Morphological structure and physiological research of heterophylly in Potamogeton octandrus
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Heterophylly is regarded as a manifestation of aquatic plants adapting to environment in evolutionary process. We studied the morphological and anatomical structure of submerged and floating leaves of Potamogeton octandrus. The changes of four endogenous hormones levels during the development of heterophylly were measured. The results showed that the epidermis thickness of floating leaves increased significantly compared with submerged leaves. The stomata only distribute on floating leaves, and the upper epidermis had obvious wax. While the submerged leaf epidermis was smooth and had no waxy ornamentation, chlorophyll content of floating leaves was significantly higher than that of submerged leaves. The four endogenous hormones showed a different change pattern in the development process of submerged and floating leaves. ABA content showed a trend of increased first and then decreased in the development of submerged leaves, while it gradually increased in floating leaves. GA3 content decreased significantly in the development of floating leaves, but showed an upward trend in submerged leaves. ZT content generally increased during the development of submerged and the floating leaves, while IAA content was the highest in the shoot and then declined rapidly. The difference characteristics in submerged and floating leaves can be considered as adaptation mechanism in plants development, and the four endogenous hormones may play different roles in development stages of heterophylly.
KeywordsAnatomical structure Chlorophyll Endogenous hormone Heterophylly Potamogeton octandrus Stomata
This work was financially supported from the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFINT2014C14, CAFYBB2014QB04) and National Natural Science Foundation of China (31400166).
- Cutler SR, Rodriguez PL, Finkelstein RR, Abrams SR (2010) Abscisic acid: emergence of a core signaling network. Annual Rev Pl Biol 61:651–679. https://doi.org/10.1146/annurev-arplant-042809-112122 CrossRefGoogle Scholar
- Deschamp PA, Cooke TJ (1984) Causal mechanisms of leaf dimorphism in the aquatic angiosperm Callitriche-heterophylla. Amer J Bot 71:319–329. https://doi.org/10.1002/j.1537-2197.1984.tb12520.x CrossRefGoogle Scholar
- Goliber TE, Feldman LJ (1989) Osmotic stress, endogenous abscisic acid and the control of leaf morphology in Hippuris vulgaris L. Pl Cell Environm 12:163–171. https://doi.org/10.1111/j.1365-3040.1989.tb01929.x CrossRefGoogle Scholar
- Mommer L, Pons TL, Wolters-Arts M, Venema JH, Visser EJW (2005) Submergence-induced morphological, anatomical, and biochemical responses in a terrestrial species affect gas diffusion resistance and photosynthetic performance. Pl Physiol 139:497–508. https://doi.org/10.1104/pp.105.064725 CrossRefGoogle Scholar
- Puértolas J, Alcobendas R, Alarcón JJ, Dodd IC (2013) Long-distance abscisic acid signalling under different vertical soil moisture gradients depends on bulk root water potential and average soil water content in the root zone. Pl Cell Environm 36:1465–1475. https://doi.org/10.1111/pce.12076 CrossRefGoogle Scholar
- Rijnders JG, Yang Y, Kamiya Y, Takahashi N, Barendse GWM, Blom CWPM, Voesenek LACJ (1997) Ethylene enhances gibberellin levels and petiole sensitivity in flooding-tolerant Rumex palustris but not in flooding–intolerant R. Acetosa. Planta 20:20–25. https://doi.org/10.1007/s004250050160 CrossRefGoogle Scholar
- Xu S, Li J, Zhang X, Wei H, Cui L (2006) Effects of heat acclimation pretreatment on changes of membrane lipid peroxidation, antioxidant metabolites, and ultrastructure of chloroplasts in two cool-season turfgrass species under heat stress. Environm Exp Bot 56:274–285. https://doi.org/10.1016/j.envexpbot.2005.03.002 CrossRefGoogle Scholar