大丽花光合作用和蒸腾作用对高温胁迫的响应,Horticulturae

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大丽花光合作用和蒸腾作用对高温胁迫的响应
Horticulturae Pub Date : 2023-09-18 , DOI: 10.3390/horticulturae9091047
Jing-Jing Liu ₁ , Ying-Chan Zhang ₁ , Shan-Ce Niu _{1,

2} , Li-Hong Hao ₁ , Wen-Bin Yu ₃ , Duan-Fen Chen ₁ , Di-Ying Xiang ₁

Affiliation

夏季高温会导致大丽花生长困难或开花困难，是限制大丽花栽培和应用的关键问题。研究高温胁迫下大丽花的光合生理机制，为扩大栽培应用范围和增产提供理论依据。两个大丽花品种“Tampico”和“Hypnotica Tropical Breeze”被用作测试材料，并在 35/30 °C 或 40/35 °C 的温度下处理 1 天或 2 天（白天/晚上：14 小时/ 10 h)，然后在 25/20 °C 下恢复 7 d。使用 25/20 °C 处理作为对照。结果表明：（1）高温胁迫导致叶绿素（Chl）含量、Fv/Fm、蒸腾速率（Tr）、净光合速率（Pn）和水势显着降低，Chl含量、特, 同期'Tampico'的气孔密度和气孔密度均高于'Hypnotica Tropical Breeze'。(2) 两个大丽花品种经高温胁迫处理并在25/20 ℃恢复7 d后，35/30 ℃处理下的植株形态和各项生理指标逐渐恢复正常，'Tampico ” 状况比“Hypnotica Tropical Breeze”更好。(3)两个大丽花品种均不能承受40/35℃2天的胁迫。'Tampico' 的状况比 'Hypnotica Tropical Breeze' 更好。(3)两个大丽花品种均不能承受40/35℃2天的胁迫。'Tampico' 的状况比 'Hypnotica Tropical Breeze' 更好。(3)两个大丽花品种均不能承受40/35℃2天的胁迫。

"点击查看英文标题和摘要"

Response of Dahlia Photosynthesis and Transpiration to High-Temperature Stress

The high temperature may cause difficult growth or bloom in the summer, which is the key problem limiting the cultivation and application of dahlia. The photosynthetic physiological mechanisms of dahlia under high temperature stress were studied to provide a theoretical basis for expanding the application range of cultivation and annual production. Two dahlia varieties, ‘Tampico’ and ‘Hypnotica Tropical Breeze’, were used as test materials and were treated for 1 d or 2 d at temperatures of 35/30 °C or 40/35 °C (day/night: 14 h/10 h) and then recovered at 25/20 °C for 7 d. A 25/20 °C treatment was used as the control. The results are as follows: (1) High-temperature stress resulted in the chlorophyll (Chl) content, Fv/Fm, transpiration rate (Tr), net photosynthetic rate (Pn), and water potential decreasing significantly, and the Chl content, Tr, and stomatal density of ‘Tampico’ were higher than those of ‘Hypnotica Tropical Breeze’ during the same period. (2) After the two dahlia varieties were treated with high-temperature stress and recovered at 25/20 °C for 7 d, the plant morphology and various physiological indices under the 35/30 °C treatment gradually returned to normal, with ‘Tampico’ in better condition than ‘Hypnotica Tropical Breeze’. (3) Both dahlia varieties could not withstand the stress of 40/35 °C for 2 days.

更新日期：2023-09-18

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