不同花色香水莲花花期花瓣生理指标变化分析

Changes of physiological indexes of petals during the flowering period of Nymphaea hybrid of different colors

  • 摘要: 【目的】探究睡莲属珍贵水生植物香水莲花开花至衰老进程中花瓣生理指标变化规律,为香水莲花的花期调控及开发应用提供理论依据。【方法】以紫花、粉花、黄花和白花4种不同花色香水莲花为试验对象,测定其开花过程中花瓣可溶性糖(SS)、可溶性蛋白(SP)、淀粉(St)和脯氨酸(Pro)含量,及过氧化物酶(POD)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和多酚氧化酶(PPO)的活性,以及丙二醛(MDA)含量、细胞膜透性、脂肪酶(Lip)和脂肪氧合酶(LOX)的活力,并进行各指标间的相关性分析,研究不同花色香水莲花花期各生理指标的变化规律。【结果】4个不同花色香水莲花花瓣内SS和SP含量均先增后减,在盛花期达峰值,至末花期迅速下降,而St总体呈先降后升再降的趋势,Pro含量自初花期不断减少。不同酶活性变化存在差异,POD、SOD、CAT和PPO酶活性随花期呈先上升后下降的变化趋势,其中POD和PPO活性的最大值均出现在盛花期;紫花型和粉花型香水莲花的SOD和CAT活性的峰值出现在初花期,而黄花型和白花型香水莲花的峰值则出现在盛花期。花瓣中MDA含量和细胞膜透性均不断上升;Lip活性总体上呈下降—上升—下降的变化趋势,而LOX活性则随花期不断下降,在末花期活性最低。香水莲花开花过程中生理指标的相关分析表明,营养物质、保护酶及抗逆物质起正向调节作用,而MDA和细胞膜透性具有负向调控作用。【结论】香水莲花开花与衰老受多因素共同影响,花期花瓣中营养物质、保护酶及抗逆物质的协同作用,可延缓衰老,而膜脂过氧化作用的加剧则促使花瓣衰老、凋亡。黄花型香水莲花花期较长,观赏价值更高,值得在生产及景观中进一步推广运用。

     

    Abstract: 【Objective】To explore the changes in the physiological indexes of petals in the process from flowering to senescence of Nymphaea hybrid, a precious aquatic plant of the water lily group, and to provide a theoretical basis for the regulation of the flowering period and the development and application of N. hybrid.【Method】N. hybrid plants of four different colors(purple, pink, yellow and white) were taken as the research objects. Physiological indexes such as the content of soluble sugar(SS), soluble protein(SP), starch(St) and proline(Pro), enzyme activities including peroxidase (POD), superoxide dismutase(SOD), catalase(CAT) and polyphenol oxidase(PPO), the content of malondialdehyde (MDA), cell membrane permeability and the activities of lipase(Lip) and lipoxygenase(LOX) were determined at different flowering stages of the petals, and the correlation analysis of each index was carried out. The change rules for the physiological indexes of N. hybrid of different colors were studied during the flowering period.【Result】During the flowering and senescence period, the contents of SS and SP of the four N. hybrid flowers increased first and then decreased with the flowering process, reaching a peak at the full flowering stage, and rapidly decreased to the final flowering stage, while the St showed a trend of falling first and then rising and falling again. The content of Pro in the petals decreased continuously from the initial flowering stage. The changes of enzyme activities were different:the activities of POD, SOD, CAT and PPO enzymes increased first and then decreased, the maximum activity of POD and PPO appeared at the flowering stage, and the peak activity of SOD and CAT in purple and pink N. hybrid appeared at the initial flowering stage, while the peak activity in yellow and white N. hybrid appeared at the flowering stage. The MDA content and cell membrane permeability in the petals increased continuously. Lip activity showed a decreasing, increasing and decreasing trend, while LOX activity decreased with flowering stage, reaching its minimum at the final flowering stage. The correlation analysis of the physiological indexes of N. hybrid showed that nutrients, protective enzymes and anti-stress substances had positive regulatory effects, while MDA and cell membrane permeability had negative regulatory effects.【Conclusion】The flowering and senescence of N. hybrid petals are affected by many factors. The synergistic effect of nutrients, protective enzymes and antistress substances in petals during flowering candelay the process of senescence, while the aggravation of membrane lipid peroxidationcan lead to senescence and apoptosis of petals. The yellow N. hybrid has a longer flowering period and higher ornamental value, and is worthy of further popularization and application in production and landscape settings.

     

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