| Texto completo | |
| Autor(es): |
Felix Alvarez, Rita de Cassia
[1]
;
Costa Crusciol, Carlos Alexandre
[2]
;
Nascente, Adriano Stephan
[3]
;
Rodrigues, Joao Domingos
[4]
;
Habermann, Gustavo
[5]
;
de Paiva Neto, Vespasiano Borges
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Fed Mato Grosso do Sul, Dept Agron, Chapadao Do Sul, MS - Brazil
[2] Univ Estadual Paulista, Sch Agron Sci, Dept Prod & Plant Breeding, Botucatu, SP - Brazil
[3] Embrapa Arroz & Feijao, Santo Antonio De Goias, Go - Brazil
[4] Univ Estadual Paulista, Inst Biosci, Dept Bot, Botucatu, SP - Brazil
[5] Univ Estadual Paulista, Inst Biosci, Dept Bot, Rio Claro, SP - Brazil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | REVISTA CAATINGA; v. 29, n. 2, p. 320-326, 2016. |
| Citações Web of Science: | 0 |
| Resumo | |
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 trinexapacethyl concentration. (AU) | |
| Processo FAPESP: | 00/02748-2 - Absorção, distribuição e redistribuição de nitrogênio (15N) em cultivares de arroz em terras altas em função da aplicação de reguladores de crescimento |
| Beneficiário: | Rita de Cássia Félix Alvarez |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |