Low temperature stress-induced biochemical changes affect stubble bud sprouting in sugarcane (<Emphasis Type="Italic">Saccharum</Emphasis> spp. hybrid) |
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Authors: | Radha Jain A K Shrivastava S Solomon R L Yadav |
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Institution: | (1) Indian Institute of Sugarcane Research, Lucknow, 226002, India |
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Abstract: | A laboratory experiment was conducted to study the effect of low temperature stress on stubble bud sprouting and associated
biochemical changes in sugarcane (Saccharum spp. hybrid). At 25°C, stubble bud sprouting was about 80%, whereas at 15 and 6°C, it was 56% and 23%, respectively. In stubble
buds, the levels of reducing sugars and acid invertase were low, while IAA, total phenols and proline contents were high at
low temperatures, as compared to normal temperature (25°C). Similarly, the specific activities of antioxidant enzymes, viz.,
catalase and peroxidase in stubble buds were higher at low temperatures than at normal temperature. The results indicate that
poor sprouting of stubble buds at low temperatures appears to be due to a reduced availability of reducing sugars concomitant
with a lower activity of acid invertase. An increased level of IAA together with toxicity build-up in situ due to an accumulation
of total phenols may be responsible for the maintenance of dormancy in stubble buds at low temperatures. On the other hand,
higher activities of catalase and peroxidase enzymes may protect stubble buds from an oxidative damage, while proline accumulates
to act as an osmoprotectant under low temperature stress. |
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Keywords: | Acid invertase Catalase IAA Low temperature stress Peroxidase Proline Reducing sugars Saccharum spp hybrid Sugarcane |
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