Characteristics of early maturing sugarcane [Saccharum officinarum] varieties with a high sugar content in relation to growth and invertase activities
1999
Terauchi, T. (Japan International Research Center for Agricultural Sciences, Ishigaki, Okinawa. Okinawa Subtropical Station) | Matsuoka, M. | Kobayashi, M, | Nakano, H.
Changes in stalk elongation and Brix value of early maturing sugarcane varieties with a high sugar content were compared to those in conventional varieties in a field of 12-month crop. Acid invertase (AI) and neutral invertase (NI) activities were also measured to analyze the physiological characteristics of the early maturing sugar cane variety with a high sugar content. Typical Brix value increment patterns of each variety were observed. The Brix value of NiF4, a typical early maturing variety with a high sugar content, increased in August while the stalk elongation rate of this variety decreased. The ratio of carbohydrate distribution to sucrose accumulation increased in August in this variety. AI activity, a negative factor for sucrose accumulation, decreased in NiF4 in August. The decline of AI activity may contribute to the increase of the sucrose concentration of this variety through the inhibition of stalk elongation. AI activity was relatively higher in NiF4 than in F172. It is unlikely that the level of AI activity caused varietal differences in sucrose concentration. NI activity, a positive factor for sucrose accumulation, was higher in NiF4 than in F172 throughout the seasons. It is possible that NI activity contributed to sucrose accumulation through the high flux of sugars in NiF4. These observations suggest that the re-combination pathway of sucrose accumulation should be investigated
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