Agricultural industry is subjected to enormous environmental constraints, particularly due to
salinity and drought. We evaluated the role of silicon (Si) in alleviating salinity and drought
induced physio-hormonal changes in soybean grown in perlite. The plant growth attributes i.e.,
shoot length, plant fresh weight and dry weight parameters of soybean improved with elevated Si
nutrition, while they decreased with NaCl and polyethylene glycol (PEG) application. The adverse
effects of NaCl and PEG on plant growth were alleviated by adding 100 mg L-1 and 200 mg L-1 Si
to salt and drought stressed treatments. It was observed that Si effectively mitigated the adverse
effects of NaCl on soybean than that of PEG. The chlorophyll contents were found to be least
affected as an insignificant increase was observed with Si application. Bioactive GA1 and GA4
contents of soybean leaves increased, when Si was added to control or stressed plants. Jasmonic
acid (JA) contents sharply increased under salinity and drought stress but declined when the plants
were supplemented with Si. Similarly, free salicylic acid (SA) level also increased with NaCl and
PEG application. However, free SA level further increased with the addition of Si to salt treated
plants, but decreased when Si was given to PEG treated plants. It was concluded that Si improves
physio-hormonal attributes of soybean and mitigate adverse effects of salt and drought stress.
Agricultural industry is subjected to enormous environmental constraints, particularly due to
salinity and drought. We evaluated the role of silicon (Si) in alleviating salinity and drought
induced physio-hormonal changes in soybean grown in perlite. The plant growth attributes i.e.,
shoot length, plant fresh weight and dry weight parameters of soybean improved with elevated Si
nutrition, while they decreased with NaCl and polyethylene glycol (PEG) application. The adverse
effects of NaCl and PEG on plant growth were alleviated by adding 100 mg L-1 and 200 mg L-1 Si
to salt and drought stressed treatments. It was observed that Si effectively mitigated the adverse
effects of NaCl on soybean than that of PEG. The chlorophyll contents were found to be least
affected as an insignificant increase was observed with Si application. Bioactive GA1 and GA4
contents of soybean leaves increased, when Si was added to control or stressed plants. Jasmonic
acid (JA) contents sharply increased under salinity and drought stress but declined when the plants
were supplemented with Si. Similarly, free salicylic acid (SA) level also increased with NaCl and
PEG application. However, free SA level further increased with the addition of Si to salt treated
plants, but decreased when Si was given to PEG treated plants. It was concluded that Si improves
physio-hormonal attributes of soybean and mitigate adverse effects of salt and drought stress.
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