title: Effects of temperature and light intensity on growth and physiology in purple root water hyacinth and common water hyacinth (Eichhornia crassipes).
abstract: In this study, the interaction between temperature and light intensity was investigated in common water hyacinth (CWH) and purple root water hyacinth (PRWH). Effects of different temperatures (11/5, 18/11, 25/18, and 32/25 °C day/night) simultaneously applied at various light intensities (100, 300, and 600 μmol m(-2) s(-1)) to the plants were detected by measuring changes in the root lengths, protein content, sugar content, malondialdehyde (MDA) content, photosynthesis, and dissolved oxygen (DO). Temperature and light intensity significantly influence the growth of water hyacinths, and there was significant interaction among these environmental factors. The results suggest that several environmental factors act synergistically on the growth and physiology of water hyacinths. The higher new root length (NRL) in PRWH indicated that its root growth capacity is higher than in CWH. The soluble sugar content in leaves of CWH was higher than PRWH, indicating that relatively higher sugar content in CWH to low-temperature stress may support its tolerant nature. Lower temperature and light intensity can stimulate the accumulation of MDA content. The net photosynthetic rate (Pn) in leaves of CWH was higher than PRWH. In low temperature, increase light intensity can stimulate the Pn of PRWH and CWH. In CWH and PRWH, Pn showed a similar trend as noted for stomatal conductance (Cond) and transpiration rate (Tr). The capacity of PRWH in adding oxygen to the water column is better than those of CWH.
authors.affiliation: Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Shu
authors.forename: QuanFa
authors.initials: Q
authors.lastname: Zhang
authors.forename: WeiBo
authors.initials: W
authors.lastname: Wang
mesh_terms: D001673:Biodegradation, Environmental; D003080:Cold Temperature; D031806:Eichhornia / Q000254:growth & development* / Q000378:metabolism / Q000528:radiation effects; D031423:Hyacinthus / Q000254:growth & development* / Q000378:metabolism / Q000528:radiation effects; D008027:Light; D019216:Metals, Heavy / Q000378:metabolism; D010788:Photosynthesis; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000378:metabolism
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical