caa a22 4500 397521421 CHVBK 20180308164633.0 cr unu---uuuuu 161202e199506 xx s 000 0 eng 10.1093/jxb/46.6.639 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.6.639 Effect of seasonal drought and cactus X virus infection on the crassulacean acid metabolism of Agave sisalana plants growing in a neotropical savanna [Elektronische Daten] [Maria Luisa Izaguirre-Mayoral, Edgloris Marys, Elizabeth Olivares, Tamara Oropeza] Healthy and cactus X virus-infected Agave sisalana plants were collected during the dry and rainy seasons in two contrasting savanna sites. At site 1, the soil water content showed no seasonal variations, but at site 2 it was much lower during the dry season than in the rainy season. When compared to healthy plants (HP), virus infection reduced the total leaf area, the Δ of titratable acidity and the water content of the plants, regardless of the season. In virus-infected plants at site 1 (VIP-1) the magnitude of the effect elicited by the virus did not differ between seasons, whereas, in virusinfected plants at site 2 (VIP-2) the deleterious effect of the virus was more pronounced during the dry season. In the dry season, VIP-1 and VIP-2 accumulated more fructans along the diurnal cycle and had higher net diurnal carbon gain than HP, with higher values in VIP-2. With the onset of rain the total leaf area of VIP-2 increased and the Δ of titratable acidity and water content reached the values seen in VIP-1. During the rainy season there was less accumulation of fructans and the net diurnal carbon gain was lower in both VIP-1 and VIP-2 compared with HP, with VIP-2 showing the lower values. In VIP-1 and VIP-2 there was also a marked reduction in the diurnal accumulation of α-amino-N at both seasons. The data obtained in young developing leaves allowed us to discuss the present data in terms of alterations in the plants sink/source ratio caused by drought and cactus X virus infection. © Oxford University Press Research Papers nationallicence Agave sisalan nationallicence crassulacean acid metabolism nationallicence cactus X virus nationallicence drought nationallicence Izaguirre-Mayoral Maria Luisa Laboratorio de Biotechnologia y Virologia Vegetal, Centro de Microbiologia y Biologia Celular, Instituto Venezolano de Investigaciones Cientificas Apartado postal 21827, Caracas 1020-A, Venezuela aut Marys Edgloris Laboratorio de Biotechnologia y Virologia Vegetal, Centro de Microbiologia y Biologia Celular, Instituto Venezolano de Investigaciones Cientificas Apartado postal 21827, Caracas 1020-A, Venezuela aut Olivares Elizabeth Laboratorio de Ecofisiologia Vegetal, Centro de Ecologia, Instituto de Investigaciones Cientificas Apartado postal 21827, Caracas 1020-A, Venezuela aut Oropeza Tamara Universidad Experimental SimÖn Rodriguez Apartado postal 50297, Sabana Grande, Caracas, Venezuela aut Journal of Experimental Botany Oxford University Press 46/6(1995-06), 639-646 0022-0957 46:6<639 1995 46 exbotj https://doi.org/10.1093/jxb/46.6.639 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.6.639 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Izaguirre-Mayoral Maria Luisa Laboratorio de Biotechnologia y Virologia Vegetal, Centro de Microbiologia y Biologia Celular, Instituto Venezolano de Investigaciones Cientificas Apartado postal 21827, Caracas 1020-A, Venezuela aut NATIONALLICENCE 700 1- Marys Edgloris Laboratorio de Biotechnologia y Virologia Vegetal, Centro de Microbiologia y Biologia Celular, Instituto Venezolano de Investigaciones Cientificas Apartado postal 21827, Caracas 1020-A, Venezuela aut NATIONALLICENCE 700 1- Olivares Elizabeth Laboratorio de Ecofisiologia Vegetal, Centro de Ecologia, Instituto de Investigaciones Cientificas Apartado postal 21827, Caracas 1020-A, Venezuela aut NATIONALLICENCE 700 1- Oropeza Tamara Universidad Experimental SimÖn Rodriguez Apartado postal 50297, Sabana Grande, Caracas, Venezuela aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/6(1995-06), 639-646 0022-0957 46:6<639 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford