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Assessment of tolerances in Mitragyna parvifolia (Roxb.) Korth. and Syzygium cumini Keels. seedlings to waterlogging

Bidalia, A., Okram, Z., Hanief, M., Rao, K.S.
Photosynthetica 2018 v.56 no.2 pp. 707-717
Mitragyna, Syzygium cumini, adventitious roots, biomass, flooded conditions, mortality, national parks, photosynthesis, seedlings, vegetation, wetlands, India
Waterlogging is one of the critical factors controlling the distribution, regeneration, and survival of vegetation in wetlands. Here, we tested the hypothesis that Mitragyna parvifolia (Roxb.) Korth. and Syzygium cumini Keels, inhabiting the Keoladeo National Park, a Ramsar wetland (Bharatpur, India), are tolerant to waterlogging. The morphological and photosynthetic variables of four-month-old seedlings subjected to waterlogging, along with the concentrations of macroand micronutrients, were examined. After 35 days, treatment was halted due to high mortality of S. cumini seedlings in contrast to that of M. parvifolia seedlings. Significant declines in most of the studied variables were observed in both species when compared with their respective controls. In addition, M. parvifolia seedlings developed adventitious roots and lenticels and showed an increased root biomass. Based on the results, we concluded that adaptive traits displayed by M. parvifolia seedlings facilitate its tolerance to waterlogging in contrast to S. cumini seedlings.