Germination and emergence response of White Morning Glory (Ipomoea lacunose L.) to some environmental factors

Document Type : Research Paper

Authors

1 Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Iran.

2 Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Iran

3 Department of Statistics, Golestan University, Iran

Abstract

White Morning Glory (Ipomoea lacunose L.) is one of the weeds that have recently spread in the fields of Golestan province. In this study, the effect of different environmental conditions, including constant temperature, alternating temperature, water potential, salinity, high temperature, waterlogging, and burial depth on the germination and emergence of three seed populations of this plant collected in 2017, 2018 and 2019 were investigated. The results showed that the response of germination to the studied environmental factors was different in seed populations. Germination percentage started at 10°C and increased with increasing temperature. Although the germination percentage was significant at 40°C, it was completely stopped at 45°C. The water potential required to reduce 50% of germination in the seeds of 2017, 2018, and 2019 was -0.83, -0.82 and -0.43 MPa, respectively. The tolerance of this species to salt stress was much higher than to water stress, and the increase of salinity up to the potential of -1.1 to -1.4 MPa reduced its maximum germination by 50%. Increasing the high temperature to 80 and 100 °C stimulated the germination, and no seeds survived at 120°C. By increasing the burial depth by 3 cm, the emergence increased and then decreased. Knowing the germination response of this species against the mentioned factors can help predict the germination and emergence of this plant to design suitable management strategies

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