Responses of growth and photosynthetic fluorescent characteristics in Ottelia acuminata to a water-depth gradient
| Autor: | Fengbin Zhao, Wei Zhang, Yanhong Liu, Liqing Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Journal of Freshwater Ecology, Vol 33, Iss 1, Pp 285-297 (2018) |
| Druh dokumentu: | article |
| ISSN: | 0270-5060 2156-6941 02705060 |
| DOI: | 10.1080/02705060.2018.1443841 |
| Popis: | To assess the response of Ottelia acuminata to a water-depth gradient, we investigated the plant growth and leaf photosynthesis by setting three water depths (0.5, 1.0, and 1.5 m) in situ in Yilong Lake, Yunnan Province, China. The results showed that the growth and photosynthetic fluorescent characteristics of O. acuminata exhibited different responses to the water-depth gradient. The plant height, fresh weight, root length, and leaf number of O. acuminata, varied significantly with changes in the water depth. With regard to the photosynthetic fluorescent characteristics of leaves, the maximum quantum yield half-saturation light intensity and fluorescence parameter of photosystem II markedly improved with increasing water depth. The increase of photosynthetically active radiation resulted in a decreased photochemical quenching coefficient (qP). In contrast, the nonphotochemical quenching coefficient was relatively high in the leaves of O. acuminata in shallow water under high photosynthetically active radiation. The chlorophyll content of the leaves varied significantly with changes in the water depth. Higher chlorophyll a, chlorophyll b, and carotenoid contents were detected in the leaves of O. acuminata at the water depth of 1.5 m. The results of the growth and photosynthetic fluorescent characteristics of O. acuminata indicate a better protection mechanism against high light in the leaves of O. acuminata in shallow water and a higher photosynthetic efficiency, as well as a greater photosynthetic potential, in the leaves of O. acuminata in deep water. |
| Databáze: | Directory of Open Access Journals |
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