Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

TRINEXAPAC-ETHYL AFFECTS GROWTH AND GAS EXCHANGE OF UPLAND RICE

Full text
Author(s):
RITA DE CASSIA FÉLIX ALVAREZ [1] ; CARLOS ALEXANDRE COSTA CRUSCIOL [2] ; ADRIANO STEPHAN NASCENTE [3] ; JOÃO DOMINGOS RODRIGUES [4] ; GUSTAVO HABERMANN [5] ; VESPASIANO BORGES DE PAIVA NETO [6]
Total Authors: 6
Affiliation:
[1] Universidade Federal de Mato Grosso do Sul. Departament of Agronomy - Brasil
[2] Universidade Estadual Paulista. School of Agronomic Sciences. Department of Production and Plant Breeding - Brasil
[3] Embrapa Arroz e Feijão - Brasil
[4] Universidade Estadual Paulista. Institute of Biosciences. Department of Botany - Brasil
[5] Universidade Estadual Paulista. Institute of Biosciences. Department of Botany - Brasil
[6] Universidade Federal de Mato Grosso do Sul. Departament of Agronomy - Brasil
Total Affiliations: 6
Document type: Journal article
Source: Rev. Caatinga; v. 29, n. 2, p. 320-326, 2016-06-00.
Abstract

ABSTRACT: A major problem affecting some upland rice cultivars is the increase in plant size when subjected to high doses of nitrogen fertilizer, leading to high levels of lodging. A method to reduce the height of upland rice, and therefore lodging, would be to use plant growth regulators. However, little information exists on the effect of these regulators on plant physiological processes. Therefore, the objective of this study was to evaluate the influence of trinexapac-ethyl application in upland rice via analysis of growth and gas exchange. The experiment was carried out under greenhouse conditions using the BRS Primavera cultivar. A completely randomized design with eight replications was used. Treatments were carried out with and without the application of the plant growth regulator, and plants were subject to two-stage assessments in which physiological and gas-exchange indices were measured. The use of trinexapac-ethyl improved the growth of rice plants from the flowering to the physiological maturity stage, resulting in higher values of leaf area ratio, specific leaf area, and leaf matter ratio in treated plants. At the same time, it provided smaller reduction in net CO2 assimilation at the physiological maturity stage. Thus, net/apparent assimilation rate did not change after the application of growth regulator, but relative growth rate decreased in these treated plants. These results indicate the occurrence of self-shading in rice plants induced by what might be a supra-optimum trinexapac-ethyl concentration. (AU)