Understanding the Water Absorption Dynamics in Relation to Hardseededness in Mung bean (Vigna radiata L.) Genotypes
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Authors
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DEBASHIS PAUL
3 Ramakrishna Mission Vivekananda Educational & Research Institute, Kolkata, West Bengal, India
Author
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S K CHAKRABARTY
3 Ramakrishna Mission Vivekananda Educational & Research Institute, Kolkata, West Bengal, India
Author
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NIDHI
3 Ramakrishna Mission Vivekananda Educational & Research Institute, Kolkata, West Bengal, India
Author
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SUMAN DUTTA
3 Ramakrishna Mission Vivekananda Educational & Research Institute, Kolkata, West Bengal, India
Author
Keywords:
Imbibition, Hard seeds, Kharif, summer, Mung beanAbstract
Hardseededness, common in majority of pulse crops, is considered an undesirable character which
adversely affects their culinary use. Hardseededness results from reduced permeability of the seed coat to water,
hence also impacts germination. Addressing a knowledge gap in this area, the current investigation was undertaken
on three hardseeded and three non-hardseeded mung bean genotypes in an attempt to understand the impact of
genotype, storage period, and scarification treatments on water absorption dynamics in mung bean. The water
uptake patterns of three hardseeded and three non-hardseeded genotypes produced during the Kharif and summer
seasons of 2019, were studied in fresh and 18-month stored control and scarified seeds. The degree of
hardseededness, judged by imbibition time, was higher in seeds produced during the Kharif season compared to
the summer season in all genotypes. Notably, non-hard seeds displayed a higher increase in weight per unit time,
affirming a more rapid water uptake compared to hard seeds produced during the Kharif season. Conversely,
genotypes grown in the summer season showed a lower lag phase and early radical protrusion. Stored seeds
exhibited a pattern similar to those produced in the summer season with a lower lag phase duration. Scarified
seeds demonstrated the shortest lag phase, with the second rise in water absorption occurring within 8-10 hours.
It was concluded that mung bean may be cultivated in summer season for the for the purpose of seed production,
and the study emphasized the effectiveness of scarification as a proven method to alleviate coat-imposed dormancy,
facilitating easier water entry into the seeds and promoting early radical protrusion.
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