ISSN:
1573-5036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Changes in the amount and composition of root exudates from young bean plants were investigated. The data were compared with those obtained from plants deprived of cotyledons or of true leaves. With intact plants, it was found that the exudation gradually decreased up to the 15th day of cultivation. Thereafter, the exudation increased. In plants deprived of cotyledons, the decrease in exudation in comparison with intact plants began on the nineteenth day after planting. The decrease in exudation from intact plants and plants without cotyledons is explained by the eventual exhaustion of reserve compounds localized in the cotyledons, which are used in the formation of true leaves. In agreements with the above explanation, it was found that the roots of plants deprived of true leaves released higher quantities of exudates from the eleventh to the twentyfourth day. The kinetics of exudation of the total amount of compounds exuded from intact plants did not correspond completely to the kinetics of exudation of particular compounds or of groups of compounds. For example, the increase exudation of α-amino and imino nitrogen on the third day of cultivation resulted primarily from an increased exudation of isoleucine and glutamic acid, while the exudation of glycine, serine, threonine, and valine remained constant for fifteen days after planting. The exudation of reducing compounds decreased after the third day of cultivation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01928518
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