Physiological Studies on Carbohydrates of Forage Plants : 4. Fructosan of leaf sheathes of several perennial grasses

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  • 牧草炭水化物の生理化学的研究 : 第4報イネ科草種によるフラクトサン重合度の多様性
  • イネ科草種によるフラクトサン重合度の多様性
  • イネカソウシュ ニ ヨル フラクトサン ジュウゴウド ノ タヨウセイ

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Difference in the composition of the nonstructural carbohydrates in leaf sheath among several perennial grasses was investigated. In the soluble fraction with 85% ethanol, a part of fructosan was distributed together with sugar such as glucose, fructose and sucrose. Amount of fructosan extractable with 85% ethanol was more in the leaf sheath containing fructosan of lower molecular size, for example as much as 20% of total fructosan in tall fescue, in which DP. of the predominant fructosan appeared to be smallest of the tested samples. Molecular sizes of fructosan determined with Sephadex gel filtration, being highest in timothy and descending in order of orchardgrass, perennial ryegrass, meadow fescue, redtop and tall fescue. The same results were obtained by determining the ratios of glucose component in their fructosan molecule. Degrees of polimerization of fructosans from redtop and tall fescue were approximately 10, perennial ryegrass and meadow fescue 20 to 30 and orchardgrass approximately 50. The predominant fructosan from timothy showed remarkably high DP. as compared with others.

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