Na+varied.K+remained high in the leaves,while Ca2+and Mg2+showed little change.The K+/Na+,Ca2+/Na+,and Mg2+/Na+ratios decreased with increasing salt concentration.The transport abilities of K+,Ca2+,and Mg2+varied insignificantly among cultivars,but'Shuihong'and'Lvyeyanghua'showed strong ion selective transport ability,while'Tazi'was less pronounced.[Conclusion]Principal component analysis indicated the salt tolerance ranking as follows:'Dayezhi'＞'Xiaoyezhi'＞'Tazi'＞'Shuihong'＞'Lvyeyanghua.'It is recommended to promote'Dayezhi,''Xiaoyezhi,'and'Tazi'in saline-alkali soils.关键词
三角梅/植物营养元素/光合特性/盐胁迫Key words
Bougainvillea/plant nutrient elements/photosynthetic characteristics/salt stress分类
农业科技引用本文复制引用
张迪,薛源,圣倩倩,曹福亮,祝遵凌..盐胁迫对三角梅光合特性与营养元素的影响[J].中南林业科技大学学报,2025,45(4):38-51,107,15.基金项目
国家自然科学青年基金项目(32101582) （32101582）
中国科学技术协会青年人才托举工程(YESS20220054) （YESS20220054）
江苏省自然科学青年基金项目(BK20210613) （BK20210613）
江苏省高等学校自然科学研究面上项目(21KJB220008) （21KJB220008）
教育部人文社会科学研究项目(21YJCZH131) （21YJCZH131）
江苏省社会科学基金项目(21GLC002). （21GLC002）
