Starch Hydrolytic Enzyme Activities Following Defoliation of White Clover

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Starch Hydrolytic Enzyme Activities Following Defoliation of White Clover. / Gallagher, J. A.; Volenec, J. J.; Turner, Lesley; Pollock, Christopher.

In: Crop Science, Vol. 37, No. 6, 1997, p. 1812-1818.

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Gallagher, J. A. ; Volenec, J. J. ; Turner, Lesley ; Pollock, Christopher. / Starch Hydrolytic Enzyme Activities Following Defoliation of White Clover. In: Crop Science. 1997 ; Vol. 37, No. 6. pp. 1812-1818.

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@article{d97936379a284bc69b4ec85d097e9156,
title = "Starch Hydrolytic Enzyme Activities Following Defoliation of White Clover",
abstract = "White clover (Trifolium repens L.) is an imporlanl legume in grassland ecosystems. Its persistence in mixed grass-dover swards, however, is dependent on utilization of stored carbohydrates during over-wintering and subsequent spring regrowth. Reserve carbohydrate is stored as starch in stolons. Our objective was to determine how activities of starch hydrolytic enzymes change during defoliation-induced starch mobilization in clover stolons. Starch degradation was induced by defoliating clonally propagated plants maintained in a controlled environment. Defoliation resulted in rapid, extensive starch remobilization from older stolon tissues, and prevented starch accumulation in young, developings tolon tissues. Amylasea ctivities of stolon tissue were determined immediately, 1, 2, 4, 8, and 12 d post-defoliation. Total amylolytic activity decreased following defoliation. Of the starch hydrolytic enzymea ctivities determined,o nly the activity of α-amylasc increased as a consequence of defoliation (two-fold, with respect to the control). [β-amylase, which constituted the greatest proportion of total amylolytic activity, decreased two- to three-fold in stolons of defoliated plants, but increased six-fold in young stolon tissue, and almost two-fold in old stolon tissue. The increase in enzyme activity correlated with starch deposition in control plants. Starch phosphorylase activity also decreased as a result of defoliation, while activity of α-glucosidase changed little following the defoliation treatment. Our results suggest starch degradation in stolons of white clover is regulated by α-amylase activity.",
author = "Gallagher, {J. A.} and Volenec, {J. J.} and Lesley Turner and Christopher Pollock",
year = "1997",
doi = "10.2135/cropsci1997.0011183X003700060025x",
language = "English",
volume = "37",
pages = "1812--1818",
journal = "Crop Science",
issn = "0011-183X",
publisher = "Crop Science Society of America",
number = "6",

}

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TY - JOUR

T1 - Starch Hydrolytic Enzyme Activities Following Defoliation of White Clover

AU - Gallagher, J. A.

AU - Volenec, J. J.

AU - Turner, Lesley

AU - Pollock, Christopher

PY - 1997

Y1 - 1997

N2 - White clover (Trifolium repens L.) is an imporlanl legume in grassland ecosystems. Its persistence in mixed grass-dover swards, however, is dependent on utilization of stored carbohydrates during over-wintering and subsequent spring regrowth. Reserve carbohydrate is stored as starch in stolons. Our objective was to determine how activities of starch hydrolytic enzymes change during defoliation-induced starch mobilization in clover stolons. Starch degradation was induced by defoliating clonally propagated plants maintained in a controlled environment. Defoliation resulted in rapid, extensive starch remobilization from older stolon tissues, and prevented starch accumulation in young, developings tolon tissues. Amylasea ctivities of stolon tissue were determined immediately, 1, 2, 4, 8, and 12 d post-defoliation. Total amylolytic activity decreased following defoliation. Of the starch hydrolytic enzymea ctivities determined,o nly the activity of α-amylasc increased as a consequence of defoliation (two-fold, with respect to the control). [β-amylase, which constituted the greatest proportion of total amylolytic activity, decreased two- to three-fold in stolons of defoliated plants, but increased six-fold in young stolon tissue, and almost two-fold in old stolon tissue. The increase in enzyme activity correlated with starch deposition in control plants. Starch phosphorylase activity also decreased as a result of defoliation, while activity of α-glucosidase changed little following the defoliation treatment. Our results suggest starch degradation in stolons of white clover is regulated by α-amylase activity.

AB - White clover (Trifolium repens L.) is an imporlanl legume in grassland ecosystems. Its persistence in mixed grass-dover swards, however, is dependent on utilization of stored carbohydrates during over-wintering and subsequent spring regrowth. Reserve carbohydrate is stored as starch in stolons. Our objective was to determine how activities of starch hydrolytic enzymes change during defoliation-induced starch mobilization in clover stolons. Starch degradation was induced by defoliating clonally propagated plants maintained in a controlled environment. Defoliation resulted in rapid, extensive starch remobilization from older stolon tissues, and prevented starch accumulation in young, developings tolon tissues. Amylasea ctivities of stolon tissue were determined immediately, 1, 2, 4, 8, and 12 d post-defoliation. Total amylolytic activity decreased following defoliation. Of the starch hydrolytic enzymea ctivities determined,o nly the activity of α-amylasc increased as a consequence of defoliation (two-fold, with respect to the control). [β-amylase, which constituted the greatest proportion of total amylolytic activity, decreased two- to three-fold in stolons of defoliated plants, but increased six-fold in young stolon tissue, and almost two-fold in old stolon tissue. The increase in enzyme activity correlated with starch deposition in control plants. Starch phosphorylase activity also decreased as a result of defoliation, while activity of α-glucosidase changed little following the defoliation treatment. Our results suggest starch degradation in stolons of white clover is regulated by α-amylase activity.

UR - http://hdl.handle.net/2160/43360

U2 - 10.2135/cropsci1997.0011183X003700060025x

DO - 10.2135/cropsci1997.0011183X003700060025x

M3 - Article

VL - 37

SP - 1812

EP - 1818

JO - Crop Science

JF - Crop Science

SN - 0011-183X

IS - 6

ER -

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