Relationship between growth, import of assimilates, and content of phytohormones in barley ears / Kiseleva I.S., Sycheva N.M., Kaminskaya O.A., Mikhaleva O.S. // Russian Journal of Plant Physiology. - 1998. - V. 45, l. 4. - P. 465-471.

ISSN:
10214437
Type:
Article
Abstract:
The growth of barley (Hordeum vulgare L.) ears was studied as a function of import and utilization of assimilates and the hormonal status of the ear. Photoassimilate transport from leaves into the ear was studied using 14CO2 and was considered an indicator of ear sink activity evaluated from the uptake of exogenous 14C-glucose by the ear. The content of IAA, ABA, and cytokinins was studied with ELISA. Both source-sink relations and ear sink activity changed during plant growth. The most active consumption of assimilates and exogenous 14C-glucose by ears was noted at the booting (I) and milky ripeness stages (II). At stage I, the initiation and growth of elements of ear structure occurred, and cell wall polysaccharides - cellulose and hemicellulose - were synthesized in the ear from incoming assimilates. At stage II, during grain filling, incoming assimilates and exogenous glucose incorporated into starch and proteins. At stages I and II, the rate of ear growth was high, 34 and 65-70 mg/day, respectively, and zeatin content achieved its highest values of 10 and 23 ng/g dry wt, respectively. Contents of other phytohormones studied and their ratios varied: at stage I, the IAA level was at its highest, 8.8 μg/g dr wt, whereas, at stage II, the content of ABA was the highest, 6.7 μg/g dr wt. At the final stages of caryopsis maturation, ABA content decreased. It is proposed that, at these stages, the high sink activity and fast dry matter production in the ear could be related to its specific hormonal status, which determined photosynthate demand and their transport, partitioning, and metabolism.
Author keywords:
Assimilate transport; Growth rate; Hordeum vulgare; Phytohormones; Source-sink relations
Index keywords:
нет данных
DOI:
нет данных
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Affiliations Department of Plant Physiology, Faculty of Biology, Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russian Federation
Author Keywords Assimilate transport; Growth rate; Hordeum vulgare; Phytohormones; Source-sink relations
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Correspondence Address Kiseleva, I.S.; Department of Plant Physiology, Faculty of Biology, Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russian Federation; email: irina.kiselyova@usu.ru
Language of Original Document English
Abbreviated Source Title Russ. J. Plant Physiol.
Source Scopus