Low temperature and hardening effects on photosynthetic apparatus efficiency and survival of forage grass varieties
Low temperature and hardening effects on photosynthetic apparatus efficiency and survival of forage grass varieties
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DOI：
10.17221/57/2014-pse
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发表时间：
2014-04-01
影响因子：
2.4
通讯作者：
Kalaji, M. H.
中科院分区：
文献类型：
--
作者：
Borawska-Jarmulowicz, B.;Mastalerczuk, G.;Kalaji, M. H.
耐寒性是多年生植物所必需的，适应极端温度的能力对于它们在许多环境中的生存至关重要。利用叶绿素荧光技术，以鸭茅和多年生黑麦草的量子光合效率为指标，研究了鸭茅和多年生黑麦草的抗寒性。测定了光系统II（PSII）电子传递的量子产率（Phi（PSII））、最大叶绿素荧光产率（F-m '）和稳态叶绿素荧光产率（F-s）。Phi（PSII）受发育阶段、温度和硬化过程的影响。观察到PSII活性明显下降，特别是在-10 ℃施用后。出苗期植株硬化对PSII活性有积极影响，特别是在-5 ℃施用后。在-5 ℃温度处理72小时后，硬化植物的光合机构（0.527-0.697）比未硬化的（0.224-0.330）表现出更快的恢复。10 ℃的胁迫温度引起硬化和未硬化植株光合机构的不可逆变化（0.003-0.014），与生长阶段无关。Phi（PSII）和F-m'参数与逆境下芽的存活率密切相关。我们的研究结果表明，多年生植物的硬化使他们能够生存的低温，阿利亚是由于提高他们的光合机械性能。
Freezing tolerance is essential for perennial plants and ability to adapt to extreme temperature is crucial for their survival in many environments. Freezing tolerance of hardened and unhardened plants of Dactylis glomerata and Lolium perenne varieties was probed by their quantum photosynthetic efficiency using the chlorophyll fluorescence technique. Quantum yield of photosystem II (PSII) electron transport (Phi(PSII)), maximal (F-m') and steady-state (F-s) chlorophyll fluorescence yields of light-adapted samples were measured. Phi(PSII) depended on developmental phase, temperature and hardening process. A clear decline in PSII activity, especially after -10 degrees C application was observed. Plant hardening during emergence phase had a positive impact on PSII activity, especially after -5 degrees C application. After 72 h of -5 degrees C temperature treatment, hardened plants showed quicker recovery of their photosynthetic apparatus (0.527-0.697) as compared to unhardened ones (0.224-0.330). Stress temperature of 10 C caused irreversible changes of photosynthetic apparatus of hardened and unhardened plants independently of growth phases (0.003-0.014). Phi(PSII) and F-m' parameters were strongly correlated with shoots survival under stress. Our results suggest that perennial plants' hardening allows them to survive low temperatures due inter alia enhancing their photosynthetic machinery performance.