Relationship between growth, import of assimilates, and content of phytohormones in barley ears / Kiseleva IS,Sycheva NM,Kaminskaya OA,Mikhaleva OS // RUSSIAN JOURNAL OF PLANT PHYSIOLOGY. - 1998. - V. 45, l. 4. - P. 465-471.

ISSN/EISSN:

1021-4437 / нет данных

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 (CO2)-C-14 and was considered an indicator of ear sink activity evaluated from the uptake of exogenous C-14-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 C-14-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 mu g/g dr wt, whereas, at stage II, the content of ABA was the highest, 6.7 mu g/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:

Hordeum vulgare; source-sink relations; growth rate; assimilate transport; phytohormones ABSCISIC-ACID SYNTHESIS; WHEAT EARS; GRAINS; MAIZE; RIBOSIDE

DOI:

нет данных

Web of Science ID:

ISI:000075025400009

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL-AUG
Publisher	MAIK NAUKA/INTERPERIODICA
Address	C/O PLENUM/CONSULTANTS BUREAU 233 SPRING ST, NEW YORK, NY 10013 USA
Language	English
Keywords-Plus	ABSCISIC-ACID SYNTHESIS; WHEAT EARS; GRAINS; MAIZE; RIBOSIDE
Research-Areas	Plant Sciences
Web-of-Science-Categories	Plant Sciences
ResearcherID-Numbers	Kiseleva, Irina/E-2902-2015
ORCID-Numbers	Kiseleva, Irina/0000-0002-8709-5203
Number-of-Cited-References	25
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	16
Journal-ISO	Russ. J. Plant Physiol.
Doc-Delivery-Number	104QN