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5 Í N I Ó N A R G E N T I N A DE FISIOLOGÍA VEGETAL X X X I A r g e n t i n e P l a n t P h y s i o l o g y C o n g r e s s
E n f r e n t a n d o el c a m b i o c l i m á t i c o , h a c i e n d o s o s t e n i b l e l a p r o d u c t i v i d a d a g r o - f o r e s t a l
L i b r o de resúmenes / Book of abstracts
9 M789 87 3 IS6 1 91 7 5
ro DEL SENALAMIENTO POR ETILENO
MCADENADO POR DEFICIÊNCIA EN ÁCIDO
RBICO SOBRE EL CRECIMIENTO DE
LANTAS.
:T OF ETHYLENE SIGNALING ON PLANT
VTH TRIGGERED BY ASCORBIC ACID
ZIENCY.
:-LIA Mi, MAZORRA MORALES LM2, CONCELLÓN ERGOFF GROZEFF Gl, FOYER CH4, BARTOLI CGl
puto de Fisiologia Vegetal, Facultades de Ciências ales y Ciências Agrarias y Forestales, Universidad nal de La Plata-CCT CONICET La Plata, Argen-zSetor de Fisiologia Vegetal, LMGV, Universidade lai do Norte Fluminense, Campos dos Coytacazes, izil. 3Centro de Investigación y Desarrollo en Crio-ogia de Alimentos CCT CONICET La Plata. Facul-' Ciências Exactas, Universidad Nacional de La Plate 47 y 776, La Plata, Argentina. 4Centre of Plant es, Research tnstitute of Integrative and Compa-Biology, Faculty of Biological Sciences, University is, Leeds, LS2 9JT, UK.
lo ascórbico (AA) es un componente vital dei a rédox en plantas. Aquéllas deficientes en este olito presentan alteraciones fisiológicas como emento en la transcripción de genes involucra-el senalamiento por el etileno. El etileno es una
na vegetai que promueve ía senescencia foííar erancia frente a situaciones de estrés biótico y o. Sin embargo, no se conocen otros detalles dei Dlismo de esta hormona en plantas deficientes
Este trabajo explora la hipótesis que las alte-=s debido a la deficiência de AA son mediadas etileno. Se utilizaron plantas silvestres de Ara-s thatiana y deficientes en AA (vtc2). Se deter-ue las plantas vtc2 producen el doble de etileno silvestres. Para estudiar la participación de esta
ia en las alteraciones observadas en plantas con ntenido en AA se realizaron tratamientos con el or de la acción de etileno el i-metilcicloprope-inhibición dei etileno incremento el contenido la actividad fotosintética, la conductancia foliar cimiento en plantas vtc2 pero no en silvestres, isultados demuestran que el etileno y el AA in-an para controlar las respuestas de las plantas ! su desarrollo y adaptación al ambiente.
CONTENIDO DE PIGMENTOS FOTOSINTÉTICOS Macroptilium lathyroides L EN CONDICIONES DE SEQUÍA.
PHOTOSYNTHETIC PIGMENT LEVELS IN
Macroptilium lathyroides L UNDER WATER DEFICIT.
CELENTE MARTINS Angelitai*, AMARANTE Luciano doi, FERREIRA LARRE Cristinai, EICHHOLZ Rodrigo Fernandoi, BORELLA Junion, SANTOS DELIAS Dominique dosi, TEIXEIRA COCCO Kassia Luizai, LEITZKE Suzana2, BORTOLINI Fernanda3
ilnstitute of Biology, Department of Botany, Federal University of Pelotas - UFPel. Campus university S/N, 96160-000. Capão do Leão, RS - Brazil. 2Graduate in Agronomy, Federal University of Pelotas (UFPel), campus university S/N, 96160-000. Capão do Leão/RS -Brazil. sBrazilian Agricultural Research Corporation/ Embrapa Temperate Climate Agricultural Research Cen-ter - EMBRAPA/ CPACT - Capão do Leão, RS - Brazil. * [email protected]
Leveis of photosynthetic pigments were quantified in-Macroptilium lathyroides L under different periods of water deficit. Plants were grown in pots containing turf and soil in a in proportion as substrate. The irrigation of plants was suspended 60 days after emergency in the water restriction treatment, and substrate of con-trol plants was kept to the field capacity. Soil moisture was monítored' by gravímetry. EVaíuatíons were done at 4,11 and 18 days after suspending irrigation. The ex-periment was carried in randomized block design and the data submitted by analysis of variance. When F was significant, the means of treatments were compared by Tukey's test (pio.05). Each treatment consisted of four replicates and each replicate consisted of one pot containing three plants. Chlorophyll a leveis decreased significantly at 11 days of water deficit and chlorophyll b leveis were not affected. Total chlorophyll contents decreased at 11 and 18 days of water restriction in com-parison to the irrigated plants and treatment four days of water deficit. Total carotenoids decreased only at 18 days of water stress. M. lathyroides develops physiolo-gical mechanisms of adaptation to the stress caused by water deficit under the conditions in which the experi-ment was carried out.
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