Abstract
Soybean [Glycine max (L.) Merr.] responded differently to storage stress factors. This research work aimed at assessing genetic potentials of fifteen soybean varieties to storage stress via accelerated aging technique and grouping them based on their levels of tolerance to storage stress using simple sequence repeat (SSR). Tolerance of the seed of 15 soybean varieties to storage stress was assessed by subjecting them to accelerated aging for 0, 6, 12, and 24 hours at 42 °C temperature and 100 % relative humidity (RH), after which their quality was assessed to determine their tolerance to storage stress. Same varieties were also stored for 6 months under ambient environment at 65 ± 5 % R.H and 25 ± 2 °C and they were genotyped with 19 simple sequence repeat (SSR) markers. The varieties were grouped on the basis of their levels of tolerance to storage stress. The principal components analysis (PCA) showed that germination rate index (GRI) and germination index (GI) were the major indices responsible for the significant variation in the seedling vigor characters. TGX1835-10E and TGX1448-2E were identified as varieties with good storage ability and therefore recommended for storage improvement in soybean breeding programs. Six SSR markers (Satt 565, Satt 175, Satt 281, Satt 600, Satt 160 and Satt 281) were identified as candidate markers for detection of alleles for tolerance to storage stress.
Highlights
Soybean (Glycine max (L.) Merrill) is one of the oldest cultivated leguminous crops (Verma and Shoemaker, 1996)
It has been reported that loss of germination potential of soybean seed is more acute in tropical and sub-tropical regions of the world when compared with temperate environments (Bhatia, 1996)
In solving problem of soybean seed deterioration during storage, there is need to understand genetic traits responsible for tolerance to storage stress, this research work aimed at assessing genetic constituents of fifteen soybean varieties and their response to storage stress via accelerated aging technique with a view to grouping them based on their levels of tolerance to storage stress using Simple Sequence Repeat (SSR) prim
Summary
Soybean (Glycine max (L.) Merrill) is one of the oldest cultivated leguminous crops (Verma and Shoemaker, 1996) It is one of the most important economical legumes in the world, providing protein and oil to food and animal feed industries, as well as base ingredients for hundreds of chemical products (Hedley, 2001). It has been reported that loss of germination potential of soybean seed is more acute in tropical and sub-tropical regions of the world when compared with temperate environments (Bhatia, 1996) This is because temperature, which is one of the major storage stress factor affects the storability of the seeds and causes chemical changes, such as hydrolytic and oxidative rancidity (changes in oil quality) in the seeds, leading to reduced seed quality and subsequent loss of viability across time (Baskin and Delouche, 1973). Researchers have explored the use genetic variability among germplasms to solve genetic and agronomic problems
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