1962, English, Article
Studies on the Physiology of Rice: XV. CHANGES IN THE NITROGEN METABOLISM OF SEEDS DURING GERMINATION AND THEIR RELATION TO THE APPLICATION OF GROWTH REGULATORS
SIRCAR, S. M.; RAY, PROTIMA DATTA
Seeds of rice variety ‘Chinsurah Boro’ were treated with two concentrations of indoleacetic acid (IAA) and maleic hydrazide (MH), 0.1 mg. per litre and 0.01 mg. per litre, during the first 7 days of germination, and the resulting changes in nitrogen metabolism of both endosperm and embryo were determined. The seedling growth at different times during the treatment was recorded. Uptake of water by the embryo increased up to 72 hours, but thereafter the percentage water content fell, owing to large-scale translocation of dry matter to it. The endosperm showed increasing water content for 5 days. There are two marked stages of nitrogen metabolism of the seed during germination. During the first 72 hours hydrolysis of protein in the endosperm and translocation of soluble nitrogen to the embryo are the predominant features. Thereafter the embryo actively synthesizes protein from the products of translocation. IAA and MH affected the seedling growth similarly. Initially there was a small retardation of leaf growth, but at later periods recovery took place. Root growth was more adversely affected than shoot growth, the effect also persisting longer. These changes in growth were reflected in the nitrogen metabolism of the seedlings. For the first few days IAA and MH retarded the supply of soluble nitrogen from the endosperm to the embryo, consequently there was less soluble nitrogen in the embryo though protein synthesis there was affected only slightly. The difference in soluble nitrogen between the treated and untreated embryos persisted throughout the seven days. An attempt is made to explain this on the basis that primarily IAA and MH retard the enzymatic activity responsible for the hydrolysis of protein in the endosperm.
Copyright (C) 1962, Society for Experimental Biology
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