Seawater Tolerance of the Beach Bean Vigna marina (Burm.) Merrill in Comparison with Mung Bean ( Vigna radiata ) and Adzuki Bean ( Vigna angularis )

Andi Septiana, Shiori P. Nakamura, Riko F. Naomasa and Hideo Yamasaki ()
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Andi Septiana: Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
Shiori P. Nakamura: Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
Riko F. Naomasa: Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
Hideo Yamasaki: Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan

Agriculture, 2025, vol. 15, issue 3, 1-11

Abstract: Seawater intrusion into soils caused by global climate change and tsunami disasters is a significant factor contributing to soil salinization in coastal vegetation areas, posing a critical threat to agriculture and food security. This study aimed to evaluate the seawater tolerance of Vigna marina , a wild Vigna species, through comparative laboratory experiments with Vigna radiata (mung bean) and Vigna angularis (adzuki bean). Unlike V. radiata and V. angularis , the seeds of V. marina exhibited significant buoyancy in seawater, remaining afloat for at least 30 days. After this prolonged seawater incubation, V. marina seeds maintained a 100% germination rate, whereas V. radiata and V. angularis failed to germinate under the same conditions. The photosynthetic activity of V. marina seedlings, evaluated via the Fv/Fm parameter, remained stable even after seven days of seawater irrigation. In contrast, V. radiata and V. angularis perished under seawater irrigation. Furthermore, V. marina seedlings exhibited sustained growth under seawater irrigation, showing consistent increases in both fresh and dry weight. These findings confirm that V. marina possesses remarkable tolerance to seawater, a critical characteristic for cultivation in areas affected by seawater intrusion.

Keywords: bean; climate change; crop; NaCl stress; food production; salt stress; seawater tolerance; soil salinization; tsunami (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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