290
As grains always remain in dormant in unfavorable condition therefore, for
proper germination grains are exposed to appropriate environmental condition e.g.
proper temperature and moisture which will stimulate the hormones present in
grains to initiate the germination process. Optimum moisture contents and temperature will stimulate the debranching and hydrolytic enzymes and some hormones
which will liberate nutrients from germ (embryo), endosperm and scutellum from
within the seed (Gan et al. 2017). Period for sprouting usually varied seed to seed
for example 3–5 days are enough for successful germination of edible beans.
Germination process is simple, less costly, environmental friendly and recommended as safe to sprout a seed within less duration of time (Gan et al. 2017).
During germination process, complex biochemical changes occur in seeds like
hormones (gibberellin) release from embryo and reached up-to aleuronic layer of
seed and stimulate the release of different enzymes (amylases, proteases) into the
endosperm, and also lower the activity of enzyme inhibitors, all these activities will
act on compounds present in germ and endosperm therefore, convert seed from
dormant to active metabolism (Iordan et al. 2013). These enzymes will act on stored
carbohydrates and proteins and convert them to smaller molecules which will be
used by the baby plant for growth. It is interesting to know that most of these stored
compounds are not soluble into water therefore growing embryo unable to use them
until they converted to smaller components by enzymes which are soluble (Miransari
and Smith 2014).
As the germination process starts in the grains numerous phytochemical and
physiological changes took place in which complex nutrient flux occur which
includes degradation, remobilization and accumulation. Stored complex compounds
e.g. starch, lipids and proteins are catabolized during germination which resultantly
produced smaller molecules such as nitrogen and carbon which are used for the
proper growth and photosynthesis by the plant (Theodoulou and Eastmond 2012).
During germination process lot of nutrients and other bioactive compounds
increased (Donkor et al. 2012), and reduced as these compounds consumed by the
growing plant (Yang et al. 2001). It was given by Hung et al. (2012) that sprouted
waxy wheat had improved and beneficial nutritive profile as compare to nonsprouted, as it contains high amount of dietary fiber, free amino acids and phenolics.
In another study, it was reported that after 102 h germination at 20–25 °C grains
contain 2 times high amount of α-tocopherol and 2–3 times more minerals (Ozturk
et al. 2012). In same study 3.6-time higher amount of folate was found (Koehler
et al. 2007). Another research conducted by Yang and co-workers (2001), reported
that amount of ascorbic acid and tocopherol and β-carotene were not easy to detect
in un-germinated wheat grains, while in the same grains these compounds were
present in higher amounts and their amount continuously increasing after lengthening the time of germination and reached up-to optimum value after 7 days of germination. Values of vitamin C were 550 μg/g, and of α-tocopherol were 10.92 μg/g
while for β-carotene were 3.1 μg/g. In the same study amounts of ferulic and vanillic acids were also noticeably enhanced, reached optimum level after 7 days of germination which became 932.4 μg/g and 12.9 μg/g, respectively.
S. Hassan et al.
As grains always remain in dormant in unfavorable condition therefore, for
proper germination grains are exposed to appropriate environmental condition e.g.
proper temperature and moisture which will stimulate the hormones present in
grains to initiate the germination process. Optimum moisture contents and temperature will stimulate the debranching and hydrolytic enzymes and some hormones
which will liberate nutrients from germ (embryo), endosperm and scutellum from
within the seed (Gan et al. 2017). Period for sprouting usually varied seed to seed
for example 3–5 days are enough for successful germination of edible beans.
Germination process is simple, less costly, environmental friendly and recommended as safe to sprout a seed within less duration of time (Gan et al. 2017).
During germination process, complex biochemical changes occur in seeds like
hormones (gibberellin) release from embryo and reached up-to aleuronic layer of
seed and stimulate the release of different enzymes (amylases, proteases) into the
endosperm, and also lower the activity of enzyme inhibitors, all these activities will
act on compounds present in germ and endosperm therefore, convert seed from
dormant to active metabolism (Iordan et al. 2013). These enzymes will act on stored
carbohydrates and proteins and convert them to smaller molecules which will be
used by the baby plant for growth. It is interesting to know that most of these stored
compounds are not soluble into water therefore growing embryo unable to use them
until they converted to smaller components by enzymes which are soluble (Miransari
and Smith 2014).
As the germination process starts in the grains numerous phytochemical and
physiological changes took place in which complex nutrient flux occur which
includes degradation, remobilization and accumulation. Stored complex compounds
e.g. starch, lipids and proteins are catabolized during germination which resultantly
produced smaller molecules such as nitrogen and carbon which are used for the
proper growth and photosynthesis by the plant (Theodoulou and Eastmond 2012).
During germination process lot of nutrients and other bioactive compounds
increased (Donkor et al. 2012), and reduced as these compounds consumed by the
growing plant (Yang et al. 2001). It was given by Hung et al. (2012) that sprouted
waxy wheat had improved and beneficial nutritive profile as compare to nonsprouted, as it contains high amount of dietary fiber, free amino acids and phenolics.
In another study, it was reported that after 102 h germination at 20–25 °C grains
contain 2 times high amount of α-tocopherol and 2–3 times more minerals (Ozturk
et al. 2012). In same study 3.6-time higher amount of folate was found (Koehler
et al. 2007). Another research conducted by Yang and co-workers (2001), reported
that amount of ascorbic acid and tocopherol and β-carotene were not easy to detect
in un-germinated wheat grains, while in the same grains these compounds were
present in higher amounts and their amount continuously increasing after lengthening the time of germination and reached up-to optimum value after 7 days of germination. Values of vitamin C were 550 μg/g, and of α-tocopherol were 10.92 μg/g
while for β-carotene were 3.1 μg/g. In the same study amounts of ferulic and vanillic acids were also noticeably enhanced, reached optimum level after 7 days of germination which became 932.4 μg/g and 12.9 μg/g, respectively.
S. Hassan et al.