Effect of Seed Mucilage on the Germination of Plantago Asiatica and Plantago Lanceolata under Salt Stress Conditions

Inagaki Hidehiro, Kishiyama Keita

Abstract


Although the role of seed mucilage in plants in arid areas has been well studied, there have been few investigations on the role of mucilage in plants in non-arid areas. In this study, we hypothesized that seed mucilage of P. asiatica, which is usually found in temperate, humid areas, may play a role in protecting seeds from external stress. This study analyzed the effect of seed mucilage on germination under salt stress in P. asiatica and P. lanceolata, which are commonly found in humid and arid areas, respectively. Under salt stress conditions, the seed germination rate of P. asiatica did not decrease, with or without mucilage. This suggests that the seeds of P. asiatica are originally salt-tolerant, regardless of seed mucilage. In contrast, in P. lanceolata, the germination rates of seeds without mucilage decreased compared to that of seeds with mucilage under salty conditions (NaCl 200 mM). From this, it is supposed that seed mucilage of P. lanceolata plays a role in protecting the germinating seed from external stresses, such as salt stress. In addition, the average germination time of seeds with mucilage tended to be shorter than that of seeds without mucilage in P. lanceolata; therefore, seed mucilage may promote its germination. In direct contrast, in P. asiatica, the average germination time of seeds with mucilage was approximately 1 to 2 days longer than that of seeds without mucilage. It could be considered that this delay in germination aids in the safe transport of seeds of P. asiatica across greater distances

Keywords


Mucilage, Germination, Plantago Asiatica, Plantago Lanceolata, Stress condition

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