Correlation among physiological and histological changes in soybean seeds during storage

Aim: The aim of the study was to correlate the histological changes in cotyledon and embryonic axis in aged seeds of soybean genotypes with the physiological changes and storability. Methodology: Ten genotypes with differing, storability as predicted by accelerated ageing test, were selected and various physiological parameters viz., germination per cent, seedling length and dry weight, seedling vigour, mobilization efficiency were studied over a period of ten months at bi-monthly interval. These were correlated with histological changes like cell arrangement and cell membrane integrity in cotyledon and embryonic axis of seed. The findings were further supported by electrical conductivity test. Results: Good storer/performer (DSB 21) maintained comparatively better cell membrane integrity in both cotyledon and embryonic axis at the end of ten months of storage when compared to poor storer/performer (MAUS 61). Interpretation: Maintenance of cell membrane integrity in good storer genotype, as revealed by scanning electron microscopy, as result of better tolerance mechanism for biochemical degradation, is the main reason for higher physiological performance of all the good storer/performers genotypes during storage.